Rafter Spacing For Corrugated Plastic Roofing

The overlaps ends and sides depends upon the sloop of the roof see below.

Rafter spacing for corrugated plastic roofing.

See 8 25mm polycarb some 20 yr warranty. 5 for ease of installation and an attractive design nail crossbraces between rafters using alternate spacing. You have to take the width of your roofing panel into the considerations. Corrugated sheet roofing material is widely available and easy to use.

Purlin spacing should suit the end laps required for the size of sheet to be used. Different profiles have different spanning capabilities. But they do tend to space rafters in one of several industry standard increments typically either 12 16 or 24 inches apart. Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart.

Nail round and corrugated molding strips to framing then paint or stain wood before installing panels. Greca 900 mm end spans and 1200 mm mid spans. Ensure the purlin spacing is not greater than 1 500mm. Screw the bottom half of the glazing bar to every purlin.

Sheet must be supported on all 4 edges minimum1 2 of sheet bearing on base or frame. Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. You will need to pre drill the glazing bar in preparation for fixing to the rafters at approximately 400mm centers staggered on alternate sides. To install corrugated roofing start by cutting your panels to length with an angle grinder.

For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses. On roof slope over 7 12 snow slides off. 4 attach rafters to header and crossbeam with 1 screws and nails.

This allows the panels to be securely attached to the rafters for maximum stability. Corrugated 800 mm end spans and 1000 mm mid spans. If using sheets cut along width and no longer have a rib at edge position so first rib supported by a minimum of 1 2. The below spans are given for a standard n3 wind rating if you are in a high wind area you may require additional fixings and structure call us to discuss.

The most common measurement used for rafter spacing is either 16 or 24 inches.