Screws or rivets???

[marshrunner757]

Originally Posted by keakar

depends but I like to put them in every rib and every 6 inches apart ant when I get to the ends I stay back from the end of the sheet by 2 inches to avoid and cracking or splitting from vibration.

it also is a good idea to put a small bead of silicone caulking on the ribs before you lay it down just in case there is a spot that is not level it wont move or have squeaks when you step there

I am putting a 3m rubber weather strip on every rib.