Originally Posted by
Bryan Dobson
Inch and a quarter length brass deck screws that sink below flush.(it’s been so long I no longer have the fastener box.) Can’t remember the diameter. I used 40or 50 you want to screw from the center seams outwards to work any bow out of the plywood laying the criss cross pattern.
You may want to set it on top of some horse stall mat to protect against possible moisture run off if any water could come in. I don’t know how high it is built up against water or if it is like a garage slab and above the driveway.