How Long Does A Second Layer Roof Last

Won t last as long generally speaking the shingles that are laid over the old roof won t last as long as their natural lifetime due to extra heat trapped by the added layers.

How long does a second layer roof last.

Installed correctly a new roof will last at least 15 years but the exact lifespan depends on the material. You could be adding weight to your roof with a second layer that your house cannot handle. Cedar shake can also go for about three decades. It will shorten the lifespan of your roof.

And shingles have started to separate. This is especially true if there is huge snowfall. But because of the amount of prep work involved in overlaying a roof properly any savings are usually modest maybe 25 percent compared to a new roof. With proper installation you can expect a 25 to 40 years lifespan from a ribbed metal roof with exposed fasteners.

If there are any pros to overlaying a roof it s saving a little bit of money. Still you ve got no less than 17 years from it already. Asphalt roof shingles remain waterproof until they dry out. This will force you to replace your roof earlier than expected.

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. When replacing your roof it s usually a good idea to remove the original layer of roof shingles but only if you intend to live in the home for most of the life of the new roof. The shingles likely won t last as long so the job could actually end up costing you more in the long run. The second layer of shingles will trap heat which can result in the decomposition of both roof layers.

You are correct that second layers typically don t last as long as single layers. However there are premium brands that can serve you diligently for 50 years. A ribbed metal panel roofing system featuring concealed fasteners will offer a longer lifespan ranging from 30 to 50 years depending on the environment. But because of the amount of prep work involved in overlaying a roof properly any savings are usually modest maybe 25 percent compared to a new roof.

Most homes have asphalt or composite shingle roofing which normally last about 20 years. Adds weight you re literally adding another roof to the top of your home so if your home is older or is not structurally sound you may not even be able to complete this type of roof job. Fiber cement can go up to 25 years and the thicker asphalt can give you about 30 years. The shingles likely won t last as long so.

I think you ve got a good life out of it. Here learn which roofing lasts the longest.