Installing Metal Roof Panels Over 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.

Installing metal roof panels over shingles.

Install metal roofing sheets. Place a sheet from top to bottom on a section of the roof. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 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.

Use 1 4 inch metal wood screws to attach the metal sheets to the wood slat board base. This method has its benefits as well. Metal roofing sheets have to be installed one at a time. 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. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.