Putting Metal Roof Over Shingles

Metal roofs have a long history of use.

Putting metal roof over shingles. This framework has three big advantages. How to install metal roofing over shingles issues you might encounter. Can i install a new metal roof over shingles. 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.

Installing metal roofing over shingles there are two primary methods implemented when installing metal roofing over shingles. The first is running new underlayment over an existing shingle roof thus covering the old roof. Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles. Another added benefit is that the layers of your old roof will further insulate your home.

On has the metal expands and contracts due to weather changes the metal will actually move. If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel. In terms of building codes many municipalities now have placed limits. This allows the new underlayment to act as a line of defense in the event that water somehow gets under the metal roof.

First because the frame is screwed directly to the rafters and the interlocked shingles are screwed to the frame the roof can withstand winds of up to 120 mph without damage. Yes you can and by doing so you save in the labor and hassle of tearing off the old roof and you won t be contributing to filling our landfills. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. Better steel shingle systems like the one shown install over a framework of 2x2s.

Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Otherwise you will need to remove the shingles. Can you put metal roof over shingles the reason why this is important is because a shingle roof is granulated very similar to sandpaper. Yes you can install a metal roof over shingles.

However you ll want to check with your local building department before you make any decisions. 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 second way to install a metal roof over a shingle roof is with the use of purlins or battens. This method has its benefits as well.