Ok To Install Metal Roofing Directly Over Shingles

Otherwise you will need to remove the shingles.

Ok to install metal roofing directly over shingles.

This is by far the most common way to install a metal roof. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. 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. A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles. Yes you can install a metal roof over shingles.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. This method has its benefits as well.

3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof. Some jurisdictions require a full and complete tear off whenever a new roof is being installed. If you install metal over shingles if you do decide to install your new metal roof over your old shingles be sure to consult local building codes. In some areas building officials only allow a re roof over one layer of shingles.

In a standing seam roof long single panels run vertically all the way from the eave to the ridge. However you ll want to check with your local building department before you make any decisions. If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacturer has testing for their roofing panels and then the metal is installed to the purlins. If you don t want to take our word for it check with your local building department.