If your layout matches your math that is what will happen. 3/4 of an inch is plenty enough. If you get a little hesitant you can always "scab" a 2 by 4 along side the joist. Scab is a term used to join a board along side another when it wasn't called for in the beginning.
To make sure there aren't any squeaks, I like to use construction adhesive. It comes in tubes like calk and a nice bead down the center of a joist will make sure you won't have to worry about the plywood moving when you nail it in place. Since this is overhead you can lay the plywood down first and put a couple scraps of wood under one edge to raise the sheet enough to get the tip of the tube under it. You'll have plenty of time to adjust the sheet back in place before the adhesive starts to dry. You shouldn't have to worry about trimming the sheets with the dimensions you are using. ----- Original Message ----- From: Larry Stansifer To: [email protected] Sent: Friday, January 11, 2008 10:51 AM Subject: [BlindHandyMan] Finding the centers What is the best way to locate the 16" joist centers once you have the plywood laid out. I have a number of ideas however none of them have been tried and I'm not looking to reinvent any wheels. If my math is correct it will be necessary to split the third joist thickness in order to accommodate the edges of both sheets of plywood. Does this mean I need to trim off a given amount of material on each sheet prior to fitting it? Is an inch more or less on that third joist sufficient to fasten the adjoining edges of the plywood? What do I do to keep from building in a squeak where the plywood edges butt up? [Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
