How To Install Metal Roofing Over Shingle Roof

Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh.

How to install metal roofing over shingle roof.

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. 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. 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. Make a slat board base on top of the shingles.

Installing metal roofing over shingles is the best solution. Install your metal edging around the perimeter of your roof. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. You will need to lay some 1 by 4 inch pine boards lengthwise every two feet on your roof.

Use 1 1 4 inch. The vast majority of installations of the metal roofing systems produced by my company are over existing shingles. The low weight of metal roofing is one thing that encourages this. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

In a standing seam roof long single panels run vertically all the way from the eave to the ridge. Install the metal edging.