It can be nearly impossible to fix if you have a roof with two or more layers and you notice roof leaks. While you can use roofing cement, sealant, and tarps to prevent major damage, you'll ultimately need to replace the roof. Can you repair a roof that has two layers of shingles? Yes, you can, but deciding isn't always easy. You need to weigh several key factors when it comes to a double-layer tile roof.
It's not about whether you can fix it, but also whether you should. Well, adding a layer of architectural tiles on top of 3-tab asphalt tiles causes an aesthetic problem. This is because 3-tab asphalt shingles have a 5-inch exposure (you can see 5 inches of the tile out of a total of 12 inches), while architectural tiles have a 5-inch exposure. The last thing you want is to regret adding a second layer of shingles instead of having to replace the roof completely.
See The 5 Things to Consider When Replacing Your Roof to learn what to consider for your next roof replacement. The sole purpose of replacing a roof is to replace roof materials and components that have reached the end of their useful life. If they don't inspect the condition of your gaskets or simply ignore the problems, I guarantee that there will be roof leaks in problem areas. The roof cover (also known as roof covering) is the base on which the rest of the components and materials are installed.
Just keep these things in mind when deciding if it's worth nailing a new layer of shingles over your old roof. Like roof coverings, these components and materials will not be replaced when adding a second layer of shingles. It takes skill to find a leak in an asphalt tile roof, track it down and repair it under normal circumstances. Unfortunately, if you add a second layer of shingles to your roof, you won't be eligible for the enhanced warranty.
A second layer of shingles may seem like a shortcut to a quick solution, but it can hide underlying problems, add unnecessary weight and shorten roof life. This allows the roofing contractor to inspect the integrity of the roof to see if it can support the new roof. What makes it difficult to repair is that the leak could come from two different parts of two different roofs. That's why you should immediately ask your roofing contractor if you've seen any problems with roof coverings when you're considering adding a second layer of roof tiles.
After all, you added a second layer of shingles to an asphalt shingle roof near or at the end of its useful life. However, over time, the weight will damage the roof structure and could cause the roof to collapse.
