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1.Cut the panels to the length. Use either a circular saw or a jig saw with metal blades.

Most panels come up to 32 feet (9.8 m) in length. Allow for a minimum of 18 inches (45.7 cm) if you need to lap to complete the run.

2.Pre-drill holes on the ridges. Use a 3/16-inch (4.76 ml) drill bit.

Spacing for the holes on the ends and sides of the panels should be 6 to 8 inches (15.3 to 20.4 cm).

3.Install the panels. Place them directly onto purlins that are attached to the roof trusses, beginning on the outside edge.

Close or seal off the ends with a wood or plastic strip under the panel at each end. These will stop the entry of rain, wind and pests.

4.Screw down the panels. Pre-drill the holes, and use #10X2-inch (#10X5.2 cm) screws with polycarbonate washers.

Continue across the roof until it is completely covered, lapping over the previous panel by at least 2.5 inches (5.5 cm) minimum.

Adjust the lap so that the last panel completes the coverage without making a cut lengthwise.

5.Complete the opposite side. If your roof is two-sided (and not just a single slope), repeat the installation on the other side of the roof, and install a corrugated ridge cap as you proceed across with the panels.

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