Metal Roof Over Shingles Insulation

Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.

Metal roof over shingles insulation.

Roof edge detail overhang extended to hide the thickness of the over roofing rigid insulation. Technically there is no difference in the insulation value of a metal or shingle roof. Metal roofing weighs less than one pound per square foot. Advantages of metal roofs over shingles.

This is different from the normal roll up type of insulation as it comes in panels rather than paper covered fiberglass. The second way to install a metal roof over a shingle roof is with the use of purlins or battens. Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Adding additional layers of insulation can solve this problem but it will increase installation costs.

This foam can be used on either the outside or the inside of the sheathing. Unlike most roofing materials metal roofs can be noisy especially when it rains or hails. Shingle roofs weight twice as much as a metal roof which means that it accumulates twice as much heat. 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.

Installed a new fully adhered membrane to the top of the old board sheathing prior to adding all that rigid insulation. 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. The best material for use with metal roof insulation is in the form of foam batting. No matter it is an office or a home a layer of metal roof insulation will give you a lot of benefits.

The layer can be installed over the existing shingles new roof decking or simply over open rafters. A shingle style roof is the most popular choice. This can be a nuisance for homeowners. If you don t want to take our word for it check with your local building department.

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. Common problems with shingle roofs. Disadvantages of metal roofs. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof.

Metal is the best choice due to its very low weight per square foot and its unique design. This method has its benefits as well.