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Therma-Tru Complete Door System

All Therma-Tru components are engineered to work together. A complete door system includes doors, glass, and components which work together to resist leaks and drafts, and help maintain energy efficiency and weather resistance.


  1. The sill and bottom sweep form a tight seal against wind-driven moisture infiltration at the bottom of the door system and help channel moisture away from the home. A sill pan (recommended) adds an extra layer of protection to help keep moisture away from the subfloor.

  2. Corner seal pads complete the seal between the sill cap, bottom sweep and weatherstrip to help block potential pathways where wind-driven moisture can infiltrate the bottom corner of the door system. These are only used with inswing units.

  3. The hinges position the door to properly compress the weatherstrip and help form a tight, even seal against air and moisture infiltration when the door closes.

  4. The weatherstrip is specifically engineered in a variety of profiles to provide the best possible fit with Therma-Tru door systems, helping to deliver a precise seal between the door and frame.

  5. A multi-point locking system engages the door and frame at three points from top to bottom, helping to preserve the weatherstrip’s seal even under wind pressure. A multi-point locking system is highly recommended for security and protection.

  6. A lip-lite frame (shown right) features a compression seal against weather on the outside of the door and an adhesive seal against weather on the outside of the glass. Flush-glazed glass (shown left) is built directly into the door without a Lip-lite frame, featuring a high-performance adhesive weather seal inside and out.

Updated on May 14, 2019

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