Insulation Under Metal Roof Over Shingles

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.

Insulation under metal roof over shingles. Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation. Advantages of metal roofs over shingles. Unlike most roofing materials metal roofs can be noisy especially when it rains or hails. The layer can be installed over the existing shingles new roof decking or simply over open rafters.

Disadvantages of metal roofs. Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it. Technically there is no difference in the insulation value of a metal or shingle roof. Add a preinstalled membrane to absorb and release the condensation as it forms with the natural weather cycle.

Insulate and try to keep from reaching the dew point. Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line. 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. Adding additional layers of insulation can solve this problem but it will increase installation costs.

Roof edge detail overhang extended to hide the thickness of the over roofing rigid insulation. Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Installed a new fully adhered membrane to the top of the old board sheathing prior to adding all that rigid insulation.

Shingle roofs weight twice as much as a metal roof which means that it accumulates twice as much heat. 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. No matter it is an office or a home a layer of metal roof insulation will give you a lot of benefits. 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. The reflective barrier insulation can also reduce your cooling cost during the summer months by reflecting heat away from your homes roof.