Roof Over Asphalt Shingles

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

Roof over asphalt shingles.

Metal roofing can be installed directly on top of asphalt shingles. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles. Your roof might look fresh one day then look different after a decent and prolonged rainy night.

First asphalt shingle roofs use granules that detach over time. Don t use glossy or sheen oriented acrylic elastomeric finishes. Most codes now allow no more than two layers of roofing before requiring a complete tear off. You have to in order to comply with local building codes.

Choose a shingle style with the same dimensions as those on your. In this video we provide details on how to install roof shingles over existing shingles we discuss the nesting method which helps minimize an uneven appeara. Why re roof over asphalt shingles. In most areas around vancouver wa the building code allows for two layers of organic or fiberglass asphalt shingles for roofs that have a 4 12 or less pitch.

For a typical 2 000 square foot home layering shingles. So if your roof has two layers it may require a complete tear off even though steel is lighter than asphalt. You are using roofing underlayment and vented ridge cap to prevent moisture buildup. However you ll want to check with your local building department before you make any decisions.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Second a high quality acrylic elastomeric coating is the most useful for asphalt shingle roof painting. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. You may decide to install a metal roof over old asphalt shingle roof when.

Check with one of our professionals is you re not sure about the building code in your area. Can you avoid tearing off your old asphalt shingle roof by putting a steel roof over it. Local building code in some areas you can install over asphalt shingles but some building codes do not allow it. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.

Although many metal roof systems can be applied over an existing roof layovers are more commonly done with asphalt shingles. The current roof must be in stable condition with no rot significant dips or severe crowning. It s in compliance with your local building code. Leave the old valley flashing in place and install new over it.