How Much Over Lap On Metal Roofing

If end laps are required you should allow 300mm minimum overlap sealed with butyl sealant tape 10mm from the edge of each overlapping sheet as well as in the middle of the overlap.

How much over lap on metal roofing.

Common metal roof sheet sizes. How to overlap corrugated metal roofing. Roofing panels come in many styles and dimensions with different overlap dimensions. Any end laps must be supported by a suitable purlin.

If you re installing a metal roof on a home without gutters you can overhang the panels by twice that amount. The panels overlap allowing water to flow from one panel to the next without being able to penetrate the area under the roofing panel. Metal roofs are lightweight easy to install and much more fire resistant than asphalt shingles. Here phil explains how much overhang a roof should have at the gutter.

On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. The sheets should overlap by at least four inches add a bead of caulk where they overlap and at the other end of the building ensure there s an overhang of two inches. The most common widths are 24 and 36 exposed but the actual width of the panel will be larger to accommodate an overlap. Once the first sheet is in place you need to install the remainder of the lowest row of corrugated metal roofing.

The most common lengths are 8 10 12 and 16 however many distributors will cut to length. Install metal panels or 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. Install the roofing screws vertically along each rib in the panel. Installing corrugated metal roofing will require you to lap the m.

When you are overlapping the metal ridge cap have the laps facing the opposite direction of the sight line of your metal roof. How to overlap ridge cap on a metal roof ridge cap is typically ten feet to twelve feet in length and most roofs will be larger than twelve feet. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. When this happens the ridge cap will need to be overlapped.

Overlapping anti condensation lined sheets.