Seams On Top Of Joist Plywood On Floor

On the four foot edges your seams will fall on joist tops so no need for tongue and groove.

Seams on top of joist plywood on floor.

The tongue and groove are only along the 8 foot edges. Laying your first piece in the outside corner of the floor you want the long dimension of the plywood to lay across six joists with the final edge ending up in the center of the 6th. Then screw through the block into floor. A screw gun is the quickest and most efficient way to insert the decking.

But to start off we will need to remove the tongue so the plywood is tight with the exterior icf walls. Floor is still up but is reinforced as strongly as it if was resting on the joist. Screw the block to the joist first. When installing decking you should lay the pieces so the long dimension of the plywood extends across the joists and the short dimension runs up the joist length.

For subflooring you use tongue and groove plywood. By sealing these seams moisture insects dust and air can t permeate into a home. Apply adhesive on two sides of the block and position it along the side of the joist under the loose squeaky area so that it is in contact with the joist and the floor. When the sheets are secure spread thinset mortar on the seams cover it with fiberglass cementboard joint tape and trowel another layer of thinset on top of the tape as if you were taping drywall seams.

Unsealed seams diminish the effectiveness of the cooling and heating systems of a home which can adversely affect utility costs.