I don't know for sure, but in the moist mornings you may get condensation on the plastic. I roofed my garage with the plastic corrugated sheeting, and had lines of drips where the battens were fixed, all along the floor and car. I had to remove the sheeting and put underfelt underneath. Top job now, that was about 12 years ago. The underfelt and plastic are still going strong. My garage is about 12' x 30', although it was built before I had my 90, so I had to remove the roof and door off the 90 to get it in to work on it..lol