Can Metal Roofing Be Applied Over Shingles

One big advantage to metal roofing is its light weight which means metal roofing can be installed over an existing shingle roof.

Can metal roofing be applied over shingles.

A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. 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. 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.

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. The low weight of metal roofing is one thing that encourages this. 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.

Otherwise you will need to remove the 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. A professional roofer or contractor may give you different advice based on the condition of your house. For one you will need to check with your local building department and ask if this is an approved installation method.

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 first way is to run new underlayment over the existing shingle roof completely covering the old roof. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof.

This is just one way to apply metal roofing over composite shingles. However there are some things that you will want to check out before doing it this way. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Asphalt shingles can weigh up to four pounds per square foot depending on the brand.

Metal roofing weighs less than one pound per square foot. 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. However you ll want to check with your local building department before you make any decisions. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.