Can Metal Roofing Be Applied Over Shingles

For one you will need to check with your local building department and ask if this is an approved installation method.

Can metal roofing be applied over shingles.

Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. However you ll want to check with your local building department before you make any decisions. The vast majority of installations of the metal roofing systems produced by my company are over existing shingles.

There are really two ways to install a metal roof over a shingle roof. In some areas building officials only allow a re roof over one layer of shingles. Cool outside air then travels under the shingles to the vented ridge detail 2 pulling out moisture and heat. The low weight of metal roofing is one thing that encourages this.

Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. You can apply fascia board and paint it just like you would any other exterior trim. The main benefit of doing it this way is that it is the fastest way to install a new metal roof over a shingle roof.

However there are some things that you will want to check out before doing it this way. One big advantage to metal roofing is its light weight which means metal roofing can be installed over an existing shingle roof. A professional roofer or contractor may give you different advice based on the condition of your house. The first way is to run new underlayment over the existing shingle roof completely covering the old roof.

Metal roofing weighs less than one pound per square foot. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. 2 install underlayment right over the shingles before installing the metal roof the second way to install a metal roof over a shingle roof is by applying an approved underlayment right over the old shingle roof.

This is just one way to apply metal roofing over composite shingles. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load. Otherwise you will need to remove the shingles. If you don t want to take our word for it check with your local building department.