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.
For improved installation flexibility, VWFAYP can be supplied with customized split release film configurations. A narrow self-adhesive strip on the reverse side can also be added upon request, allowing easier pre-fixing to window or door frames before final bonding to the surrounding internal wall substrate.
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 |
| Optional Configuration | Customized split release film and optional narrow reverse-side adhesive strip for frame pre-fixing |
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 indoor moisture diffusion into the wall cavity
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
Available with customized split release film for staged and easier installation
Optional narrow reverse-side adhesive strip for convenient pre-fixing to window and door frames
