Metal Roofing Over Existing Shingles

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 over existing shingles.

Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it. Anatomy of a steel roof this is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. If a shingle is torn or cracked glue the broken piece back in place using roofing cement. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof.

Ideally a metal tile shake or shingle roof should only be installed over one or at most two layers of existing roofing and providing that the existing roof framing and decking is in good condition. A steel roof is a lifetime investment lasting 50 years or more if it s a good one. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. Metal or steel roofing can be installed over existing composite asphalt shingles with the addition of a framework.

You must put in a completely new underlayment over the existing shingles before you carry out any installation. A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles. The metal used for the roof can be tin copper aluminum or steel. When choosing to install a metal roof homeowners need to take into account several trade offs involving cost and performance.

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 to work well with metal roofing. Asphalt roofs typically last 20 to 30 years depending on the installation and shingle quality. The goal is to provide a reasonably flat surface for the new shingles to lie over with no gaps greater than 1 2 inch. Disadvantages of metal roofs.

Otherwise you will need to remove the shingles. 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. Advantages of metal roofs over shingles. 1 remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof.

This will help prevent water leakage and provide a buffer between the metal roof and the existing shingles. How to install a metal roof over existing shingles start with an underlayment over the existing shingles.