Do you have to use tongue and groove plywood for subfloor?

For subflooring, you use tongue and groove plywood. The tongue and groove are only along the 8 foot edges. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove.

Is tongue and groove better for subfloor?

Tongue-and-groove plywood is superior to regular plywood for floor decks because it creates a stronger, more rigid subfloor, and helps eliminate sagging and “bounce” at the seams between the joists. But it is also more difficult to install because the tight-fitting joints don’t always go together easily.

Should tongue and groove plywood be glued?

The tongue or the groove does not need to be glued, although there is no reason not to. Some engineers require it in certain applications, but for standard subfloor applications none will be needed.

Why is plywood with tongue and groove preferred for flooring?

Plus, tongue and groove will help force a more level floor. Leaks have no bearing on why they are used. If you have ever lived with a non-tongue/grove plywood (or chipboard) subfloor, the answer will be obvious: it is to prevent squeaking, creaking, and grinding from people walking over it.

What kind of plywood to use for a subfloor?

The Wood The first thing to consider is what type of wood to use for the subfloor. Although OSB (orient strand board) is sometimes used, the most commonly used type of wood is C-D grade tongue and groove plywood. The C represents the grade of veneer on the front of the board and the D represents the grade of veneer on the back of the board.

Do you need to glue tongue to subfloor?

The tongue or the groove does not need to be glued, although there is no reason not to. Some engineers require it in certain applications, but for standard subfloor applications none will be needed. Again it is to your discretion also.

How many screws to use on tongue and groove plywood?

With glue you really can spread them out farther, 5 screws used on the ends if you choose, and 4 across the field. There are drills that are sold that use screws that have the screws collated in coils or strips. Makes this go much faster. Rental is an idea here.

What kind of subfloor do you need for tongue and groove?

Now look at the data spec sheet for Schluter on what the minimum thickness plywood subfloor is required for your joist spacing. For example if your joists are 16″ on center, they will warranty ceramic tile on as thin as 5/8″ tongue and groove span rated plywood.

What’s the best way to install tongue and groove plywood?

The plywood goes down so the groove is away from the wall, that way, after the row is finished, or at least when you decide to start the next row, a 2X4 can be placed across the joists at the edge of the next row and drive, with a sledgehammer, the second run into the first. The gap should be 1/8″ between ends.

Can You Lay ceramic tile over tongue and groove flooring?

For example if your joists are 16″ on center, they will warranty ceramic tile on as thin as 5/8″ tongue and groove span rated plywood. Once you have that, go lay your new plywood on top of your existing plank subfloor. Screw 4″ on center over the whole floor, and into the joists with stainless or coated deck screws.