Putting Metal Roof Over Shingles

In terms of building codes many municipalities now have placed limits.

Putting metal roof over shingles.

How to install metal roofing over shingles issues you might encounter. 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. Metal roofs have a long history of use. However you ll want to check with your local building department before you make any decisions.

Installing metal roofing over shingles there are two primary methods implemented when installing metal roofing over shingles. 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. This allows the new underlayment to act as a line of defense in the event that water somehow gets under the metal roof. A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.

However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. Yes you can install a metal roof over shingles. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. This framework has three big advantages.

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 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. They have always been popular on barns commercial buildings and. 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.

Otherwise you will need to remove the shingles. The first is running new underlayment over an existing shingle roof thus covering the old roof. On has the metal expands and contracts due to weather changes the metal will actually move. 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.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens. Another added benefit is that the layers of your old roof will further insulate your home. Can i install a new metal roof over shingles. This method has its benefits as well.