Thermwell V443H Foam Weatherstrip Tape 3/8x3/16 in 17ft Grey

Product Description

The THERMWELL V443H is a self-adhesive closed-cell polyvinyl chloride foam weatherstrip tape designed to seal gaps around doors, windows, and other building penetrations to stop air and moisture infiltration. Measuring 3/8 inches wide by 3/16 inches thick with a 17-foot roll length, this grey tape provides a waterproof, airtight barrier when compressed against mating surfaces. The closed-cell PVC foam construction resists moisture absorption, maintaining its sealing performance over time. HVAC technicians, weatherization contractors, and general trades rely on this type of product to reduce air leakage in both residential and light commercial applications.

The V443H is suited for use in residential and light commercial settings where controlling air and moisture infiltration is a priority. Typical installation locations include door frames, window sashes, attic hatches, garage doors, and equipment access panels. The self-sticking backing simplifies application and eliminates the need for additional adhesives. It is commonly used during HVAC system commissioning, building envelope upgrades, or routine weatherization service calls to improve overall envelope tightness and reduce conditioning loads.

Key Features

• Closed-cell PVC foam construction resists moisture absorption and compression set
• Self-adhesive backing for direct application without additional adhesives
• Waterproof and airtight seal reduces air and moisture infiltration
• 3/8 inches wide by 3/16 inches thick profile fits standard gap sizes
• 17-foot roll length provides coverage for a full door or window perimeter
• Grey color for low-visibility installation on common frame surfaces

Compatibility

Designed as a general-purpose weatherstrip tape for use on door frames, window frames, attic hatches, and similar building envelope openings requiring air and moisture sealing.

Installation Notes

Installation does not require special tools or trade licensing, but weatherization work on mechanically conditioned spaces may be subject to local building energy codes. Clean and dry the mating surface thoroughly before applying the tape to ensure full adhesive contact. Avoid stretching the tape during application, as this can reduce long-term adhesion and sealing effectiveness. Verify gap dimensions match the tape profile before cutting to length.