Short answer. At the bottom of a Therma-Tru paired-door astragal, the part called a bottom rubber boot must not be confused with a corner seal pad or a sill keeper plate. The 2017 replacement-parts diagram labels all three separately. source This guide addresses part location and evidence, not a general repair procedure for any unidentified French door.
Know what the document actually identifies
The 2017 book-size diagram lists distinct right and left inswing bottom boots, 7ASTBOOTR450 and 7ASTBOOTL450. source That is a historical documented parts distinction, not evidence that either item fits the installed door today. The 2017 Shop 3 page also marks the illustrated corner pads as inswing-only. source
| Candidate at lower meeting edge | Manufacturer documentation cue | Required question |
|---|---|---|
| Rubber component at bottom of astragal | Inswing bottom boot (right/left labels) source | Which original astragal/version and handing? |
| Small pad against a seal endpoint | Corner seal pad source | Does the actual assembly match the inswing illustration? |
| Metal receiving component at sill | Keeper plate/hardware source | Is this a separate hardware issue rather than a flexible seal? |
Four records to create
- Whole pair: picture both leaves, thresholds and center member to preserve left/right context. Mark inside and outside viewpoints.
- Lower meeting point: photograph the bottom tip of the astragal and the exact sill location it approaches, without forcing bolts or levering trim.
- Installed assembly information: transcribe any valid system or edition identification found in its original paperwork. If absent, write “unconfirmed.”
- Symptom versus component: write separately whether the issue is a visible missing part, a latch/bolt concern, or moisture. Therma-Tru's 2017 sill-leak table lists unrelated contributors such as sealant joints, weatherstrip condition and sill distortion. source
Choosing the next path
If a boot is positively identified by edition/side, take that evidence to an exact OEM parts determination. If the observed item is a corner pad, do not reuse a boot number. If the issue appears to be keeper hardware, astragal alignment or water at the sill, no boot selection follows. Do not treat the 2017 labels as a universal cross-year fit list, or open a rated/security-critical meeting stile without suitable service guidance.
Primary sources and claim locator register
- — Therma-Tru original, 2017 Replacement Parts Book Size — Comp 14; Comp 14 p.14.12, diagram labels boot, corner pad, keeper. Publisher document.
- — Therma-Tru original, 2017 Replacement Parts Book Size — Comp 14; Comp 14 p.14.12, right and left 7ASTBOOT numbers. Publisher document.
- — Therma-Tru original, 2017 Shop Manual BOOK SIZE — Shop 3; BOOK SIZE Shop 3 pp.3.48–3.49, inswing corner-pad caution. Publisher document.
- — Therma-Tru original, 2017 Site Manual — SITE 4, US; SITE 4 p.4.4, water leakage cause table. Publisher document.
Evidence and safety boundary
Therma-Tru’s 2017 component book (Comp 14, printed p. 14.12) and Hybrid Shop Manual (Shop 3, pp. 3.48–3.49) identify astragal boot and meeting-stile components, including left/right designations. Record the door pair’s handing and the exact visible boot location before asking for the applicable replacement drawing. Do not substitute a corner pad or alter rated/security-critical hardware based on appearance alone.