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The sun shouldn’t directly damage your roof, but problems may show up inside

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The sun shouldn’t directly damage your roof, but problems may show up inside

Via NationalPost

For most people, during summer their air-conditioning unit is their best friend. (I’m not a big fan myself, but whenever they come over, my kids complain that it’s too hot .)

If the A/C shuts down when it’s really hot or during a heat wave, it can be torture. And one question that comes up a lot is what happens to a house that’s too hot?

The good news is that the majority of construction products we use in US are made for USA weather, which we know can go from one extreme to the other — we get very cold winters and extremely hot summers. So most products can stand up to the heat, especially exterior products and materials.

What we do get is expansion — remember, most materials expand in the summer and contract in the winter — and sometimes that expansion creates too much pressure and causes damage. For example, too much pressure can build up around windows, which could damage the windows themselves or break the insulation seal in between double- or triple-paned windows.
Obviously, a higher quality window will be able to handle this extra pressure better than a lower-quality product. But if it does happen, the window’s thermal barrier is compromised, which means the window might need to be replaced.

What about your roof? Can too much heat damage it?

The heat and sunlight hitting the roof might not — roofing products are made to handle that — but the real trouble will occur if there isn’t enough ventilation and insulation in the attic. That will really do a number on the roof, by causing, for example, asphalt shingles to curl and wear out prematurely, and mould and/or rot in the roof structure. As most roofing materials are dark (especially asphalt shingles) they’ll absorb more heat. If there isn’t enough insulation in the attic, all that heat will eventually make its way inside the house, warming it up throughout the day so that by nightfall it will be hotter inside the house than outside.

If your home is too warm, not only is it uncomfortable for the people inside, in some cases it can be a major health risk, such as for the elderly or small children.

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