2 Layer Shingle Roof

Having an old layer of roof shingles under your new layer accelerates that process as the original layer holds a lot of heat. So chances are if your roof already has more than one layer of roofing you re ineligible. That in itself eats away at the savings.

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2 layer shingle roof.

Asphalt roof shingles remain waterproof until they dry out. Building codes and most municipalities will usually allow you to overlay a second though never a third layer of asphalt shingles over an existing shingled roof. That second layer of shingles won t last as long. This will force you to replace your roof earlier than expected.

If you put a second layer on the second layer doesn t usually last as long as the first layer. Yeah we ll say this. Never do a shingle over. 4 layer shingle roof tear off duration.

Doing a second layer right means a lot of prep work goes into the overlay anyway and flashing which remember is the most vulnerable point on your roof is harder to guarantee. However i ve seen older homes that experience severe settling after a second roof is added over the first. Apply the starter shingle so that the. Because the first layer holds a lot of heat and that can over the long haul wear out the second layer because that heat is the enemy of the asphalt shingle.

If you only have a single layer of roofing currently and your home is fairly new structurally the home will probably withstand the extra weight. The resulting shingle will be 1 2 the height and the same length as an uncut shingle. Another issue is that when you add in the second layer it can add extra weight to your roof. The savings you re going to see may be in the range of a modest 25.

This is the starter row shingle. The second layer of shingles will trap heat which can result in the decomposition of both roof layers. You are correct that second layers typically don t last as long as single layers. It isn t uncommon to layer a second roof right over the first and then tear everything off before you put a third layer down.

Collizaki 90 995 views 9 39 applying asphalt roof shingles bob. Cut enough shingles to cover the length of the lower edge of all roof planes. Walter wilson 3 831 views 3 23 diy shingles over existing roof duration. In fact the extra layer can reduce your roof s lifespan by up to 40.

It will drastically reduce your roof life.

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