Installing Metal Roofing On Top Of Shingles

How to install a metal roof over shingles.

Installing metal roofing on top of shingles.

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. Most metal shingles will be attached to the roof using metal shingle. Install the metal edging. The second way to install a metal roof over a shingle roof is with the use of purlins or battens.

Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh. However you ll want to check with your local building department before you make any decisions. Use 1 1 4 inch. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacture has testing for their roofing panels and then the metal is installed to the purlins. Install your metal edging around the perimeter of your roof. I would say that in most cases less weight is being added to the home by the new metal roof than what the current shingles have lost due to granule wear and oil evaporation. Make a slat board base on top of the shingles.

Yes you can install a metal roof over shingles. 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. You will need to lay some 1 by 4 inch pine boards lengthwise every two feet on your roof. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.

This method has its benefits as well. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. This is by far the most common way to install a metal roof.