Installing Metal Roof Panels Over Shingles

The second way to install a metal roof over a shingle roof is with the use of purlins or battens.

Installing metal roof panels over shingles.

Use 1 4 inch metal wood screws to attach the metal sheets to the wood slat board base. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Most metal shingles will be attached to the roof using metal shingle. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Metal roofing sheets have to be installed one at a time. 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. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

Install metal roofing sheets. Yes you can install a metal roof over shingles. 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 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.

This method has its benefits as well. Place a sheet from top to bottom on a section of the roof. It provides a solid flat surface to attach the new metal roof to it creates an air gap between the back of the metal and the shingle roof which allows for airflow.