Installing Metal Roof Over Old Metal Roof

Should old shingles be removed before new installation.

Installing metal roof over old metal roof.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. March 11 2020 by safe harbor roofing reroofing is the practice that involves installing a new roof over an existing one. Install drip edge drip edge or edge metal is a piece of metal that extends approximately 0 75 inch beyond the roof s edge to channel runoff into your gutters. 1 remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof.

Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line. 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 the metal panel instructions. To install it slide the flat wide. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof.

Metal roofing materials are available in several styles that require different fastening applications but are most commonly screwed to the roof framing or sheathing material which in the case of installing over existing roofing material should be fastened using 2 1 2 inch screws. Your metal trim will go along the roof s edges as well as the top ridge. Install with 1 4 inch metal wood screws at a distance of every two feet. Install the metal trim.

Cool outside air then travels under the shingles to the vented ridge detail 2 pulling out moisture and heat. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Install the roofing screws vertically along each rib in the panel. Metal over metal retrofit considerations there are a number of issues a roofer will have to deal with when it comes to metal over metal retrofits but listed below are a few where the use of a roof hugger.

To vent the roof holes are cut in the old roof detail 1 above the soffit which pulls air through the soffit vents underneath. Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.