Short answer. In the Therma-Tru 2011 Hinged Patio Door System installation sheet, a rain deflector is an assembly at the bottom of the door slab, with distinct base and fin parts. source It is not the same location or task as vertical jamb weatherstripping, which the same 2011 installation document separately describes as removable from the jambs during finishing preparation (PDF index 1, instruction 2). Before replacing a strip to stop rain, identify whether you are looking at the bottom deflector or at a sealing joint elsewhere.
Two different inspection routes
| Location | What the cited document shows | Inspection note |
|---|---|---|
| Along the lower face/edge of the moving patio slab | Section 24 shows the rain-deflector base and a fin in its front channel. source | Photograph base, fin and the bottom edge together; note missing or damaged components, without drilling. |
| Around the weather-side frame and front sill edge | Section 25 separately discusses perimeter joints, bottom sill edge, exterior hardware trim joints and cap flashing. source | Record exact wetness position and any obvious open joint, rather than crediting the deflector for every leak. |
The manual also says not to paint the gaskets or weatherstrip. source If material has been painted over, record that as a condition to discuss with an installer; do not scrape a seal on an unverified assembly.
A useful photo-and-question checklist
- Door-bottom photo: look straight along the lower slab edge for the two-piece assembly shown in section 24. source Write down whether the fin, base or both are visible.
- Frame-perimeter photo: show both vertical weather-side frame edges, the top area and sill-front meeting point as separate views, with any wet spot clearly marked. Those are distinct places in the document's section 25 weatherproof checklist. source
- Finish condition: note any paint on a gasket/strip. Compare it with section 25's explicit finishing restriction. source
- Decision: classify as deflector component question, perimeter/joint question or water path not established. Seek system-specific professional inspection for persistent ingress.
Where this article stops
A missing fin may justify identifying a fin; it does not establish that the remainder of the unit is watertight. A wet jamb also does not prove the bottom deflector failed. Section 24 includes installation steps and exact fasteners for the 2011 version, but this article intentionally does not prescribe retrofitting or machining a different door using those dimensions. No modern compatibility or weatherproof-performance claim is implied.
Primary sources and claim locator register
- — Therma-Tru original, TPDINSTALL65 (2011-04-25) Hinged Patio Door System; TPDINSTALL65 printed p.17 §24, rain deflector base/fin. Publisher document.
- — Therma-Tru original, TPDINSTALL65 (2011-04-25) Hinged Patio Door System; TPDINSTALL65 printed p.17 §25, exterior seal joints & flashing. Publisher document.
- — Therma-Tru original, TPDINSTALL65 (2011-04-25) Hinged Patio Door System; TPDINSTALL65 printed p.17 §25, paint/stain caution. Publisher document.
Evidence and safety boundary
Therma-Tru’s TPDINSTALL65 hinged-patio instructions (dated 2011-04-25, printed p. 17, steps 24–25) show a rain-deflector detail separately from exterior perimeter sealing. Identify whether the observed concern is at the deflector, a frame contact seal or a sill/jamb joint; photograph each without removing trim. A detail for that 2011 assembly does not establish a retrofit dimension or approve modifications to another door.