This document is the manufacturer stating that its own products cannot be combined on one building. Owens Corning prohibits mixing the current Oakridge Limited Lifetime shingle with the discontinued Oakridge Pro 30, and requires mixed shingles to carry identical lot numbers regardless of product line — a standard almost no repair can meet.
Do-not-mix Owens Corning · Roofing · 2021 · 1 page
Oakridge® Shingle Compatibility Letter
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Oakridge® Shingle Compatibility Letter
Issued by Owens Corning. Published here complete — no summary standing in for the document, no email required.
Issued by Owens Corning. Held in this firm’s reference library; not published elsewhere. Homeowner-identifying details, where a letter was addressed to a particular property, are blacked out — nothing else is altered, and no operative text is ever redacted.
What to do with it
This is the argument carriers least expect, because it does not come from you. When the manufacturer says two of its own products may not share a roof, a repair that combines them is not a cheaper way of doing the job — it is a defective installation, and the party who directed it owns the outcome.
- You have the manufacturer’s document. That part is finished. Most homeowners never get this far, and it is the step a carrier cannot argue with — it is not your opinion, it is the company that made the product.
- Put it in writing, to the adjuster, with the claim number. Attach the document and ask one specific question: name the exact replacement product — manufacturer, line, colour, dimensions, exposure, nail zone, sealant design, supplier, quantity available locally — and who will answer for the repair if it fails. Vague answers are the whole game; a specific question ends it.
- Get the position on the record before anything gets installed. Once a mismatched or incompatible repair is on the building, you are arguing about something already done.
If you want the second and third steps handled by someone who does this for a living, that is what we are for — and the review costs nothing. If you would rather do it yourself, the document above is yours either way. That is the point of publishing it.
Related documents
Other Owens Corning documents
Owens Corning hail damage
The plainest rejection of spot repair in this library, from the manufacturer rather than from us. Owens Corning also states that once hail dislodges granules and exposes the asphalt, the roof’s performance has been compromised.
Owens Corning TruDefinition Duration · Oakridge · Supreme
Owens Corning’s three main residential series are not interchangeable with one another — so a repair that reaches for a different series than the one installed is outside the manufacturer’s guidance.
Owens Corning Classic (20-year 3-tab)
Owens Corning confirms the 20-year three-tab Classic® is gone.
Owens Corning Oakridge II
Confirmed in writing on April 21, 2022.
Owens Corning Oakridge Plus
Confirmed in writing on April 21, 2022.
Owens Corning Oakridge Pro 30 · Pro 40 · Pro 50
All three Pro Series shingles discontinued — and the letter closes the substitute door in the same paragraph.
Other manufacturers saying the same thing
Atlas Pinnacle
Three separate dimensional eras of the same product name. Pre-2013 Pinnacle measured 38¼″ × 13⅛″ at a 5⅝″ exposure; 2013–2017 measured 39⅜″ × 14″ at 6″; 2017-on measures 42″ × 14″ at 6″. A “Pinnacle roof” tells you almost nothing until you know which era.
Atlas Pinnacle · StormMaster Shake
Effective July 2, 2013 Atlas changed the dimensions of both lines — from 38¼″ × 13⅛″ to 39⅜″ × 14″ — and stated plainly that the two generations cannot share a roof deck.
Atlas Pinnacle Pristine
Atlas states a do-not-mix condition between the original Pinnacle Pristine and every later version. It no longer manufactures a shingle at a 5⅝″ exposure or 39⅜″ length, and the current HP42 cannot be installed on the earlier roof.
CertainTeed Landmark and related lines
Even where the product name has not changed, CertainTeed identifies three conditions that defeat a partial repair on an aging roof: the older shingles have lost pliability, the granule blend has been reformulated, and lines such as Landmark converted from English to metric dimensions.
The rule this document serves
Your policy promises repair or replacement with material of like kind and quality. That is a replacement-cost and indemnity obligation, not an appearance theory — and it is why “matching” is the carrier’s word, not the policy’s. Where the installed product cannot be bought, or cannot be combined with what is still sold, the covered building cannot be restored to like kind and quality by patching it, and that is true before anyone argues about how it looks. The full doctrine, and the other 125 documents, are on the discontinued materials hub.
You have the manufacturer's document. The next part is the argument. Handing a carrier a technical bulletin and getting it honoured are two different jobs. The case review is free, and you pay nothing unless we recover.
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