Tips for Installing and Caring for Corrugated Plastic Roofs

white house with a roof

You can use corrugated plastic in many ways. It is formed after two plastic liners made from copolymer and high-impact polypropylene on either side of fluting fuse together. Together, these materials form a layer of chemical and weather-resistant sheet that can be used for roofing.

Use corrugated plastic roofing sheets when you replace or repair your roof because they are a low-maintenance and long-lasting alternative to metal sheets. The sheets are easy to work on and much lighter than corrugated metal roofing sheets. These makes corrugated plastic roofing sheets popular among homeowners who intend to save on the cost of hiring a professional roofer. You have to follow the instructions when installing a plastic roof to prevent leaks:

Roof Preparation

A corrugated plastic roof should have a one-inch pitch per foot to allow proper drainage. Homeowners whose roofs have a shallower angle may have to invest in additional waterproofing measures. Use moulding strips on the top of a corrugated plastic roof for an attractive and secure finish. Alternatively, attach the corrugated moulding strips on the horizontal cross-braces and the rounded ones on the vertical rafters. You can use galvanized nails to install the mouldings to prevent rusting and corrosion in case of any leak. Although this can be a time-consuming process, the use of a nail gun can make it significantly quicker.


Instead of screws, experts recommend using roofing fasteners to secure the corrugated sheets as they come with a waterproof seal underneath to prevent leaks. Roofers are recommended to use silicone sealants along the horizontal and vertical length of the corrugated roof and use one corrugation to overlap the sheets. Use enough sealants for better performance and to seal any gap or crack. Position the ladder securely and make sure that it doesn’t overstretch when fastening the sheets to prevent injuries. If possible, have a friend around to help you hold the ladder steadily.

Pre-drill Holes

using power drill on a roof

Installing a corrugated plastic roof can be quick and easy after drilling the holes for fasteners early enough. Aim to have the nails and bolts at the highest point of the corrugated plastic roof for stability. Your pre-drilled holes should be wider than the fasteners and 8 to 10 millimetres in diameter to create space for expansion of the roof during hot days. The best way to drill holes on a corrugated plastic roof is to use a stick that has a hole drilled in it.

Even after investing in a low-slope corrugated plastic roof, the work doesn’t end after installation. Your contractor might have to account for the value of maintenance and include the cleaning costs as well. Of course, every homeowner wants to keep their roof clean for maximum reflection and energy conservation benefits.

Corrugated plastic roofs are recommendable for various uses, including awnings, greenhouses, and homes. However, homeowners will need to clean their plastic sheets to restore their lustre and maximum efficiency. Homeowners also have to be careful and follow instructions when installing these roofs to prevent injuries and make sure that there are no cracks or gaps that might cause leaks down the road.

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