Thermwell V444H Gray Foam Weatherstrip Tape 3/8x1/4 in

Product Description

The THERMWELL V444H is a gray, closed-cell foam weatherstrip tape designed to seal gaps around doors, windows, and other building penetrations where air and moisture infiltration must be controlled. The tape measures 3/8 inches wide by 1/4 inches thick and comes in a 17-foot roll, providing enough material for a standard door or window opening in a single pass. Its pressure-sensitive adhesive backing bonds directly to clean surfaces, and the closed-cell foam compresses flat under contact pressure to form a continuous, resilient seal. HVAC technicians, insulation contractors, and general construction trades use this product to reduce drafts and improve building envelope performance.

This tape is suited for residential and light commercial applications where a compressible, self-adhering seal is needed at door frames, window sashes, attic hatches, access panels, and equipment enclosures. The closed-cell construction resists moisture absorption, making it appropriate for both interior and exterior installations where condensation or incidental water contact is possible. It can also be used to seal gaps around HVAC cabinet doors, duct access panels, and similar enclosures where air bypass must be minimized.

Key Features

• Closed-cell foam construction resists moisture absorption and maintains shape under repeated compression
• Pressure-sensitive adhesive backing — no additional adhesive required for installation
• Compresses flat to form a tight, continuous seal against irregular or uneven surfaces
• 3/8 inches wide by 1/4 inches thick profile fits standard door and window gap tolerances
• 17-foot roll length covers a full door or window frame in a single roll
• Gray color blends with common metal and painted surfaces in mechanical and building applications

Compatibility

Designed as a general-purpose weatherstrip sealing tape for residential and light commercial door frames, window sashes, attic access panels, HVAC cabinet enclosures, and similar gasketing applications requiring a compressible foam seal.

Installation Notes

Clean and dry all surfaces before applying the tape to ensure full adhesive contact. Remove the release liner and press the tape firmly into place along the sealing surface, applying hand pressure along the full length of the run. No special tools are required, but surfaces should be free of dust, oil, and loose paint prior to application. Power down any equipment or HVAC unit before applying tape to internal cabinet surfaces or access panels.