Sheet Metal Roof Over Shingles

Replacing shingles with metal roofing is not necessarily difficult but it will require labor and time.

Sheet metal roof over shingles.

However you do have the option of leaving the shingles in place and installing the roofing over them if the roof is in good shape. Otherwise you will need to remove the shingles. Screw the first sheet in the center as well as the edges. Screw the metal sheets into the slat board with a wood screw every 2 feet along the edges.

Take care the first piece is aligned precisely perpendicular square to the edge. Metal roofing 25 30 in. Most codes now allow no more than two layers of roofing before requiring a complete tear off. 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.

3 wide rib panel. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. Overlap the rises and dips if using corrugated sheets or lay flat sheeting with a slight vertical overlap. By jamie lisse a metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.

Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. So if your roof has two layers it may require a complete tear off even though steel is lighter than asphalt. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Metal roofing 3x10 drip edge white corrugated tin.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Metal roofs generally can run from 120 to 900 per 100 square feet one 10 foot by 10 foot area or a square of material while asphalt shingles will be between 100 and 200 per 100 square. Space the screws about 12 in 30 cm apart down the entire piece of metal. Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 4 in 1 9 cm.

Metal roofing weighs less than one pound per square foot. Sheet metal metal roof panels 12 ft. Use your neoprene washer head screws to secure the metal to the sheathing. If you don t want to take our word for it check with your local building department.

Codes vary so call your local building department to know how to install metal roofing over shingles properly code wise. The removal itself could cost anywhere from 3 to 5 per square foot. Asphalt shingles can weigh up to four pounds per square foot depending on the brand.