Installing Metal Shingles Over An Existing Roof

There are really two ways to install a metal roof over a shingle roof.

Installing metal shingles over an existing roof.

How to install a metal roof over shingles. Make a slat board base on top of the shingles. Your goal with the roofing felt is to make sure everything is as. The vast majority of installations of the metal roofing systems produced by my company are over existing 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. Getting an accurate measurement will help you determine the. 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. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

Start putting the metal panels. This provides a couple of benefits. 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.

Lay down roofing felt over the entire roof. Install the metal edging. The low weight of metal roofing is one thing that encourages this. 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.

Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh. 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. The first way is to run new underlayment over the existing shingle roof completely covering the old roof. Install your metal edging around the perimeter of your roof.

Step by step guide step 1. Use 1 1 4 inch. You must put in a completely new underlayment over the existing shingles before you carry out any installation. 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.

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. 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. Can i install a new metal roof over shingles.

Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Get a precise measurement of your roof surface.