Second Layer Of Roof Shingles

I think you ve got a good life out of it.

Second layer of roof shingles.

Before you add shingles over shingles you need to look at the existing roof to make sure. That in itself eats away at the. That second layer of shingles won t last as long. I won t speak to a haphazardly done job.

And so second layers generally don t last as long as the first layers. How to put on a second layer of shingles evaluate the job. In fact the extra layer can reduce your roof s lifespan by up to 40. Make repairs before.

The second layer of shingles will trap heat which can result in the decomposition of both roof layers. I don t know if a precise formula like that exists but the second layer does have less firm foundation than the first and it would be logical to expect shorter life span. A second layer is more difficult to install properly. Roofing second layer of shingles roofing.

And shingles have started to separate. Another issue is that when you add in the second layer it can add extra weight to your roof. You will get what you pay. This will force you to replace your roof earlier than expected.

It forces more oil to evaporate out of it and more of the materials that make it pliable and watertight. It is common practice to add a second layer of shingles over an existing single layer provided the roof decking is intact and the roof surface is flat. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. That can be either architectural shingles or conventional 3 tab shingles.

But check the shingle warranty from your shingle manufacturer. 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. However there are good reasons it doesn t really cut down much on the amount of work.