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Question DetailsAsked on 6/22/2016

Should I replace a roof in 100 degree weather

I need to replace my entire composition roof. One roofer said it was better NOT to do this in the heat of summer (90 to 100 degree temperature) because it could damage the roof. Is this true?

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1 Answer


Here is the manufacturer's association brochure on that subject - not definitive on a maximum temperature though :

Generally, if the shingles are getting hot enough for the asphalt to soften to the point of being sticky then you are going to get marring from the worker's feet and possible scuffing and possibly even tearing of the shingles at extreme temps. Generally, read the shingle manufacturer's info sheet - most recommend not exceeding 85 or 90 degrees air temp for asphalt composition shingle placement. Other say the shingles themselves should not exceed about 120 degrees during work on/around them.

Ditto on the water shield - tarpaper gets pretty unworkable above about 110-130 degrees surface temp (which can happen on even 70 or so degree days if bright direct sun) and starts stretching and wrinkling, as do some synthetics and most ice and watershields.

In those conditions, most roofers tend to start as early as the law allows (like 6-7 o'clock) and work till it gets too hot to shingle, then move onto another tearoff job for the rest of the day. Also, commonly to about 85-90 you can work OK if on the shady side of the roof, avoiding the sun by planning which sides you do first.

How to specify a specific temperature in the contract is tougher - especially if in an area like the southwest or far southern states where daytime temps might be predicted to be above 85 or so for several months on end. And of course, in some areas like AZ, NM, much of TX and OK, LA and FL - if you want to avoid the risk of a damaged surface then you should probably rule out doing it in the summer months and stick to when the temp is decent - which in much of those areas might include much of the winter months.

Personally, if given a choice on a planned versus new build or emergency replacement, I would not do an asphaltic shingle roof replacement in a timeframe when daytime temps are expected to exceed about 80 degrees for much of the day - or below 45-50. Certainly check the manufacturer requirements so you are not outside of the recommended range for warranty purposes.

Answered 4 years ago by LCD

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