How To Overlap Corrugated Roofing

Use special roofing fasteners rather than standard screws to secure the corrugated sheets as they have a waterproof seal underneath the head that prevents leaks.

How to overlap corrugated roofing.

When walking across the width of the sheeting walk over or close to the roofing supports. To install corrugated roofing start by cutting your panels to length with an angle grinder. Metal sealing and fastening apply side lap sealant if the pitch of your roof is 2 12 or less. When joining panels you should use silicone sealant along their vertical length and overlap the sheets by one corrugation.

The overlaps ends and sides depends upon the sloop of the roof see below. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Fit the first sheet. Walk to one end of the roof and locate the seam where the first row of panels overlap the second row.

Climb up onto a ladder to access the corrugated panels using caution as you walk on them due to the wavy surface. Lay the remainder of the row. When laying the metal panels on the roof the overlap ridge of the new panel should straddle the underlap ridge of the panel before it. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses.

Continue onto the next rows. Step 2 insert a tube of butyl caulking into a caulk gun and snip the end off using sharp scissors. Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. Before you start to install corrugated metal roofing you need to figure out how much you need.

Purlin spacing should suit the end laps required for the size of sheet to be used. Install the roofing screws vertically along each rib in the panel. Measure the length of the. Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart.

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.