Underlayment For Metal Roofing Over Shingles

If you choose to install metal roofing over shingles there are certain things you must keep in mind.

Underlayment for metal roofing over shingles.

This can be synthetic underlayment preferred 30lb felt or a double bubble radiant barrier. Installation of metal roofing over shingles. Installing a metal roof over shingles can also result in an increased chance of trapped water vapor and moisture between the new roof and old roof resulting in new mold and rot. Traditionally metal roofs have used standard 30 pound felt paper underlayment.

Address any existing roof leaks and replace rotten rafters or. And keeps the rough surface of the shingles off the backside of the metal roofing. Underlayment is also a good idea when the roof is installed over battens though a natural tendency for the underlayment to drop between the battens can be a problem. There are really two ways to install a metal roof over a shingle roof.

The quality and type of underlayments used on the project in the long term will affect the overall performance of the roof. Selecting the right underlayments for a lifetime metal roof should be a primary concern for anyone thinking about specifying or choosing to install a metal roof on their home. The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material. So when we talk about metal roofing over shingles how does it work.

This provides a couple of benefits. The first way is to run new underlayment over the existing shingle roof completely covering the old roof. If your metal roof is to be installed over solid decking or over existing shingles an environmental benefit a layer of quality underlayment between the two is essential. However contractors now recognize the benefits of synthetic.

Install underlayment between the shingles and the new metal roof. A layer of underlayment installed on top of the existing shingles will help keep the granules of the old shingles from rubbing against the back of the metal and causing possible corrosion. The industry standard for underlayment is often thought of as felt paper tar paper but there are also many newer synthetic underlayments that are designed. By removing the old roof before the new roof s installation you are able to give the underlayment a thorough inspection to ensure there are no damages that could.

We re going to break them down so you know what to look out for. But first here are a few precautions about the underlying material. The first one being that the new. Our metal roofing profiles.