FRP passive house windows for German projects
Pultruded fiberglass (GFK) window frames for Germany's Passivhaus, Effizienzhaus, and GEG-driven buildings — PHI Component Cert 2491wi03 (U_w 0.78, phB) from the institute that wrote the standard, and outside the EU aluminium anti-dumping duties and CBAM.

Certified where Passivhaus was born — without the aluminium duty stack
Germany invented the Passivhaus standard, and German energy law keeps raising the bar: the GEG 2024 reference building already assumes window Uw 1.3 W/m²·K, BEG funding for window replacement requires Uw ≤ 0.95, and Passivhaus / Effizienzhaus 40 projects push below 0.80. Those targets are won or lost at the frame: thermally broken aluminium struggles to reach them economically, and uPVC gets there only with steel reinforcement that bridges heat and limits sash sizes.
F1 Composite’s pultruded FRP (GFK) fenestration solves the thermal problem in the material itself. The whole frame is intrinsically insulating — fiberglass thermal conductivity ≈ 0.3 W/m·K versus aluminium’s 160 — so our 90-series reaches a whole-window Uw of 0.78 W/m²·K with no thermal break to design, install, or fail. The certificate comes from the source: PHI Component Certificate 2491wi03 (phB class), issued by the Passive House Institute in Darmstadt.
Then there is the cost story German buyers should check before specifying imported aluminium. Chinese aluminium extrusions carry EU anti-dumping duties of 21.2%–32.1% (Regulation (EU) 2021/546), and since January 2026 CBAM prices embedded carbon on imported aluminium and steel building products — aluminium window frames included. Pultruded FRP is a glass-fiber composite, not aluminium or steel, so it sits outside both regimes. Normal EU duty + 19% import VAT are quoted inline DDP — no surprise on landed cost.
German projects choose the supply model: complete factory-glazed, leak-tested window units — including tilt-turn (Dreh-Kipp) configurations — for Passivhaus jobs where airtightness must be guaranteed at the factory, or pultruded profile sets into Germany’s established Fensterbau industry for local assembly. Architectural AAMA 2604 / 2605 powder coating in any RAL color, matching the finish German architects specify on aluminium.
CE / EN 14351-1, GEG, BEG, PHI — the paperwork your spec calls for
| Requirement | German / EU Standard | F1 Performance | Documentation |
|---|---|---|---|
| CE marking | EN 14351-1 (windows & external doors) | Air / water / wind type testing per project | Declaration of Performance |
| Thermal calculation | EN ISO 10077 · DIN 4108 | U_w 0.78 W/m²·K (90-series) | Calculation pack |
| Passive House thermal | PHI Component (Darmstadt) | U_w 0.78, Cert 2491wi03, phB | PHI certificate |
| GEG 2024 compliance | Reference window U_w 1.3 | Clears reference value by 40% | Engineering calculation |
| BEG window funding | Single-measure U_w ≤ 0.95 | 0.78 qualifies with margin | U-value calculation pack |
| Trade-cost exposure | EU AD duties (alu) · CBAM (alu/steel) | FRP outside both regimes | HS 3925.20 / 7019 classification |
| Architectural coating | AAMA 2604 / 2605 · RAL colors | 10-yr exposure, any RAL color | AAMA-listed coater report |
China factory → German jobsite, duty and VAT pre-quoted
RFQ → DDP Germany quote in 24h
Send drawing or section sketch + target quantity + delivery region. F1 returns full DDP pricing (EUR or USD) with EU duty + 19% import VAT itemized, HS classification, and ETA to your jobsite. No aluminium AD duty, no CBAM.
Production 4–6 weeks · cert pack
Pultruded on F1's own lines. PHI Component Certificate 2491wi03, EN ISO 10077 thermal calculation, AAMA-listed coater report, and CE type-testing documentation supplied with the shipment.
Sea freight + DDP delivery
30–35 days to Hamburg / Bremerhaven / Rotterdam. Total PO-to-jobsite 9–13 weeks. DAP inland to Munich, Frankfurt, Berlin, and the Ruhr from the port of entry.
Frequently Asked Questions
Are FRP windows from China subject to EU anti-dumping duties or CBAM?
No. The EU's anti-dumping duties on Chinese aluminium extrusions (Regulation (EU) 2021/546, 21.2%–32.1%) apply to aluminium profiles — so aluminium window systems with Chinese extrusions carry that cost. CBAM, in its definitive regime since January 2026, prices embedded carbon on imported iron/steel and aluminium goods, including aluminium door and window frames (CN 7610) and steel doors and windows (CN 7308 30). Pultruded FRP (fiberglass-reinforced polymer) fenestration is a glass-fiber composite classified under HS 3925.20 / 7019 — outside both the anti-dumping orders and CBAM scope. The normal EU customs duty and 19% German import VAT (Einfuhrumsatzsteuer) still apply and are itemized inline in our DDP Germany quote.
Which German and EU standards do F1 Composite FRP windows follow?
Windows placed on the EU market carry CE marking under EN 14351-1 with a Declaration of Performance — air permeability (EN 12207), watertightness (EN 12208), and wind-load resistance (EN 12210) type testing is arranged per project at an accredited European laboratory such as ift Rosenheim. Thermal performance is calculated to EN ISO 10077, and the frame's Passive House credential is the PHI Component Certificate 2491wi03 (U_w = 0.78 W/m²·K, phB class) issued by the Passive House Institute in Darmstadt — the body that wrote the standard.
Do F1 FRP windows meet GEG 2024, BEG funding, and Passivhaus targets?
Yes, with margin at every tier. The GEG 2024 reference building assumes window U_w 1.3 W/m²·K; BEG single-measure funding for window replacement requires U_w ≤ 0.95; and a PHI-certified component for the cool-temperate climate zone must reach U_w ≤ 0.80. Our 90-series GFRP-PU frame is certified at U_w 0.78 W/m²·K (PHI 2491wi03, phB) — because the entire pultruded frame is intrinsically insulating (≈ 0.3 W/m·K vs aluminium's 160), there is no metallic thermal-break path and no steel reinforcement bridging heat as in uPVC frames.
What are the lead times and shipping options to German jobsites?
Standard schedule from PO: 4–6 weeks production + 30–35 days sea freight to Hamburg, Bremerhaven, or Rotterdam. Total PO-to-jobsite is typically 9–13 weeks DDP. For inland destinations (Munich, Frankfurt, Berlin, the Ruhr) we deliver DAP via truck or rail from the port of entry. Urgent samples or replacement parts ship air freight ex-Shanghai to any major German hub in 4–6 days at premium cost.
Can F1 supply EUR-priced, DDP quotes for German projects?
Yes. We quote DDP to your German jobsite in EUR or USD, with EU customs duty and 19% import VAT itemized so your quantity surveyor sees the full landed cost up front. We classify under HS 3925.20 or 7019 depending on configuration, ship with our EU customs broker handling clearance, and provide full supply-chain traceability documentation with every shipment.
Does F1 supply profiles to German window fabricators, or only finished windows?
Both models run in parallel. For Passivhaus and Effizienzhaus projects that want guaranteed factory airtightness, we ship complete GFRP-PU window units — assembled, glazed, gasketed, and leak-tested, including tilt-turn (Dreh-Kipp) configurations in the 80-series. For Germany's established window-fabrication industry (Fensterbau), we supply the pultruded profile set — frame, sash, mullion, transom, glazing bead — plus co-extruded EPDM gasketing and fabrication drawings, so a German fabricator assembles locally. F1 holds 800+ existing die sections and pultrudes on its own lines (5 bases, 370 lines), so engineered profiles often skip new tooling; finishes are AAMA 2604/2605 architectural powder coating in any RAL color.
PHI-certified GFRP frames (U_w 0.78)
PHI Component Certificate 2491wi03 — what the Darmstadt certification covers and how to specify it.
FRP vs uPVC — stiffness & U-value
Why GFK frames need no steel reinforcement — larger sashes, no hidden thermal bridge.
Zero-carbon community case study
65/90-series GFRP-PU frames across a 13,657 m² zero-carbon dormitory envelope — Wanhua Yantai.
Need FRP passive house windows quoted DDP Germany — outside the aluminium duty stack?
Our engineering team is ready to help you find the right FRP solution. Get in touch for technical consultation or a detailed quotation.