Metal Roof Over Existing Asphalt Shingles

Most codes now allow no more than two layers of roofing before requiring a complete tear off.

Metal roof over existing asphalt shingles.

Can you install metal roofing over asphalt shingles. Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it. In some areas building officials only allow a re roof over one layer of shingles.

I m framing up over an existing shingle roof with 2 by 4 s because the sheeting is sagging i figured if i used 2by4 instead of 1 by 3 it will help the metal lay even without taking shape of the sheeting that s sagged well after nailing one 2 by 4 up there i noticed there s some spots where there s gaps between the 2 by 4 and. Installation of metal roofing over shingles. Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. When choosing to install a metal roof homeowners need to.

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. Metal roofing weighs less than one pound per square foot. The metal used for the roof can be tin copper aluminum or steel. Some roofing contractors recommend reroofing with standing seam metal because the total roof weight is but a fraction of a standard asphalt shingle roof which helps preserve the roofing integrity.

If you choose to install metal roofing over shingles there are certain things you must keep in mind. If you don t want to take our word for it check with your local building department. We re going to break them down so you know what to look out for. Address any existing roof leaks and replace rotten rafters or.

However before you decide on reroofing with a metal roof you have to keep in mind that there are specific conditions that make reroofing with a. But first here are a few precautions about the underlying material. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

This post discusses using stone coated metal shingles over the top of asphalt shingles. 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.