ᐅ Looking for Roofing Solution for Carport - OSB and Bitumen Membrane?

Hello everyone,

I have built a double carport (WEKA A1 Duo) as a terrace roof in the garden. Although a roof was supplied, I am not confident about it. It consists of thin corrugated PVC sheets. I would prefer to use something more durable as a roof...

Does anyone have experience with OSB tongue and groove boards and bitumen roofing sheets installed on top? Is this a suitable method? Or are there other inexpensive and appropriate alternatives for a carport roof?

Thank you in advance 🙂

Usually, EPDM membranes are used for carports, and the supporting structure depends on the spacing of the rafters. OSB boards look poor from below – tongue and groove planks are better.

Whatever you do, keep the structural stability of the carport in mind. The construction is designed for a lightweight roof. Wind load and, if applicable, snow load should not be underestimated. Therefore, I would initially trust the plastic roof and see how long it lasts.

Yes, please keep the structural stability in mind. The carport doesn’t look sturdy enough to support a heavy roof.

Our exit to the garden is covered with trapezoidal metal sheets, with tongue-and-groove boards underneath. It looks great – I’d also find that nice for a seating area. But it might be too heavy for your structure.

Regarding the bitumen membranes, you should be aware that especially in summer, under direct sunlight, they can sometimes emit an odor. Our carport roof is covered with corrugated bitumen sheets, and when the sun hits them, they do release a slight smell. That’s probably not a problem for a carport, but for a covered seating area...

If I were you, I would first install the supplied panels. You might also want to check at the hardware store for PVC panels that appear more robust but don’t necessarily add more weight.

You are right! I didn’t consider the structural engineering, especially since the carport only has 9x9 posts...

I will try the PVC roof first. I had also thought about using regular corrugated metal sheets, but I’m concerned it might be quite noisy when it rains...