VWFAYP Series Butyl Vapor Barrier Tape is an advanced self-adhesive internal sealing tape designed for the interior side of window and door openings in low-energy and high-performance building envelopes. It provides a high vapor-resistance layer to help prevent indoor moisture vapor from diffusing into the wall cavity.
Used together with an exterior vapor-permeable sealing tape, VWFAYP helps create a proper inside-tight / outside-open window installation detail. It improves airtightness around window and door frames, supports condensation control, and helps reduce unwanted energy loss at critical opening transitions.
Product Information
| Product Series | VWFAYP Series |
| Product Type | Butyl vapor barrier tape / internal window sealing tape |
| Material | Butyl |
| Typical Application Style | European low-energy window installation |
| Primary Function | Interior vapor control, airtightness, and condensation-risk reduction |
Available Sizes
| Model | Specification | Package |
|---|---|---|
| VWFAYP-10023 | 0.10 m × 23 m | 6 rolls / ctn |
| VWFAYP-12023 | 0.12 m × 23 m | 5 rolls / ctn |
| VWFAYP-15023 | 0.15 m × 23 m | 4 rolls / ctn |
| VWFAYP-20023 | 0.20 m × 23 m | 3 rolls / ctn |
Key Benefits
Designed for interior-side sealing around windows and doors
Provides high vapor resistance to limit inward moisture diffusion
Improves airtightness around window and door frame transitions
Helps reduce condensation risk in high-performance wall assemblies
Works as the internal sealing layer in European low-energy window installation details
