Roofing Layers Shingles

If two layers already exist you ll need to remove the old layers before installing a new layer of shingles.

Roofing layers shingles.

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. 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. Shingles protect sloping rooftops from the effects of rain snow and hail while providing an attractive crown for the house. Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed.

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 laws cover everything from licensure of the roofing company to the types of shingles that must be used to the slope of the roof. How many layers of shingles are allowed on a roof. Here are the pros and cons.

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. Pros to overlaying a shingle 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. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

That limit pertains to roofs with up to a 4 12 pitch. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan. 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.

Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. Keeping a solid roofing layer of shingles is an important way to avoid water damage and leaks. Doing it properly will keep you without problems for 20 or 40 years. Additionally it prevents wind driven rain from getting under your shingles and causing damage to your roof structure or the inside of your.

The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. This felt or rubberized asphalt sheet provides an extra layer of protection between your shingles and your roof deck. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. It helps reduce blow off by allowing your shingles to lay flatter and more uniformly.

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. Benefits of adding multiple shingle layers.