Roofing 2 Layers Shingles

Two layers of shingles trap more heat which in turn damages the shingles and shortens the life span of the roof.

Roofing 2 layers shingles.

Roofing layers from the framing to the shingles. Make repairs before. This is especially true if you ve overlayed your new shingles on top of warped shingles. Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles.

How to put on a second layer of shingles evaluate the job. The second layer of shingles will trap heat which can result in the decomposition of both roof layers. Before you add shingles over shingles you need to look at the existing roof to make sure. For example there s a starter course of roofing shingles installed at the eaves before the roofing shingles you can see.

Another issue is that when you add in the second layer it can add extra weight to your roof. In fact the extra layer can reduce your roof s lifespan by up to 40. When it s time to replace the roof again and you have no choice but to start anew two layers is the maximum allowed in most areas you ll have to pay extra for the two layer tearoff and disposal. Asphalt roof shingles remain waterproof until they dry out.

Most shingle warranties do not apply when shingles are layered over existing roofing according to internachi. Having an old layer of roof shingles under your new layer accelerates that process as the original layer holds a lot of heat. Eliminating the tearoff can easily save 1 000 or more on a new roof but you re really just delaying the cost. You are correct that second layers typically don t last as long as single layers.

There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan. Asphalt shingles come in two major types 3 tab and architectural. The temporary savings you receive from adding a second layer of shingles does not outweigh the negative aspects. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.

The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. Saving on the initial shingle installation doesn t solve the long term cost of adding a second layer of shingles. This will force you to replace your roof earlier than expected. Before you start hefting shingles to the roof consider whether or not the project is worth doing.

Examine the existing roof.