Can a New Roof Go Over Old Shingles in Texas?

The short answer

Sometimes, but only once. The International Residential Code doesn't allow a roof recover (new shingles over old) when the roof already has two or more layers, when the existing roof is water-soaked or deteriorated, or when it's covered in slate, clay, cement or asbestos-cement tile. Texas law makes the IRC the residential building code in cities, so if you live inside city limits, those limits likely apply to you.

When an overlay isn't allowed

You might think a second layer is always the cheaper, faster fix. The code's reroofing section (R908.3.1.1 in the 2021 IRC) says a recover isn't permitted where:

• The existing roof is water-soaked or deteriorated to the point that it's not adequate as a base for more roofing
• The existing covering is slate, clay, cement or asbestos-cement tile
• The roof already has two or more applications of any type of roof covering

If any of those apply, the old layers have to come off before the new roof goes on.

How Texas applies the code

Under Texas Local Government Code section 214.212, the International Residential Code, as it existed on May 1, 2012, is adopted as the municipal residential building code in Texas. It applies to construction, alteration and repair of residential structures in a city. Cities can adopt local amendments and later editions, so the exact version your city enforces may differ. Your city's permit office can tell you which edition applies and whether reroofing needs a permit. Our post on roof replacement permits in Tyler and Longview shows what that looks like in two East Texas cities.

Questions to ask before you agree to an overlay

These are our suggestions, not code requirements:

1. How many layers are on the roof now? Ask the roofer to check, not guess.
2. Is the decking sound? A recover hides the deck, so soft or wet spots need to be found first.
3. Does your city require a permit? Ask the city before work starts.
4. What do your shingle warranty and insurer say? Read the manufacturer's warranty terms, and ask your insurance agent whether the number of layers matters for your policy. Our guide to roof warranties explains the two kinds of coverage.

This article is general information, not legal or engineering advice. Local amendments can change these rules.

Bottom line

An overlay may be allowed on a roof with one sound layer, but not on a roof that's already been recovered, is damaged or is tile or slate. Check the layer count and your city's rules before you decide.

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