The "Weakest Link" in Your Wall: Why Passive Windows Cannot Be Mounted Directly on Concrete
We see this mistake on job sites every day: A contractor buys expensive triple-glazed windows but mounts them directly onto the concrete opening. The result? A massive thermal bridge that ruins the building's energy rating. At Hebei Woqin, we solve this paradox. Our Ultra-High-Density Graphite Sub-frames (2090 kPa) act as a "Structural Thermal Break"—strong enough to hold heavy screws, yet insulating enough to stop energy leaks dead in their tracks.
The Core Problem: Why You Need a "Hard" Insulation Layer Let’s go back to basics. Why can't you just bolt a window to the masonry or concrete?
1.The Physics: Concrete and steel are "Thermal Highways." If you attach a window directly to them, heat bypasses your expensive glass and escapes through the frame. This is a Thermal Bridge.
2.The Dilemma: You need something to block this heat (Insulation), but standard insulation is too soft to hold screws. And wood? It rots and conducts heat too easily.
3.The Solution: You need a material that is Strong like a brick (to hold the window) but Insulates like foam (to stop the heat). That is exactly what our Graphite EPS Sub-frame does.
2090 kPa: The "Concrete" of Foams Don't let the word "EPS" fool you. This isn't packaging foam. Hebei Woqin’s Graphite Sub-frame is engineered for structural load-bearing:
1.Compressive Strength: At 2090 kPa, it can support the immense weight of triple-glazed units without deforming.
2.Screw Retention: With a pulling force of 2130 N, it grips bolts tightly, ensuring your heavy windows stay perfectly balanced and airtight for decades.
3.PHI Ready: Designed to meet the strict "Thermal Bridge Free" criteria of the Passive House Institute, ensuring your linear thermal transmittance (Ψ-value) stays minimal.
Preventing the "Black Mold" Nightmare In a high-performance home, a thermal bridge isn't just about energy bills; it's about health. A cold window frame creates Condensation. Condensation leads to Black Mold. By using our Graphite Sub-frame, you keep the internal surface temperature above the dew point. No cold spots = No condensation = A healthy, mold-free home for the family. For architects, this means peace of mind. For contractors, it means no callbacks or lawsuits.
Don't Ship "Air": The Kitting Strategy We know that shipping EPS profiles can be expensive due to volume. The Smart Procurement Hack: Include these Sub-frames as part of a "Passive House Kit".
1.Base Load: Heavy Rock Wool or Glass Wool pallets.
2.Top Load: Lightweight Graphite Sub-frames and Thermal Break Anchors. By mixing densities, we optimize the container's weight-to-volume ratio, effectively shipping these high-tech profiles for "free" (using the empty space of a heavy container).
🏭 Engineer Your Window Junctions Stop thermal bridges. Start structural insulation.
Company: Hebei Woqin Trading Co., Ltd.
WhatsApp/WeChat: +86 13933929092
Email: an@cn-aerogel.com
Service: Custom Profile Cutting | Structural Calculation Support | Mixed Loading
Written by - Zhongjian An
Certified Passive House Designer (PHI Germany), validated by Prof. Dr. Wolfgang Feist. With 15+ years of expertise in high-performance solutions for both Green Buildings and Industrial Applications (Petrochemical Pipelines, LNG Cryogenic, & High-Temp Equipment).
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