Installing Metal Roof Panels Over Shingles

Use 1 4 inch metal wood screws to attach the metal sheets to the wood slat board base.

Installing metal roof panels over shingles.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Install metal roofing sheets. 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.

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. 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. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. This method has its benefits as well.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. 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. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof.

Place a sheet from top to bottom on a section of the roof. The second way to install a metal roof over a shingle roof is with the use of purlins or battens. Most metal shingles will be attached to the roof using metal shingle.