WRWeatherstrip ReferenceWeatherstrip profile identification by shape & measurements
Source-bounded identification · Therma-Tru systems

Which Therma-Tru corner seal pad is shown in the 2017 drawings?

Short answer. “Therma-Tru corner pad” is not one interchangeable part. The company's 2017 HYBRID Accessories, Comp 12, pp.12.5–12.6 , illustrates separate…

Short answer. “Therma-Tru corner pad” is not one interchangeable part. The company's 2017 HYBRID Accessories, Comp 12, pp.12.5–12.6, illustrates separate pad designs for basic fixed sills, Adjusta-Fit 2, Classic-Craft hinge-side and lock-side jambs/mullions, and a stepped pad for a composite/hardwood adjustable sill. Several drawings expressly say the pads are handed. A matching-looking pad alone cannot determine your door's sill family, hinge/lock side, vintage or orderable replacement. [T01][T02]

Read the manufacturer's labels before comparing the shape

2017 illustration label What it actually establishes What it does not establish
Basic Fixed Sills A separately drawn lower-corner pad in the fixed-sill family; the drawing calls these pads handed. [T01] That its shape can replace an adjustable-sill pad.
For Adjusta-Fit 2 A different illustrated pad, labelled for Adjusta-Fit 2. [T01] That any other adjustable sill is Adjusta-Fit 2.
Classic-Craft for Hinge Jambs/Mullions A labelled hinge-side/mullion illustration, marked handed. [T01] That every Classic-Craft installation uses the same revision.
Classic-Craft for Lock Jambs/Mullions A separate lock-side/mullion illustration, also marked handed. [T01] That hinge- and lock-side parts may be exchanged.
Stepped Corner Seal Pad for Composite/Hardwood Adjustable Sill A further family illustrated on the following page, marked handed. [T02] That a 2017 drawing establishes present-day stock or interchange.

These are illustration categories, not a modern fit chart. The manufacturer also lists separate “Classic-Craft 7-Shape,” “Fiber-Classic / Smooth-Star 7-Shape” and “Basic Fixed” offerings on its component overview. That more recent marketing taxonomy is another reason to verify the exact assembly rather than translating “seven-shaped” into one SKU. [T03]

Record five observations without removing the weatherstrip

  1. Door system: photograph the whole entry, both lower corners and the sill. Copy any known order paperwork, installation date or exact door/sill identification; if you cannot establish it, write unknown.
  2. Swing: record whether the door swings inward or outward. The Therma-Tru Project Center new-construction Step 9 specifically limits the pad step shown there to inswing doors. This does not prove that no other corner seals exist for outswing assemblies. [T04]
  3. Location: describe whether the suspected missing material is a short discrete lower-jamb pad, the continuous upright weatherstrip, a door-bottom bulb, or an astragal boot. The 2017 troubleshooting table distinguishes missing corner pads from missing or damaged jamb weatherstrip. [T05]
  4. Side and view: note hinge-side versus latch/lock-side, exterior versus interior photo viewpoint, and whether the system includes a mullion. A mirrored photo can reverse the apparent side; do not order a handed pad by picture alone.
  5. Condition: document torn pieces, paint contamination or a visible gap, but do not infer the leak's root cause. A broken sill–jamb joint or sill-to-subfloor sealing issue is separately discussed in the 2017 water-leak troubleshooting table. [T06]

What about the orientation and sequence of installation?

The manufacturer’s 2017 SITE 5, p.5.23, places corner-pad application after final adjustments of an illustrated adjustable-sill threshold. It depicts the pad against the lower jamb, tucked behind the jamb weatherstrip at the sill. [T07] The Project Center illustration for its specified inswing installation also describes the pad's tab orientation. [T04] These observations help an installer identify which junction the instruction concerns; they are not blanket instructions to readjust every installed threshold or reuse a pad on another sill. The 2017 basic fixed-sill page has its own separate corner-pad illustration, which is a further reason not to merge repair steps across threshold types. [T08]

Ask the dealer or manufacturer these exact questions

  • “Does my documented system use the basic fixed, Adjusta-Fit 2, composite/hardwood adjustable, or another sill design?”
  • “Which original publication edition and replacement drawing covers this exact entry and swing?”
  • “Is this a handed corner pad? Which view defines left/right and hinge/lock side?”
  • “Does the pictured pad belong at the jamb/sill junction, or is the missing piece a different gasket or bottom boot?”
  • “What is the currently orderable exact part number, and what supersession evidence confirms it for my assembly?”

Outcome: With the exact door/sill family and a dealer-confirmed handed part, proceed through the manufacturer-specified maintenance channel. With a pad shape but no system identity, keep it unconfirmed; compare the original drawing before shopping. If water is entering under a threshold, do not diagnose it as a pad problem alone. Do not pry up the sill, drill, shim, re-caulk a hidden joint, or modify a rated door using this identification page.

Original illustration brief

Produce a new five-card comparison graphic showing only labelled family names and location arrows, not reproduced Therma-Tru drawings or dimensions. Include a separate inset “photo viewed from inside / which side?” and a “system unknown — no fit assertion” label.

Primary sources and locators (not interchange approvals)

Canonical check: Distinct from separate 69-owner NW0116 ( is it a corner pad or jamb strip? ). This page answers which illustrated 2017 corner-pad family and handed side is it? Send any generic component-location sentences to NW0116 owner rather than republish. Dated 89-route /door/weatherstrip-replacement/ is generic, not a system-specific pad-family chart.

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