uPVC Windows

uPVC Windows - Energy Efficient, Low Maintenance & Customizable

OKNOPLAST uPVC windows are multi-chamber, steel-reinforced profile systems manufactured in Poland, carrying NFRC certification with U-Factor values ranging from 0.14 to 0.29 BTU/hr·ft²·°F depending on glazing configuration and frame size. The PAVA system serves the U.S. market in three configurations: PAVA (triple-pane, U-Factor 0.14-0.26, for cooler northern regions and high-performance projects), PAVA Light (double-pane, U-Factor from 0.25, lighter sash for moderate and warm climate regions), and PAVA Impact (structurally bonded laminated impact glass, HVHZ Zone 4 certified for Miami-Dade and Broward Counties, Florida Product Approval). The PIXEL system (70 mm / 2¾" profile depth, 6-chamber frame, U-Factor 0.16-0.29) is the fourth option. All systems carry a Design Pressure rating of DP-80. Triple-pane configurations achieve up to 40 dB sound reduction (STC 32-46 / OITC 26-39). The PAVA triple-pane system carries a PHIUS Passive House recommendation for Climate Zones 3-8. Maximum sash height is 102½"; maximum sash width is 56". Lead time to U.S. delivery sites is 8-10 weeks from order confirmation.

What Is a uPVC Window Frame and How Does It Differ from Standard Vinyl?

uPVC - unplasticized polyvinyl chloride - contains no plasticizing additives, maintaining dimensional stability from -13°F to 122°F without the progressive gasket compression loss that raises air infiltration in lower-grade plasticized vinyl frame systems over time. The distinction is measurable at the NFRC label level: Class A uPVC compound profiles per EN 12608 consistently produce lower whole-unit U-Factor values than equivalent-depth extruded plasticized vinyl, because the dimensional stability of the uPVC chamber geometry is retained across thermal cycling - per Lawrence Berkeley National Laboratory window simulation research and NFRC THERM frame modeling methodology.

OKNOPLAST's uPVC profiles carry EN 12608 Class A classification - the highest compound grade for PVC profiles, covering UV resistance, dimensional tolerances, and surface quality. The multi-chamber construction - 7 chambers in the PAVA frame, 6 in the PIXEL - subdivides the frame cross-section into sealed dead-air zones that interrupt conductive heat pathways through the uPVC. Each sealed zone contributes to the frame U-Factor (Uf) component in NFRC whole-unit calculations; this is why the PAVA 7-chamber frame achieves a lower certified U-Factor than a 5-chamber profile of equivalent depth, per NFRC 100 simulation methodology.

All load-bearing chambers in both systems contain factory-pressed galvanized or stainless steel reinforcement inserts. The steel inserts carry structural loads: wind pressure, dead weight of the glazing unit, and hardware operating forces. The uPVC exterior surface and chambers provide the thermal break. This construction is standard for European profiles rated above AAMA Grade R (Residential light-duty) - per AAMA 101/I.S.2/A440 performance standards - and is what makes large-format sash sizes structurally feasible without increasing frame depth.

Both PAVA and PIXEL systems carry the European IFT Quality Mark (ift-zertifiziert, ID 190-6038531-8) - an independent manufacturing and performance audit covering profile dimensional tolerances, hardware durability, and weathertightness. Insulating glass units (IGUs) are CEKAL-certified - the French quality standard for IGU thermal performance, seal longevity, and durability under thermal cycling - providing third-party verification of the glazing unit's performance independent of the frame system.

PAVA, PAVA Light, PAVA Impact, and PIXEL System Specifications

The PAVA system (82 mm / 3¼" frame depth, 7-chamber construction) serves three distinct application scenarios through three glazing configurations: PAVA with triple-pane glazing (NFRC-certified U-Factor 0.14-0.26 BTU/hr·ft²·°F, for cooler northern regions and PHIUS passive house projects), PAVA Light with double-pane glazing (U-Factor from 0.25 BTU/hr·ft²·°F, lighter sash for moderate and warm climate regions and wood-frame construction), and PAVA Impact with structurally bonded laminated impact glass (HVHZ Zone 4 certified, DP-80, for Florida impact applications). The PIXEL system (70 mm / 2¾" frame depth, 6-chamber construction, NFRC-certified U-Factor 0.16-0.29 BTU/hr·ft²·°F) completes the OKNOPLAST uPVC Tilt and Turn range. All four share DP-80 structural rating and the same maximum sash dimensions of 102½" height and 56" width.

PAVA System Specifications - Triple-Pane Configuration

The PAVA system in its triple-pane configuration carries the following NFRC-certified specifications: profile depth 82 mm (3¼"), 7-chamber frame construction with 6-chamber sash, triple glazing (Low-E, argon-filled) as standard, U-Factor range 0.14-0.26 BTU/hr·ft²·°F (SHGC is configuration-dependent - verify NFRC label at time of specification), acoustic rating 32-46 STC / 26-37 OITC, Design Pressure DP-80, maximum sash height 102½", maximum sash width 56". The system includes STV Static/Dry Glazing technology as standard, galvanized or stainless steel reinforcement inserts in all load-bearing chambers, IFT Quality Mark certification (ID 190-6038531-8), CEKAL IGU certification, PHIUS Passive House recommendation for Climate Zones 3-8, and a 10-year product guarantee.

The PAVA triple-pane system achieves U-Factor as low as 0.14 BTU/hr·ft²·°F with an optimized 4/18/4/18/4 configuration using a warm-edge spacer and krypton fill. For high-performance cold-climate applications - Climate Zones 5-8, PHIUS passive house, and near-passive construction - the relevant operating sub-range is approximately 0.14-0.20 BTU/hr·ft²·°F, where the system delivers the thermal performance required for winter comfort and energy efficiency. For standard triple-glazed configurations with argon fill across typical production sash sizes, the range 0.20-0.26 is more representative. This configuration additionally offers broader acoustic isolation potential: with appropriate IGU selection, it reaches STC 40-46 / OITC 34-37 - the highest acoustic rating in the OKNOPLAST uPVC window range.

PAVA Light Specifications - Double-Pane Configuration

The PAVA Light configuration uses the same 82 mm / 3¼" 7-chamber frame and STV Static/Dry Glazing technology as the standard PAVA, but with double-pane glazing instead of triple-pane - producing a lighter sash with U-Factor starting at 0.25 BTU/hr·ft²·°F, with a typical range of approximately 0.25-0.27 depending on glazing specification (SHGC is configuration-dependent - verify NFRC label at time of specification). Design Pressure DP-80, maximum sash height 102½", maximum sash width 56". Acoustic performance reflects double-pane construction - confirm STC / OITC values with NFRC product data at time of specification. IFT Quality Mark certification (ID 190-6038531-8), CEKAL IGU certification, and a 10-year product guarantee apply.

The reduced sash weight of the double-pane configuration is the primary engineering rationale for PAVA Light: triple-pane PAVA sashes at larger formats can exceed the load limits of lighter wood-frame and light-gauge steel framing common in U.S. residential construction - particularly in the South and Southeast where wall sections are thinner and structural loads are specified for lower wind and seismic requirements. Double-pane glazing reduces sash dead weight while maintaining the same profile rigidity and DP-80 structural rating, translating to easier daily operation and reduced long-term stress on hardware, hinges, and frame anchors.

PAVA Light also performs well in high wind exposure zones where structural stability and airtightness are the primary specification criteria rather than minimum U-Factor. The DP-80 structural rating - identical to the triple-pane PAVA - provides the same wind pressure resistance in both configurations. Multi-point Tilt and Turn locking delivers air infiltration below 0.10 CFM/ft² at 25 Pa (ASTM E283) regardless of glazing type, meaning PAVA Light achieves the same envelope airtightness performance as PAVA triple-pane at the frame and hardware level. For projects in coastal and high-wind zones where U-Factor 0.25-0.27 meets code and the priority is structural integrity and airtightness, PAVA Light is the appropriate specification.

PAVA Light is designed for moderate and warmer U.S. climate regions - Climate Zones 1-5 - where U-Factor 0.25-0.27 meets IECC 2021 requirements and where the thermal performance of triple glazing is not required. In Zones 5-6 (max IECC U-Factor 0.27), selected PAVA Light configurations at the lower end of the 0.25-0.27 range may comply; verify with NFRC product label at time of specification. PAVA Light is not specified for Climate Zones 7-8 (Alaska, northern Montana, northern Minnesota), where the IECC 2021 maximum of 0.22 requires the triple-pane PAVA configuration.

PAVA Impact: Florida Product Approval and HVHZ Zone 4 Certification

The PAVA Impact configuration achieves Design Pressure up to 80 psf (DP-80), holds Florida Product Approval (FPA) and HVHZ Zone 4 certification for Miami-Dade and Broward Counties under the Florida Building Code, and is the only OKNOPLAST uPVC system tested per TAS 201 (large missile impact), TAS 202 (uniform static air pressure), and TAS 203 (cyclic wind pressure loading). It is OKNOPLAST's uPVC Tilt and Turn product for HVHZ applications and for any Florida project where impact-rated fenestration is required by local wind zone or insurance mandates.

PAVA Impact uses structurally bonded laminated impact glass - a unit of three physical glass sheets and one sealed air cavity. The outer layer is a laminated glass pane (two sheets bonded with a PVB interlayer) that forms the impact-resistant "third pane"; paired with a standard inner pane across the single sealed air space, the assembly is thermally classified as double-glazed, explaining the U-Factor measurements referenced with double glazing in OKNOPLAST product data. The structural bonding via STV dry-glazing technology transfers wind load directly through the glass-sash composite assembly to the frame and anchorage, achieving Design Pressure up to 80 psf (DP-80). The unit meets TAS 201 (large missile impact), TAS 202 (uniform static air pressure), and TAS 203 (cyclic wind pressure loading) testing requirements for HVHZ product approval.

PAVA Impact specifications (per OKNOPLAST product data): fixed single sash maximum 60" × 120"; operable Tilt and Turn sash maximum 41" × 96"; coupling mullions up to 120" length at DP-80; integrated mullions up to 96". U-Factor from 0.24 BTU/hr·ft²·°F (fixed) and from 0.25 BTU/hr·ft²·°F (Tilt and Turn) with double glazing - NFRC-certified. SHGC from 0.20 (fixed) and from 0.17 (Tilt and Turn). Acoustic rating STC 42 / OITC 34. Triple gasket system provides water tightness up to 12 psf. Installation methods available: nailing fin, fixing clips, or direct bolt. Available in 50+ color options.

The operable Tilt and Turn sash, at a maximum of 41" × 96", is more constrained than the standard PAVA system maximum of 56" × 102½" (width × height), because the laminated impact glass carries substantially higher dead weight than a standard IGU and the HVHZ certification is tested at this specific sash geometry. Fixed configurations up to 60" × 120" are available where Tilt and Turn operation is not required. Florida Product Approval number is not published in this document - contact your authorized OKNOPLAST dealer for current FPA documentation and project-specific compliance verification.

PIXEL System Specifications

The PIXEL system carries the following NFRC-certified specifications: profile depth 70 mm (2¾"), 6-chamber frame construction, standard triple glazing (Low-E, argon-filled), U-Factor range 0.16-0.29 BTU/hr·ft²·°F (SHGC is configuration-dependent - verify NFRC label at time of specification), acoustic rating 32-46 STC / 26-39 OITC, Design Pressure DP-80, maximum sash height 102½", maximum sash width 56". The system includes bent-steel reinforcement inserts in all load-bearing chambers, ADA Standards compliance, IFT Quality Mark certification (ID 190-6038531-8), CEKAL IGU certification, and a 10-year product guarantee.

The PIXEL system's 6-chamber profile with bent-steel reinforcement delivers a 33% narrower movable mullion compared to standard Tilt and Turn profiles of equivalent structural grade - a consequence of the steel insert carrying load that would otherwise require additional profile mass. PIXEL is the specified system for ADA-compliant hardware configurations and for projects where narrow sight lines are a design requirement.

How Does Tilt and Turn Operation Achieve Sub-0.10 CFM/ft² Air Infiltration Rates?

Tilt and Turn windows achieve air infiltration rates below 0.10 CFM/ft² at 25 Pa (ASTM E283) - compared to 0.30-0.50 CFM/ft² for most double-hung replacements tested under the same protocol - because the operating mechanism engages 3 to 5 compression points simultaneously around the sash perimeter rather than a single latch at the center rail.

The mechanism operates through three handle positions. In the locked position, the multi-point gear system simultaneously actuates shoot bolts, hooks, and compression rollers distributed around the sash perimeter, drawing the sash uniformly against the EPDM perimeter gasket. In the tilt position (handle rotated 90°), the sash opens from the top on a horizontal axis - the tilt opening width is mechanically limited to 4-6 inches, providing ventilation while maintaining full perimeter lock engagement at the bottom and sides, with no exterior forced-entry gap. In the turn position (handle rotated 180°), the sash swings fully inward on a vertical axis, providing full-width access for cleaning and egress.

The performance differential against double-hung and single-hung windows is structural. A single latch at the center rail of a single-hung sash cannot apply uniform compression against a perimeter gasket; thermal cycling causes the sash to expand and contract non-uniformly, and a single-point lock cannot compensate at the perimeter. A 5-point multi-point locking system compensates for minor sash deformation at each lock point independently. Per AAMA 101/I.S.2/A440 performance data and field measurement records on high-performance retrofit projects, multi-point Tilt and Turn systems properly adjusted at installation sustain air leakage below 0.10 CFM/ft² at 25 Pa (ASTM E283) across the product service life, provided hardware is inspected at 5-7-year intervals.

The practical consequence for building envelope performance: in a 2,500 ft² house in Climate Zone 5 with 20 windows of average 12 ft² each, the difference between 0.10 CFM/ft² (Tilt and Turn) and 0.40 CFM/ft² (single-hung replacement) represents approximately 72 CFM of additional air leakage at design pressure - a continuous heating or cooling load that HVAC systems must condition across the full heating and cooling season.

What Is STV Dry Glazing Technology and Why Does It Enable Larger Sash Formats?

The PAVA system's STV (Static/Dry Glazing) technology - standard in PAVA, PAVA Light, and PAVA Impact - bonds the insulating glass unit to the sash through a dry gasket rather than wet-set glazing compound or structural silicone, enabling sash widths up to 56 inches at an 82 mm profile depth, compared to the 90-100 mm frame depth conventional wet-set uPVC systems require to achieve equivalent structural rigidity in the same format.

In a conventional wet-set glazed window, the frame carries all wind load and dead weight; the glass unit sits in a channel with a flexible bed compound that absorbs thermal movement independently. At large formats (sash widths above 36"), the frame alone must be deep and heavily reinforced to prevent deflection under design wind pressure - which is the structural basis for the profile depth inflation that affects most conventional uPVC Tilt and Turn systems in large-format configurations.

With STV, the glass unit - inherently a high-rigidity material, with flexural modulus orders of magnitude higher than uPVC - assumes a direct share of structural load. The sash becomes a composite assembly: galvanized steel reinforcement, uPVC chambers, and glass unit acting together as a single structural element. The PAVA system at 82 mm achieves structural rigidity equivalent to conventional systems at 90-100 mm, per OKNOPLAST's ift-certified testing under EN 12210 (wind load resistance) and EN 12211 (deflection) protocols.

The second consequence is long-term seal stability. In wet-set glazing, the bedding compound between glass unit and sash can compress unevenly over years of thermal cycling, creating irregular pathways for air infiltration along the glass-to-sash interface. The STV dry gasket maintains consistent compression geometry independent of compound aging. Passive House builders in Climate Zones 5 and 6 who have specified STV-based systems consistently report that the primary rationale - beyond the U-Factor at installation - is performance stability: the system certified at U-Factor 0.20 at installation needs to hold close to that value after 10-15 years of freeze-thaw cycling in Chicago, Minneapolis, or Albany.

How Does Triple Glazing with Argon Fill Achieve 40 dB Sound Reduction in uPVC Windows?

OKNOPLAST uPVC triple-pane windows achieve up to 40 dB sound reduction - STC 32-46 / OITC 26-39 across the tested range per OKNOPLAST product data - because two independent argon-filled air cavities in a triple-pane IGU force sound waves to shed energy across two distinct acoustic barriers, compared to one in a double-pane assembly.

The Acoustic Mechanism: Two Cavities, Argon Gas, and Asymmetric Spacing

Triple glazing creates two independent argon-filled air spaces, and that sequential cavity structure is what drives the noise reduction differential over double-pane. Each cavity functions as an independent acoustic barrier: sound waves must shed energy twice before reaching the interior surface. Argon has approximately 34% lower thermal conductivity than air, which reduces center-of-glass heat transfer in the IGU. Argon is also approximately 38% denser than air - a higher molecular weight gas that increases the acoustic mass of each sealed cavity and attenuates sound transmission more effectively than an air-filled equivalent. Asymmetric pane spacing within the triple-pane IGU further disrupts the mass-air-mass resonance that undermines conventional double-pane configurations at mid-frequency ranges - typically the 500-2,000 Hz band where traffic and HVAC noise are concentrated.

Multi-chamber uPVC profiles decouple the IGU from the building structure, blocking flanking transmission - the acoustic pathway where sound bypasses the glass entirely and travels through the frame-to-wall junction instead. In a single-chamber or thin-wall frame, the structural connection between glazing and wall is direct; in a 6- or 7-chamber uPVC profile with steel reinforcement, the multi-layer chamber geometry interrupts the conductive acoustic path at the frame level.

Tilt-Position Seal Integrity and Its Acoustic Consequence

At infiltration rates of 0.10 CFM/ft² or below (ASTM E283) - achievable with Tilt and Turn multi-point locking - the gap-transmitted sound contribution is negligible, because the same perimeter compression that seals against air simultaneously eliminates the primary acoustic leakage pathway through the sash-to-frame interface. Closing the sash-to-frame gap at all lock points simultaneously addresses both the primary entry route for air infiltration and one of the most overlooked pathways for sound penetration in standard window assemblies.

For urban environments - dense residential in NJ, NY, and PA; mixed-use projects adjacent to transit corridors or expressways - the PAVA system triple-pane configuration with STV glazing and PHIUS-level airtightness (envelope ≤ 0.05-0.08 CFM50/ft²) delivers the rated 40 dB / STC 46 performance level within a single product that simultaneously meets NFRC-certified U-Factor targets.

Acoustic Performance by Glazing Configuration

Double-pane Low-E argon configurations - including PAVA Light - achieve noise reduction below 40 dB (STC 32-38 / OITC 26-32), appropriate for South-Central and Southern zones where ambient noise levels are lower and triple-pane acoustic performance is not required. Standard triple-pane argon configurations reach up to 40 dB (STC 38-46 / OITC 32-39), the applicable specification for Northern and North-Central zones and urban projects. The PAVA triple-pane system with Low-E argon and STV dry glazing achieves up to 40 dB with PHIUS-level airtightness (STC 40-46 / OITC 34-37), making it the specification for passive house, net-zero, and high-density urban residential projects where energy and acoustic targets must be met simultaneously.

IECC 2021, ENERGY STAR, and PHIUS Compliance: Which U-Factor Thresholds Apply?

OKNOPLAST uPVC windows comply with IECC 2021 Table R402.1.2 U-Factor requirements as follows: the PAVA triple-pane system (0.14-0.26) and the PAVA Light double-pane system (0.25-0.27) comply for Climate Zones 1-5; the PIXEL system (0.16-0.29) complies for Zones 1-4 across its full range, with Zone 5-6 requiring NFRC unit-level verification; only PAVA triple-pane reaches Zone 7-8 (U-Factor ≤ 0.22) in configurations within the 0.14-0.21 sub-range - verified by NFRC-certified unit-level values at time of specification.

IECC 2021 Table R402.1.2 - Maximum U-Factor by Climate Zone

The PAVA triple-pane system (U-Factor 0.14-0.26) complies with the maximum U-Factor of 0.40 in Climate Zones 1-2, 0.30 in Zones 3-4, 0.27 in Zones 5-6, and - in optimized configurations within the 0.14-0.21 sub-range - 0.22 in Zones 7-8 (Alaska, northern Montana, northern Minnesota). The PAVA Light double-pane system (U-Factor from 0.25, typical range 0.25-0.27) complies with Climate Zones 1-2 (max 0.40) and Zones 3-4 (max 0.30); in Zones 5-6 (max 0.27), selected PAVA Light configurations at the lower end of the range may comply - verify NFRC-certified unit-level values at time of specification. PAVA Light does not reach the Zone 7-8 maximum of 0.22. The PIXEL system (U-Factor 0.16-0.29) complies across its full range for Zones 1-4; Zone 5-6 compliance requires NFRC unit-level verification. For Climate Zones 7-8, only the PAVA triple-pane system in optimized configurations achieves the required U-Factor ≤ 0.22.

Note: individual states adopt specific IECC vintages - some jurisdictions reference IECC 2018. Confirm the adopted code year with the local Authority Having Jurisdiction (AHJ). For jurisdictions referencing the IRC directly, IRC Section N1102.5 establishes NFRC certification as the compliance mechanism for residential fenestration - NFRC-labeled products provide the verified U-Factor and SHGC data required by inspectors under IRC Table N1102.1.

ENERGY STAR 2025 - U-Factor Thresholds by Climate Zone

ENERGY STAR 2025 sets maximum U-Factor thresholds of 0.27 (Northern zone), 0.28 (North-Central), 0.30 (South-Central), and 0.32 (Southern) - all within the PAVA triple-pane system's 0.14-0.26 certified range. The PAVA Light double-pane system (U-Factor from 0.25, typical range 0.25-0.27) falls within Southern (≤ 0.32) and South-Central (≤ 0.30) thresholds across its full range; for North-Central (≤ 0.28) and Northern (≤ 0.27) zone compliance, PAVA Light configurations at the lower end of the range may qualify - verify NFRC unit-level values. In the Northern zone there is no SHGC requirement; in North-Central the SHGC maximum is 0.40; in South-Central and Southern the SHGC maximum is 0.25. The PIXEL system (U-Factor 0.16-0.29) falls within South-Central and Southern thresholds across its full range; for Northern and North-Central compliance, NFRC unit-level verification is required.

ENERGY STAR certification for the PAVA and PIXEL systems has been submitted to the EPA and is currently pending approval. Verify current certification status at energystar.gov before specifying for projects requiring ENERGY STAR compliance.

PHIUS 2021+ Requirements

PHIUS 2021+ specifies peak heating and cooling loads per unit floor area (≤ 4.75 kBTU/ft²·yr heating, ≤ 3.17 kBTU/ft²·yr cooling in mixed climates), total source energy use (≤ 38 kBTU/ft²·yr), and building envelope airtightness (≤ 0.05-0.08 CFM50/ft² of envelope), per PHIUS 2021 Standard documentation. Window U-Factor requirements for PHIUS compliance vary by climate zone, orientation, and window-to-wall ratio; in heating-dominated zones (IECC 5-8), the practical threshold is U-Factor ≤ 0.14-0.20 BTU/hr·ft²·°F - per PHIUS project modeling guidance and LBNL Building Technologies Office fenestration research.

The PAVA triple-pane system - with NFRC-certified U-Factor as low as 0.14 and explicit PHIUS recommendation - is the specified system for PHIUS 2021+ projects in Climate Zones 3-8. The PIXEL system reaches PHIUS-compatible thresholds in Zones 3-6 with glazing configurations in the 0.16-0.20 sub-range. PAVA Light, with U-Factor from 0.25, does not meet PHIUS 2021+ thresholds for heating-dominated zones - specify PAVA triple-pane for all passive house and near-passive applications.

The common assumption among U.S. architects is that uPVC Tilt and Turn systems are exclusively a cold-climate specification - justified in Climate Zones 5-8 by the U-Factor advantage. The SHGC management benefit in South-Central markets is underestimated: at SHGC ≤ 0.25 and U-Factor ≤ 0.30, both achievable across the PAVA and PIXEL systems, the same profile that prevents heat loss in Minneapolis prevents solar gain overload in Nashville or Charlotte - without the thermal bridging penalty that aluminum-frame alternatives carry in those mixed climates.

Which Building Types, Climate Zones, and Project Standards Call for uPVC Tilt and Turn Windows?

uPVC Tilt and Turn windows are specified when the project requires NFRC-certified U-Factor performance below 0.30 (IECC 2021 Table R402.1.2 threshold for Zones 3-6), multi-point air infiltration control below 0.10 CFM/ft² at 25 Pa (ASTM E283), or dual-function sash operation in residential and light commercial settings.

High-performance residential retrofit - Climate Zones 4-7: The dominant specification context in the Northeast U.S. (NJ, NY, PA, MA) is the gut renovation of 1960s-1990s wood-frame or brick-veneer houses where existing single-glazed or double-glazed aluminum sashes are replaced. These projects face two constraints: non-standard rough opening dimensions (requiring made-to-measure units) and state energy code compliance (IECC 2018 or 2021 Table R402.1.2, U-Factor ≤ 0.27 in Climate Zones 5-6). OKNOPLAST uPVC Tilt and Turn units - made-to-order to millimeter tolerances - satisfy both constraints simultaneously. The 8-10 week lead time requires inclusion in the project schedule; rough opening preparation and framing should be complete before the production order is submitted.

Passive House and PHIUS certification projects: Projects targeting PHIUS 2021+ certification require envelope airtightness ≤ 0.05-0.08 CFM50/ft² - a threshold that cannot be achieved with standard U.S. single-hung or casement windows at their typical air leakage rates of 0.30-0.50 CFM/ft² at 25 Pa (ASTM E283). The PAVA system's PHIUS recommendation positions it as the applicable uPVC specification for PHIUS projects in Climate Zones 3-8. The acoustic performance - up to 40 dB / STC 46 - makes this combination well-suited to urban PHIUS multifamily projects where both energy and acoustic targets must be met under a single fenestration specification.

Mid-rise multifamily new construction - Climate Zones 4-6: For wood-frame or light-gauge steel mid-rise, uPVC Tilt and Turn systems deliver AAMA-equivalent structural grading, NFRC-certified U-Factor performance, and maintenance-free uPVC exterior finish that specification architects require for envelope durability over a 30-50 year building service life. OKNOPLAST's uPVC brickmould - available in a 4-sided configuration or a 3-sided configuration with sill, with frame depth options from 1⅛" to 4¼" - eliminates the field-fabricated trim detail that commonly introduces air infiltration pathways at the rough opening perimeter.

Florida new construction: OKNOPLAST offers two PAVA configurations for Florida. PAVA Impact - the PAVA system configured with structurally bonded laminated impact glass - holds Florida Product Approval (FPA) and HVHZ Zone 4 certification for Miami-Dade and Broward Counties. Fixed sash configurations reach 60" × 120"; operable Tilt and Turn sash reaches 41" × 96" at DP-80; U-Factor from 0.24 (fixed) / from 0.25 (Tilt and Turn) with double glazing, NFRC-certified; STC 42 / OITC 34. For Florida projects outside HVHZ, PAVA Light and PIXEL - both with DP-80 - provide adequate wind pressure resistance and full IECC compliance across all Florida climate zones. Contact your authorized OKNOPLAST dealer for Florida Product Approval documentation and project-specific configuration guidance.

Specification Decision by Climate Zone

In Climate Zones 1-3 (Florida, Texas, California coastal, Southeast, Mid-Atlantic moderate areas), PAVA Light and PIXEL are the primary specifications - both comply with IECC U-Factor requirements, and PAVA Light's lighter sash is an advantage in the wood-frame construction prevalent in these regions. Specify PAVA triple-pane in Zones 1-3 when PHIUS certification, STC ≥ 45 acoustic performance, or the lower U-Factor of triple glazing is required for premium projects.

In Climate Zones 4-5 (Virginia, North Carolina, Tennessee, Colorado, Pennsylvania, New Jersey, New York metro), PAVA Light and PIXEL are applicable for projects where U-Factor 0.25-0.27 meets code and comfort requirements. Specify PAVA triple-pane in Zones 4-5 when PHIUS, U-Factor ≤ 0.22, or passive house standards are required, or when the project's construction type accommodates the heavier triple-pane sash.

In Climate Zones 6-8 (Minnesota, Wisconsin, upstate New York, Montana, Alaska), PAVA triple-pane is the standard specification. Zone 7-8 IECC compliance requires U-Factor ≤ 0.22, achievable only with PAVA in optimized triple-pane configurations (warm-edge spacer, krypton fill). PAVA Light does not reach Zone 7-8 compliance and is not specified for these zones. For extreme cold climates such as Alaska (Zone 8), where energy requirements exceed the range that standard PAVA triple-pane configurations address, more advanced glazing solutions are required - consult your authorized OKNOPLAST dealer for project-specific guidance on the optimal system.

Lead Time, Production, and Logistics for U.S. Projects

OKNOPLAST uPVC windows manufactured to U.S. project specifications carry an 8-10 week lead time from confirmed order to delivery on U.S. soil: approximately 4-5 weeks in production at the facility in Poland, plus 4-5 weeks ocean freight and U.S. customs clearance. This lead time is consistent across all PAVA configurations and the PIXEL system, and across all standard and custom color configurations within the profile size range. Installation and order coordination is handled by your authorized OKNOPLAST dealer, who can provide rough opening preparation schedules, shop drawings, and installation support.

Production capacity across OKNOPLAST's manufacturing operations in Poland is 2.3 million units per year. All systems carry a 10-year product guarantee. ISO 14001 environmental management certification covers the full production operation.

Color Foil Technology, Custom Shapes, and Glazing Options

OKNOPLAST uPVC systems are available in 50+ exterior color options - including anthracite grey (RAL 7016), black (RAL 9005), white (RAL 9003), dark brown, golden oak, and custom RAL shades - in co-extruded co-polymer color foils factory-bonded to the exterior profile surface during the extrusion process. This manufacturing method eliminates UV fading, paint delamination, and surface adhesion failure typical of post-production coatings applied to uPVC. Interior surface options include standard white and wood-grain laminates. For Southern and coastal U.S. climates with elevated UV and salt-air exposure, aluminum cladding is available as an outer shell over the uPVC frame exterior, adding targeted corrosion resistance without affecting the thermal or structural performance of the window assembly.

Both systems accept custom non-rectangular shapes - arched, round, and trapezoidal - fabricated to specification, eliminating custom field fabrication for non-standard architectural openings. Warm-Edge glass spacers are available in black, brown, white, or silver - a specification detail relevant when a minimal visible sight line between glass and frame is a design criterion.

Glass selection options include standard triple-pane Low-E, solar-control Low-E (SHGC ≤ 0.25 for South-Central and Southern zone compliance), and ornamental glass for privacy applications in bathrooms, entryways, and façade areas where decorative patterning is a design requirement. Solar-control Low-E coatings selectively block near-infrared solar radiation while preserving visible light transmittance - reducing cooling loads without reducing daylighting, which is the mechanism behind SHGC ≤ 0.25 compliance in warm and mixed climates.

The optional effi AIR continuous ventilation system integrates into the frame of PAVA and PIXEL windows, providing passive fresh-air exchange at a controlled flow rate without opening the sash - specified in projects where PHIUS or ASHRAE 62.2 mechanical ventilation requirements intersect with occupant preference for non-operable fresh-air supply.

How to Maintain uPVC Tilt and Turn Windows for Long-Term Performance

OKNOPLAST uPVC windows require four annual maintenance operations - frame cleaning, multi-point hardware lubrication, perimeter gasket inspection, and drainage channel clearing - with no painting, staining, or surface recoating needed across the 10-year guaranteed service period. Factory co-extruded UV-resistant color foils hold their finish under direct sun without routine recoating under normal service conditions; the uPVC compound's plasticizer-free formulation resists rot, rust, and biological degradation that require ongoing treatment on wood and uncoated aluminum frames.

1. Frame cleaning - twice per year: Wipe down uPVC frames with a soft cloth, mild soap, and warm water. More frequent cleaning is appropriate after heavy salt, pollen, or construction dust exposure in coastal and Southern climates. Avoid abrasive cleaners and scouring pads - surface scratches compromise the factory foil finish and are not covered under the product guarantee.

2. Multi-point hardware lubrication - annually: Apply light machine oil or a manufacturer-specified lubricant to all moving components: hinges, multi-point locking points, shoot bolt guides, and handle mechanisms. This preserves the distributed clamping force around the sash perimeter that produces sub-0.10 CFM/ft² air leakage performance (ASTM E283). Stiff or seized locking points reduce uniform gasket compression and raise field infiltration above the NFRC-certified label value.

3. Perimeter gasket inspection - annually: Inspect EPDM perimeter gaskets for compression loss, cracking, or surface deformation. Deteriorated gaskets increase air infiltration at the sash-to-frame interface and degrade field U-Factor performance below the NFRC-certified rating. Replacement gaskets are available and field-replaceable without sash removal.

4. Drainage channel clearing - annually: Clear debris from the frame sill drainage channels with a soft brush or compressed air. Blocked channels allow standing water to accumulate at the sill, accelerating gasket and hardware wear and raising the risk of moisture infiltration at the frame-to-sash interface.

Seasonal hardware adjustment: Temperature differentials between summer and winter cause minor dimensional shifts in both the uPVC frame and sash. Recalibrating the locking point engagement each season - a simple field adjustment requiring a hex key - maintains consistent perimeter gasket compression across freeze-thaw cycles and extends the service life of both hardware and gasket.

Coastal installations: For homes within 5 miles of saltwater, aluminum cladding on the exterior uPVC profile face provides a corrosion-resistant barrier against chloride-accelerated surface degradation, without any periodic treatment requirement.

FAQ

What is the U-Factor of OKNOPLAST uPVC windows?

The PAVA triple-pane system carries an NFRC-certified U-Factor range of 0.14-0.26 BTU/hr·ft²·°F; for high-performance cold-climate applications (Climate Zones 5-8, PHIUS), the relevant operating sub-range is approximately 0.14-0.20. The PAVA Light double-pane system carries U-Factor starting at 0.25 BTU/hr·ft²·°F, with a typical range of approximately 0.25-0.27. The PIXEL system carries an NFRC-certified range of 0.16-0.29 BTU/hr·ft²·°F. Verify unit-level values with the NFRC product label at time of specification.

Is OKNOPLAST pursuing ENERGY STAR certification for uPVC windows?

ENERGY STAR certification for the PAVA and PIXEL systems has been submitted to the EPA and is currently pending approval. Verify current certification status at energystar.gov before specifying for projects with ENERGY STAR compliance requirements. The PAVA triple-pane system (U-Factor 0.14-0.26) falls within ENERGY STAR thresholds for all four U.S. climate zones; PAVA Light (0.25-0.27) covers Southern and South-Central zones across its full range, with Northern and North-Central compliance requiring NFRC unit-level verification; PIXEL (0.16-0.29) covers South-Central and Southern zones across its full range, with Northern and North-Central requiring verification.

What is the difference between PAVA, PAVA Light, PAVA Impact, and PIXEL?

The PAVA system uses the same 82 mm / 3¼" 7-chamber frame in three glazing configurations. PAVA (triple-pane): U-Factor 0.14-0.26, PHIUS-recommended, for cooler northern regions (Climate Zones 5-8) and passive house projects. PAVA Light (double-pane): U-Factor from 0.25 (typically 0.25-0.27), lighter sash, for moderate and warm climate regions (Zones 1-5) and wood-frame construction where triple-pane sash weight is a concern - not for Zones 7-8 or Alaska. PAVA Impact (triple-pane laminated): DP-80, HVHZ Zone 4 FPA, for Florida impact applications. PIXEL: 70 mm (2¾") 6-chamber frame, U-Factor 0.16-0.29, DP-80, ADA compliant, narrower sight lines - for slim-profile aesthetic specifications or ADA-required hardware configurations.

Does OKNOPLAST offer HVHZ-certified windows for Miami-Dade and Broward Counties?

Yes - PAVA Impact carries Design Pressure up to 80 psf (DP-80) with Florida Product Approval (FPA) and HVHZ Zone 4 certification for Miami-Dade and Broward Counties. The PAVA Impact configuration - PAVA WITH STRUCTURALLY BONDED LAMINATED IMPACT GLASS - is tested per TAS 201 (large missile impact), TAS 202 (uniform static air pressure), and TAS 203 (cyclic wind pressure loading). Fixed single sash configurations are available up to 60" × 120"; operable Tilt and Turn sash up to 41" × 96". U-Factor from 0.24 BTU/hr·ft²·°F (fixed) and from 0.25 BTU/hr·ft²·°F (Tilt and Turn) with triple glazing, NFRC-certified; SHGC from 0.20 (fixed) and from 0.17 (Tilt and Turn); STC 42 / OITC 34. Florida Product Approval number is not published in this document - contact your authorized OKNOPLAST dealer for current FPA documentation.

What is the air infiltration rate of Tilt and Turn uPVC windows?

Tilt and Turn windows with multi-point locking achieve air infiltration below 0.10 CFM/ft² at 25 Pa (ASTM E283) - compared to 0.30-0.50 CFM/ft² for most double-hung replacements under the same protocol. The 3-to-5-point multi-point system engages all lock points simultaneously, maintaining uniform gasket compression under thermal cycling. Per AAMA performance data and field records on high-performance projects, this level is sustained across the service life, provided hardware is inspected at 5-7-year intervals.

Are OKNOPLAST uPVC windows compliant with IECC 2021?

The PAVA triple-pane system (U-Factor 0.14-0.26) and PAVA Light double-pane system (U-Factor 0.25-0.27) comply with IECC 2021 Table R402.1.2 for Climate Zones 1-5. PIXEL (0.16-0.29) complies across its full range for Zones 1-4; Zone 5-6 requires NFRC unit-level verification. Zone 7-8 (U-Factor ≤ 0.22) requires PAVA triple-pane configurations within the 0.14-0.21 sub-range. Confirm the adopted IECC vintage with the local AHJ - individual states may reference IECC 2018. For commercial projects referencing ASHRAE 90.1, verify U-Factor and SHGC requirements by climate zone with the project energy engineer.

What noise reduction do OKNOPLAST uPVC windows achieve?

OKNOPLAST uPVC triple-pane windows achieve up to 40 dB sound reduction - STC 32-46 / OITC 26-39 depending on glazing configuration per OKNOPLAST product data. The two independent argon-filled cavities in a triple-pane IGU function as sequential acoustic barriers, and the multi-chamber uPVC profile blocks flanking transmission through the frame-to-wall junction. The PAVA system reaches STC 46 / OITC 37 at the top of its tested range.

What is the lead time for OKNOPLAST uPVC windows in the U.S.?

Lead time is 8-10 weeks from confirmed order to U.S. delivery: 4-5 weeks production at the facility in Poland and 4-5 weeks ocean freight and customs clearance. All units are made-to-order to millimeter-precise specifications. Contact your authorized OKNOPLAST dealer for order coordination and project scheduling.

Do OKNOPLAST uPVC windows meet PHIUS passive house requirements?

The PAVA system carries explicit PHIUS recommendation. PHIUS 2021+ projects in Climate Zones 5-8 typically require U-Factor ≤ 0.14-0.20 BTU/hr·ft²·°F - within PAVA's certified range of 0.14-0.26. PHIUS requires building envelope airtightness ≤ 0.05-0.08 CFM50/ft² of envelope; the Tilt and Turn multi-point mechanism achieves sub-0.10 CFM/ft² air leakage (ASTM E283), contributing to PHIUS envelope airtightness targets. Confirm glazing configuration U-Factor values with NFRC-certified data at time of window schedule development.

Can OKNOPLAST uPVC windows be specified for multifamily or light commercial projects?

Both PAVA and PIXEL carry structural grading equivalent to AAMA Residential to Light Commercial grade and are specified in wood-frame mid-rise and multifamily projects in Climate Zones 4-6. Maximum sash dimensions are 102½" height and 56" width. For projects requiring ASHRAE 90.1 compliance or curtainwall integration, OKNOPLAST's aluminum MIRU EVO Storefront system is the applicable specification.

What maintenance do uPVC Tilt and Turn windows require?

OKNOPLAST uPVC windows require four annual maintenance operations - frame cleaning, multi-point hardware lubrication, perimeter gasket inspection, and drainage channel clearing - with no painting, staining, or surface recoating needed across the 10-year guaranteed service period. Seasonal recalibration of multi-point lock engagement preserves gasket compression across freeze-thaw cycles.