Second Layer Of Roof Shingles

In fact the extra layer can reduce your roof s lifespan by up to 40.

Second layer of roof shingles.

This will force you to replace your roof earlier than expected. Still you ve got no less than 17 years from it already. And shingles have started to separate. Before you start hefting shingles to the roof consider whether or not the project is worth doing.

That can be either architectural shingles or conventional 3 tab shingles. You will get what you pay. 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. 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.

And so second layers generally don t last as long as the first layers. Examine the existing roof. How to put on a second layer of shingles evaluate the job. That in itself eats away at the.

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. Make repairs before. Another issue is that when you add in the second layer it can add extra weight to your roof. But check the shingle warranty from your shingle manufacturer.

However there are good reasons it doesn t really cut down much on the amount of work. It forces more oil to evaporate out of it and more of the materials that make it pliable and watertight. I think you ve got a good life out of it. That second layer of shingles won t last as long.

Before you add shingles over shingles you need to look at the existing roof to make sure. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. The second layer of shingles will trap heat which can result in the decomposition of both roof layers.