Metal Roof Overlap Length

Common metal roof sheet sizes roofing panels come in many styles and dimensions with different overlap dimensions.

Metal roof overlap length.

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. Allow for a minimum of 18 inches 46 cm if you need to lap to complete the run. How to cut metal roofing never use a circular saw or other device that will fling hot metal chips all around the area you cut. Corrugated metal roofing generally comes in sheets that are 3x6 feet in size 18 square feet.

If you re installing a metal roof on a home without gutters you can overhang the panels by twice that amount. The most common lengths are 8 10 12 and 16 however many distributors will cut to length. Measure the length of the roof and the breadth of one side. There are various lengths widths and thicknesses available depending on your needs.

Length and width standard lengths for corrugated roofing are 8 10 and 12 feet. Multiply those numbers and then double the result for the square footage of your roof. Cut the panels to the desired length. Metal sealing and fastening apply side lap sealant if the pitch of your roof is 2 12 or less.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. The metal roof length calculator calculates the distance from peak to trim so add the length you want the roof metal to extend beyond the eave trim. In other words if the height of the roof drops by 2 inches for every 12 inches in length you will need to use sealant to strengthen the overlap barrier. Divide the square footage of your roof by 18 to give you the number of sheets you ll need.

On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. The most common widths are 24 and 36 exposed but the actual width of the panel will be larger to accommodate an overlap. We recommend about 2.