How to Seal Windows for Passive House Standards
By DIY Eco Homes | Published: 6/16/2025
Learn how to effectively seal windows to meet Passive House standards and significantly reduce energy loss in your home.
How to Seal Windows for Passive House Standards Want to save up to 90% on heating and cooling energy? Properly sealing your windows is key to meeting Passive House standards. Here's how: - Why Seal Windows? Windows are major culprits for energy loss - up to 30% of a home's heating energy escapes through them. Proper sealing improves airtightness, reduces heat loss, prevents moisture issues, and enhances indoor comfort. - Passive House Requirements: Buildings must achieve less than 0.6 air changes per hour (ACH50) during a pressure test at 50 Pascals. - Common Window Leak Areas: Gaps at the frame-to-wall connection, damaged caulking, or poor insulation around the rough opening. - Best Sealing Materials: - Acrylic Tapes: Durable and weather-resistant. - Liquid Membranes: Great for complex shapes. - Specialized Caulks: Ideal for small gaps and details. - Step-by-Step Process: 1. Inspect and clean the window opening. 2. Fill gaps with caulk, foam, or backer rods. 3. Apply airtight tapes or...
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