Second Layer Of Roof Shingles

This will force you to replace your roof earlier than expected.

Second layer of roof shingles.

That second layer of shingles won t last as long. 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. 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. How to put on a second layer of shingles evaluate the job.

That can be either architectural shingles or conventional 3 tab shingles. Another issue is that when you add in the second layer it can add extra weight to your roof. 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. The second layer of shingles will trap heat which can result in the decomposition of both roof layers.

Roofing second layer of shingles roofing. I won t speak to a haphazardly done job. Examine the existing roof. In fact the extra layer can reduce your roof s lifespan by up to 40.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Before you add shingles over shingles you need to look at the existing roof to make sure. Make repairs before. Still you ve got no less than 17 years from it already.

But check the shingle warranty from your shingle manufacturer. A second layer is more difficult to install properly. I think you ve got a good life out of it. Before you start hefting shingles to the roof consider whether or not the project is worth doing.

And so second layers generally don t last as long as the first layers. And shingles have started to separate. However there are good reasons it doesn t really cut down much on the amount of work.