Roofing Layers Shingles

Benefits of adding multiple shingle layers.

Roofing layers shingles.

Shingles protect sloping rooftops from the effects of rain snow and hail while providing an attractive crown for the house. How many layers of shingles are allowed on a roof. Doing it properly will keep you without problems for 20 or 40 years. Pros to overlaying a shingle roof.

If two layers already exist you ll need to remove the old layers before installing a new layer of shingles. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. California roofing codes establish a list of rules that all builders and contractors must adhere to in order to ensure safe building practices within the state.

Most building codes allow this but is it a good idea. 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. Any more than two layers of shingles can be too much for the roof to handle even if the local building codes don t outlaw it. Additionally it prevents wind driven rain from getting under your shingles and causing damage to your roof structure or the inside of your.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. 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. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. 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.

California roofing laws cover everything from licensure of the roofing company to the types of shingles that must be used to the slope of the roof. 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. It helps reduce blow off by allowing your shingles to lay flatter and more uniformly. There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan.

Here are the pros and cons. That limit pertains to roofs with up to a 4 12 pitch. In most areas building codes allow for up to two layers of shingles installed on a roof. Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed.

Keeping a solid roofing layer of shingles is an important way to avoid water damage and leaks. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.