Installing Metal Roofing Over Existing Roof

Metal roofing is also available in the form of shingles.

Installing metal roofing over existing roof.

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. For exposed fasteners avoid over tightening the fastener. 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. If you have more than two layers of existing roofing material something s gotta give.

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. Inspect the condition of your current roof. How many layers are there. 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.

While metal roofs are routinely installed over existing shingle and asphalt roofs those existing roofs must be up to par for you to reap the long term benefits. How to install a metal roof over an existing 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. This provides a safer environment for both workers inside the building and the roofers as they install the new roof.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Yes you can install a metal roof over shingles. Lay a metal roofing panel over the existing roof material in the bottom corner of the roof surface and fasten to the roof according to. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

By using roof huggers the existing roof can be left in place. How to install a roof over an existing roof determine the feasibility. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. The condition of the existing roof is critical.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are. The roof should be in sound. With the existing roof left in place there are typically no leading edge safety issues.

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. Use your neoprene washer head screws to secure the metal to the sheathing.