Problems With Two Layers Of Shingles

There are two ways of looking at it scrimp and cut corners to save up front or do the job right and maintain it so you wont have costs in the future. Buckling or curling shingles leave the structures underneath the roofing material exposed.

Top Reasons Why You Shouldn T Layer Asphalt Shingles Over An Existing Roof The Homebuilding Remodeling Guide

There are some advantages to roofing over existing shingles says Dale Richards owner of Richards Roofing in Troy Michigan.

Problems with two layers of shingles. Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 412 pitch or less and three layers on steeper roofs. Another issue is that when you add in the second layer it can add extra weight to your roof. This will force you to replace your roof earlier than expected.

Why Adding a Second Layer of Shingles Could Cost You Money. Youll need to check with your local building department to see if you can install metal roofing over two layers of shingles. Saving money is the name of the game with many home repairs.

Why is 2nd layer of shingles a problem. Also what about all the algae growth and. The Importance Of Quality Roof Shingles.

Two Layers hold Heat longer and heat affects the life of Asphalt Shingles. In fact about 120000 of the 12 million folks who get shingles each year. Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles.

Often there is a problem with the first layer of shingles that was not apparent before the second layer was added. Thats a lot of extra weight putting added stress on the roof decking. A second layer of shingles only complicates the job when a roofer is trying to fix a leak.

How to install metal roofing over asphalt shingles. If the structure can support the added weight a typical 20-square 2000-square-foot reroof will cost at least 1000 less than a tear-off job. Adding a second layer could compromise the structure of your roof.

Herpes zoster is a lot more than a quickalbeit irritatingrash that strikes senior citizens. Placed nails go through two layers of shingles penetrating through the previous shingle course underneath attaching them securely to the roof deck. When a buyer is purchasing a home their homeowners insurance carrier will inquire about the age of the roof and the number of layers.

Also two layers of shingles are going to attract a lot more heat than just one layer which can lead to the shingles prematurely deteriorating. This is especially true if youve overlayed your new shingles on top of warped shingles. Moisture can become trapped in the shingles or poor ventilation can lead to moisture which ultimately leads to curling and buckling.

Buckling is a moisture-related problem. If you already have two layers shingles the decision is made for you. Whether youre looking to install a steel roof over shingles.

The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. Many of them will allow one or two layers of shingles but no more than that. Richards also estimates that the homeowner saves at least 1000 in costs associated with removing and properly disposing of the existing shingles.

The second layer of shingles will trap heat which can result in the decomposition of both roof layers. You may think that a second layer of shingles will make your roof more waterproof but it actually has the opposite effect. If they allow you contact your local roofing contractor to see what they can do for you.

The International Residential Code says that you cannot put a new roof over two or more applications of any type of roof. Thats because a second layer of shingles will obscure the potential source of a leak as well as keep you from seeing underlying layers such as plywood. So back to that short answer of yes We are really talking about two different issues.

They seldom consider that in 15 years when their roofing once again fails they will have to pay significantly more to have someone remove both layers of shingles and apply new ones. In fact the extra layer can reduce your roofs lifespan by up to 40. Multiple layers of composition roofing and composition over a wood shingleshake roof.

Nails placed outside the common bond area can void the roofs warranty and prevent asphalt shingles from performing as intended during extreme weather. The biggest mistake people make when layering roofing is to purchase cheap shingles for the new roof. Many roof decks were designed to handle only one layer of shingles.

Two Layers Is Too Many Northwest Roof Maintenance Inc