Proper Way To Install Metal Roofing Over Shingles

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.

Proper way to install metal roofing over shingles.

Step 5 install metal. A layer of underlayment installed on top of the existing shingles will help keep the granules of the old shingles from rubbing against the back of the metal and causing possible corrosion. 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. Laying steel roofing over shingles the right way.

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. Most metal shingles will be attached to the roof using metal shingle. Use 1 4 inch metal wood screws to attach the metal sheets to the wood slat board base. Space the screws about 12 in 30 cm apart.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Step 1 work safely. Install metal roofing sheets.

Step 2 measure roof. Step 3 install slat board. Step 4 install edging. For exposed fasteners avoid over tightening the fastener.

Metal roofing sheets have to be installed one at a time. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are. Brace your extension ladder.

Yes you can install a metal roof over shingles. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Choose a day with calm weather to work on the roof. 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.

However you ll want to check with your local building department before you make any decisions. Metal roofing is very slippery when wet.