Layers Of 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.

Layers of a shingle roof.

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. Here are the pros and cons. Ice water barrier this self adhering water proof and self sealing membrane is applied to the roof deck. 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.

You can usually see the underside of plywood decking from the attic. That limit pertains to roofs with up to a 4 12 pitch. Pros to overlaying a shingle roof. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.

It provides structure by tying the trusses and joists together. 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. Most often made out of plywood this roof layer is installed over the framing in a typical roof install. Most building codes allow this but is it a good idea.

Disadvantages to a roof recover. Most building codes allow up to two layers of organic or fiberglass asphalt shingles.