Metal Roof Over Shingles Insulation

The best material for use with metal roof insulation is in the form of foam batting.

Metal roof over shingles insulation.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens. 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. This is different from the normal roll up type of insulation as it comes in panels rather than paper covered fiberglass. Roof edge detail overhang extended to hide the thickness of the over roofing rigid insulation.

Common problems with shingle roofs. A shingle style roof is the most popular choice. Disadvantages of metal roofs. Installed a new fully adhered membrane to the top of the old board sheathing prior to adding all that rigid insulation.

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. Advantages of metal roofs over shingles. Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Unlike most roofing materials metal roofs can be noisy especially when it rains or hails.

Metal is the best choice due to its very low weight per square foot and its unique design. Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it. This foam can be used on either the outside or the inside of the sheathing. The layer can be installed over the existing shingles new roof decking or simply over open rafters.

If you don t want to take our word for it check with your local building department. Technically there is no difference in the insulation value of a metal or shingle roof. 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. Radiant barrier spray metal roof insulation adding the metal roof insulation can be done easily when you renovate your house.

Metal roofing weighs less than one pound per square foot. 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. This can be a nuisance for homeowners. Shingle roofs weight twice as much as a metal roof which means that it accumulates twice as much heat.

Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation. Adding additional layers of insulation can solve this problem but it will increase installation costs.