Insulation Under Metal Roof Over Shingles

Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point.

Insulation under metal roof over shingles.

No matter it is an office or a home a layer of metal roof insulation will give you a lot of benefits. Technically there is no difference in the insulation value of a metal or shingle roof. Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation. Radiant barrier spray metal roof insulation adding the metal roof insulation can be done easily when you renovate your house.

Common problems with shingle roofs. Installed a new fully adhered membrane to the top of the old board sheathing prior to adding all that rigid insulation. The layer can be installed over the existing shingles new roof decking or simply over open rafters. Nail it around the edges with roofing nails.

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. Advantages of metal roofs over shingles. The reflective barrier insulation can also reduce your cooling cost during the summer months by reflecting heat away from your homes roof. Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.

Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Add a preinstalled membrane to absorb and release the condensation as it forms with the natural weather cycle. Disadvantages of metal roofs. Shingle roofs weight twice as much as a metal roof which means that it accumulates twice as much heat.

Insulate and try to keep from reaching the dew point. E foil or foil faced bubble wrap type reflective barrier insulation can also be used as a cushion between the existing roof and the new metal roofing. 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. This can be a nuisance for homeowners.

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. Adding additional layers of insulation can solve this problem but it will increase installation costs.