Shingles Roof Layers

When it s time to replace your roof there are several factors that might lead your roofing professional to recommend adding shingles on top of your existing layers.

Shingles roof layers.

Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed. You ll need longer nails for this part as you re driving through more layers of shingles. Saving on the initial shingle installation doesn t solve the long term cost of adding a second layer of shingles. Most building codes allow this but is it a good idea.

Framing includes the roof trusses that sit at the top of your house and support the weight of all the materials used to build your roof. Bring the ridge edges together with a ridge capping layer. First of all multiple layers of shingles simply means layering a new asphalt shingle roof on top of the old one rather than stripping the roof completely to expose the sheathing and replacing it with new shingles. Synthetic underlayment helps repel moisture and provides protection against water infiltration.

3 tabs are less expensive but also less durable have lower wind resistance and have a flatter appearance. This is water resistant so moisture can pass through and water in a liquid form is blocked. Pros to overlaying a shingle roof. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

Two layers of shingles trap more heat which in turn damages the shingles and shortens the life span of the roof. That limit pertains to roofs with up to a 4 12 pitch. Asphalt shingles come in two major types 3 tab and architectural. There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan.

Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. It will cover all of your roof deck. Roofing layers from the framing to the shingles so we ll start at the bottom of the deck and work our way up through all the roofing layers until we reach the shingles and sunshine above your roof.

You create them through shingle snapping or buy them directly. Here are the pros and cons. Roofing underlayment is a layer of material usually synthetic or felt that adds extra protection on top of the roof deck and under the shingles. Shingles are the element that most homeowners are familiar with as it is the layer you can see from the outside of your home and it is an important aesthetic aspect.