How To Install Standing Seam Metal Roof Over Shingles

In contrast steel shingles are small panels installed in horizontal rows much like other shingles.

How to install standing seam metal roof over shingles.

This is by far the most common way to install a metal roof. The system is designed around the patent pending 138t shingle recover clip and 138t symmetrical standing seam panel. In contrast standing metal seam solutions can only withstand winds up to 80 miles per hour. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

This method has its benefits as well. Snap the panels together and fasten along the opposite side and top of the panel. Mcelroy metal has introduced a method for installing standing seam metal roofing directly over asphalt shingles without a tear off. If you want to install steel over asphalt your best choice is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel.

The main challenges when installing a metal roof directly over shingles with no underlayment are clip alignment and abrasion on the underside of. 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. Better steel shingle systems like the one shown install over a framework of 2x2s. Place sealant over underlap rib before sliding hem over the eave trim.

In a standing seam roof long single panels run vertically all the way from the eave to the ridge. The second way to install a metal roof over a shingle roof is with the use of purlins or battens. Unlike steel and aluminum shingles standing seam panels should not be installed over the existing asphalt shingles. Make sure roof is square.

Snap first two to three inches of panel together and slide the panel tight against the eave trim or with the gap depending on the temperature. Complete and separate roofing systems such as standing seam metal roof systems that are designed to transmit the roof loads directly the buildings structural systems and that do not rely on existing roofs and roof coverings for support shall not require the removal of existing roof coverings. There are two main reasons. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

First of all if you install a standing seam metal roof over asphalt shingles there will be a so called telegraphing effect where shingles can punch horizontal lines in standing seam panels.