Metal Roof Over Shingles Insulation

Common problems with shingle roofs.

Metal roof over shingles insulation.

Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it. Roof edge detail overhang extended to hide the thickness of the over roofing rigid insulation. Shingle roofs weight twice as much as a metal roof which means that it accumulates twice as much heat. Radiant barrier spray metal roof insulation adding the metal roof insulation can be done easily when you renovate your house.

Metal is the best choice due to its very low weight per square foot and its unique design. Unlike most roofing materials metal roofs can be noisy especially when it rains or hails. While metal roofs are efficient at its ability to resist heat transfer it is exposed and absorbs just as much heat as a shingle roof. The layer can be installed over the existing shingles new roof decking or simply over open rafters.

By placing metal roofing over shingles you can save in the labor costs of ripping them off while also preventing them from being thrown into landfills. Disadvantages of metal roofs. Adding additional layers of insulation can solve this problem but it will increase installation costs. The second way to install a metal roof over a shingle roof is with the use of purlins or battens.

The best material for use with metal roof insulation is in the form of foam batting. Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Technically there is no difference in the insulation value of a metal or shingle roof. If you don t want to take our word for it check with your local building department.

This foam can be used on either the outside or the inside of the sheathing. This can be a nuisance for homeowners. 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. This is different from the normal roll up type of insulation as it comes in panels rather than paper covered fiberglass.

Advantages of metal roofs over shingles. Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. This method has its benefits as well.

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. A shingle style roof is the most popular choice.