Installing Metal Shingles Over An Existing Roof

How to install a metal roof over existing shingles start with an underlayment over the existing shingles.

Installing metal shingles over an existing roof.

Install the metal edging. However you ll want to check with your local building department before you make any decisions. 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. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

The low weight of metal roofing is one thing that encourages this. Use 1 1 4 inch. Install your metal edging around the perimeter of your roof. The first one being that the new underlayment will act as a second line of defense in case water would to somehow get underneath the metal roof.

Getting an accurate measurement will help you determine the. Start putting the metal panels. Yes you can install a metal roof over shingles. There are really two ways to install a metal roof over a shingle roof.

This synthetic underlayment acts as a vapor barrier and a slip sheet the slip sheet allows the metal roofing to expand and contract without damaging the finish coating on the. Can i install a new metal roof over shingles. Get a precise measurement of your roof surface. Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh.

How to install a metal roof over shingles. This provides a couple of benefits. The primary method for installing a metal roof over asphalt is to fasten a synthetic underlayment atop the existing shingles and then lay the metal roof over that. Lay down roofing felt over the entire roof.

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. 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. 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. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof.

Another added benefit is that the layers of your old roof will further insulate your home. You will need to lay some 1 by 4 inch pine boards lengthwise every two feet on your roof. The first way is to run new underlayment over the existing shingle roof completely covering the old roof. This will help prevent water leakage and provide a buffer between the metal roof and the existing shingles.

You must put in a completely new underlayment over the existing shingles before you carry out any installation. Step by step guide step 1.