Once the framing has been taken care of, its time to add subfloor to the deck. On this deck we will be laying 3/4″ plywood as the subfloor. Plywood comes in different thicknesses, but for this job we are using 3/4″ which is plenty strong enough. We are laying Tufdek vinyl flooring membrane on the deck. This type of vinyl flooring is a great and affordable option and its extremely tough. Great for the harsh weather we get here in Vancouver.
The subfloor being used here is a type of plywood called Tongue and Groove. On one edge of the sheet is what’s called a tongue. This is a small extension that sticks out along the edge roughly around 1/8″ thick. On the other side of the plywood there is a groove along the edge. This tongue and groove interlock with each other when being laid and create strength where normally there would be weakness.
The plywood is all cut to size so that each end of the sheet lands on a joist and can be shared with the next sheet. Before screwing down the plywood to the joists, a bead of Subfloor Glue is applied to help adhesion and also help prevent squeaking in the deck. The subfloor glue we used here is LePage PL400. It comes in a tube which is coupled with a caulking gun to apply.
With the plywood glued and screwed down, the edge of the deck is routered to install a metal flashing. This flashing helps divert water away from the deck once it rolls off the edge. The metal flashing has a small drip edge at the bottom to do this. Next the seams are filled with wood filler/mud and sanded flat to prevent sinking. Once the deck has been prepped, the next step is to lay vinyl.