Thermwell BT35H Aluminum Bumper Threshold 3 Inch Vinyl Seal

Product Description

The THERMWELL BT35H is an aluminum bumper threshold designed to create a tight seal at the base of an exterior door. It features a resilient vinyl bumper that presses firmly against the door face when closed, blocking drafts, dust, and moisture at the threshold line. A secondary vinyl bottom insert adds an extra layer of weather sealing beneath the threshold body. At 0.95 pounds, the unit is lightweight for handling and cutting during installation. This threshold is a standard component in exterior door weatherization work performed by general contractors, carpenters, and skilled trade professionals.

This threshold is suited for residential exterior door applications where air infiltration and water intrusion at the door base are concerns. It installs on the floor at the door sill, bridging the gap between the door bottom and the finished floor or subfloor surface. The dual vinyl sealing system makes it appropriate for entry doors, service doors, and utility room doors exposed to weather.

Key Features

• Aluminum construction provides corrosion resistance and structural durability at the door sill
• Resilient vinyl bumper seats securely against the door face when closed
• Vinyl bottom insert delivers secondary weather sealing beneath the threshold
• Lightweight at 0.95 pounds for ease of handling and field cutting
• 3-inch profile fits standard door sill configurations

Compatibility

Designed as an OEM-style replacement or new-install threshold for standard residential exterior door applications requiring a 3-inch aluminum bumper threshold profile.

Installation Notes

Installation is typically performed by a carpenter or general contractor as part of exterior door weatherization. The threshold is fastened to the subfloor or sill at the door opening using appropriate screws for the substrate material. Field cutting to door width is standard practice using a hacksaw or miter saw with a metal-cutting blade. Ensure the door bottom clears the vinyl bumper with the door in the open position before final fastening.