Installing Metal Shingles Over An Existing Roof

The first way is to run new underlayment over the existing shingle roof completely covering the old roof.

Installing metal shingles over an existing roof.

However you ll want to check with your local building department before you make any decisions. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. You will need to lay some 1 by 4 inch pine boards lengthwise every two feet on your roof. Getting an accurate measurement will help you determine the.

Another added benefit is that the layers of your old roof will further insulate your home. Yes you can install a 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. Make a slat board base on top of the shingles.

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. 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. 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.

Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Start putting the metal panels. The vast majority of installations of the metal roofing systems produced by my company are over existing shingles. Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh.

Step by step guide step 1. Your goal with the roofing felt is to make sure everything is as. Install the metal edging. 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.

How to install a metal roof over shingles. Use 1 1 4 inch. 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. The low weight of metal roofing is one thing that encourages this.

Lay down roofing felt over the entire roof. There are really two ways to install a metal roof over a shingle roof. You must put in a completely new underlayment over the existing shingles before you carry out any installation. This will help prevent water leakage and provide a buffer between the metal roof and the existing shingles.

Get a precise measurement of your roof surface. 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.