Roofing 2 Layers Shingles

How to put on a second layer of shingles evaluate the job.

Roofing 2 layers 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. 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. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.

Before you add shingles over shingles you need to look at the existing roof to make sure. This is especially true if you ve overlayed your new shingles on top of warped shingles. In fact the extra layer can reduce your roof s lifespan by up to 40. The temporary savings you receive from adding a second layer of shingles does not outweigh the negative aspects.

So we ll start at the bottom of the deck and work our way up through all the roofing layers until we reach the shingles and sunshine above your roof. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. Having an old layer of roof shingles under your new layer accelerates that process as the original layer holds a lot of heat. This will force you to replace your roof earlier than expected.

Two layers of shingles trap more heat which in turn damages the shingles and shortens the life span of the roof. Saving on the initial shingle installation doesn t solve the long term cost of adding a second layer of shingles. Roofing layers from the framing to the shingles. Examine the existing roof.

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. For example there s a starter course of roofing shingles installed at the eaves before the roofing shingles you can see. Most shingle warranties do not apply when shingles are layered over existing roofing according to internachi. Shingles are the element that most homeowners are familiar with as it is the layer you can see from the outside of your home and it is an important aesthetic aspect.

The second layer of shingles will trap heat which can result in the decomposition of both roof layers. Make repairs before. Asphalt roof shingles remain waterproof until they dry out. You are correct that second layers typically don t last as long as single layers.

Eliminating the tearoff can easily save 1 000 or more on a new roof but you re really just delaying the cost.