On the other hand a maximum is around 8 11 inches 20 30cm.
How many inches to overlap metal roofing panels.
See page 6 for more information on screw spacing and ordering.
Otherwise 1 inch screws can be used.
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.
A standard minimum for a sheet of metal placed on the roof so that it overhangs the edge is at least of an inch to 1 inch 2 2 5cm.
How to overlap corrugated metal roofing.
For best results use 14 x 7 8 lap screws at panel overlaps.
A specially washered screw applied through the flat of the metal is the most recommended method used to attach roofing panels.
Install the roofing screws vertically along each rib in the panel.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
Continue across the roof until it is completely covered lapping over the previous panel by at least 2 5 inches 6 4 cm minimum.
If you re installing a metal roof on a home without gutters you can overhang the panels by twice that amount.
The most common widths are 24 and 36 exposed but the actual width of the panel will be larger to accommodate an overlap.
If it s longer than this external supports are usually required.
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.
Metal sealing and fastening apply side lap sealant if the pitch of your roof is 2 12 or less.
For installation into a steel frame use 12 x 1 minimum self drilling screws.
Roofing panels come in many styles and dimensions with different overlap dimensions.
The most common lengths are 8 10 12 and 16 however many distributors will cut to length.
Make sure the panel is square to the roof line.
On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches.
If you wish to pre drill fastener holes use a cover sheet to prevent hot metal shavings from sticking to panels.
Learn how much to overlap the corrugated sheeting.
It is recommended that you cut panels upside down using a nibbler.
