Installing Plywood To The Deck

Today the deck will start to become a deck again with the new plywood being installed. Once the old flooring is removed a deck can lose that “deck” feeling. It simply looks like a bare bones structure, which it kind of is.

Clearing The Joists For Plywood

Old joists have lots of imperfections that can prevent plywood from laying properly. On this deck, after removing the old flooring there are lots of old nails left over. Not only that but lots of dried glue. The top of a joist needs to be free from this problems to provide a total flat surface for the new plywood. I remove the old nails with a hammer or nail pull. The old method of pull or pound works here. Either pull the nails out or pound them flat with a hammer. Now that the joists are clear, its time to glue the plywood down.

Using Subfloor Glue For Adhesion And Silencing

Subfloor glue is used to connect plywood to the framing. This is applied from a caulking gun sufficiently along the top edge of the joist. We use PL400 subfloor glue by LePage, not only is one the best but most common used subfloor glue in North America. With the glue providing a strong adhesion, this also helps prevent squeaking underneath the wood once the screws are installed.

Mudding The Joints Between The Plywood

Using the tongue and groove option creates an extremely strong join between sheets. But for how strong this join is, it is near impossible to get zero gap. In these areas a wood filler compound is mixed and used to fill the gaps. This creates a flat surface for the vinyl membrane to attach to. Not only the gaps between plywood but some areas may have minor damage or knots that if left open will create a void between the plywood and vinyl. This will eventually lead to bubbles in the vinyl.

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