Air sealing and draft control
Confirm product compatibility, field conditions, code requirements, and installation responsibilities before pricing this scope.
About Threshold
Door sill components that manage water, air sealing, accessibility, and wear at the bottom of an exterior opening. This page gives buyers, contractors, architects, and suppliers a practical starting point for comparing scope, specifications, installation context, and quote requirements before selecting a brand or submitting a project.
Common Applications
Bulk water management at sills and perimeters
Confirm product compatibility, field conditions, code requirements, and installation responsibilities before pricing this scope.
Energy, comfort, and envelope performance upgrades
Confirm product compatibility, field conditions, code requirements, and installation responsibilities before pricing this scope.
Selection Criteria
What To Compare
- Substrate compatibility and exposure conditions
- Joint size, compression set, UV rating, and service life
- Air leakage, water resistance, thermal continuity, and maintenance access
Specification Notes
- Verify first
- Gap size, movement, substrate condition, UV exposure, water path, and whether the seal must be replaceable.
- Coordinate with
- Thresholds, sweeps, flashing, backer rod, sealants, WRB transitions, and drainage planes.
- Watch for
- Trapped water, sealant three-sided adhesion, compressed gaskets, incompatible materials, and inaccessible maintenance points.
Need help with threshold?
Share the project type, location, opening sizes, schedule, and whether you need supply, installation, replacement, or specification support. BuildOpenings can use that context to route the request to better-fit weatherization companies.
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