Metal Roofing Over Existing Asphalt Shingles

You have to in order to comply with local building codes.

Metal roofing over existing asphalt shingles.

It depends on the situation. This is by far the most common way to install a metal roof. The metal used for the roof can be tin copper aluminum or steel. The low weight of metal roofing is one thing that encourages this.

Your metal roof warranty will be void by installing over asphalt shingles. 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. Metal roofing weighs less than one pound per square foot. 3 install 1 4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1 4 purlins over the shingle roof.

You shouldn t attach the metal directly to the osb roofing deck. Yes you can install a metal roof over shingles. Other issues include venting the eaves and the ridge. You are using roofing underlayment and vented ridge cap to prevent moisture buildup.

In some areas building officials only allow a re roof over one layer of shingles. You may decide to install a metal roof over old asphalt shingle roof when. Most codes allow only two layers of roofing before requiring a complete tear off. However to do so you must meet the following requirements.

In terms of performance many homeowners choose a steel roof making it the most popular option when it comes to creating a metal roof over existing shingles. The current roof must be in stable condition with no rot significant dips or severe crowning. The vast majority of installations of the metal roofing systems produced by my company are over existing shingles. Metal roofing can be installed directly on top of asphalt shingles.

Local building code in some areas you can install over asphalt shingles but some building codes do not allow it. It s in compliance with your local building code. However you ll want to check with your local building department before you make any decisions. Installing metal roofing over shingles is the best solution.

Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh. You need to add furring strips over the top of the shingles so you have something to attach the metal panels to. If you don t want to take our word for it check with your local building department. Asphalt shingles can weigh up to four pounds per square foot depending on the brand.