How To Install Metal Roofing On Top Of Shingles

Anatomy of a steel roof.

How to install metal roofing on top of shingles. I would say that in most cases less weight is being added to the home by the new metal roof than what the current shingles have lost due to granule wear and oil evaporation. Metal roof over shingles condensation. Codes vary so call your local building department to know how to install metal roofing over shingles properly code wise. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Experts recommend that you work diagonally and raising each row of shingles gradually. Then cover the entire roof with a layer of insulation and secure it with a staple gun. Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh.

Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it. By removing the old roof before the new roof s installation you are able to give the underlayment a thorough inspection to ensure there are no damages that could. Install the roofing screws vertically along each rib in the panel. You should start your metal shingles installation with half a shingle or in accordance with your metal shingles installation manual which should be system specific starting from the left of the starter flashing or gable.

You will need to lay some 1 by 4 inch pine boards lengthwise every two feet on your roof. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. Next use 1 inch nails to secure some metal edging to the perimeter of the roof. Install your metal edging around the perimeter of your roof.

Put the steel down directly on a vapor barrier. Install the metal edging. How to install a metal roof over shingles. 5install metal panels or shingles.

Use 1 1 4 inch. Make a slat board base on top of the shingles. 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. Before you install metal roofing repair any damage to the wood under the shingles.

What s involved in how to install metal roofing. 3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof.