CONSTRUCTION

1) Seal concrete slab

2) Precut 2x4s

3) Glue foam blocks to 2x4

4) Screw together 2x4 frame using hardware

5) Level blocks

6) Cut plywood into sections to stagger seams

7) Screw plywood onto frame

8) Fill or tape all seams and holes

Note: It is extremely important that you water seal exposed concrete prior to building your subfloor.

DIRECTIONS
Build frame using standard 2x4 lumber set on the 2" edge. The circumference of your subfloor should be measured 1/2" in from the walls. Every 16" on center, (measured from the middle of a 2x4) a new 2x4 will run the width of the room. Precut the 2x4 that run across the width of room taking into consideration the width of the 2x4s that will be running along the lengths of your room (See illustration 1). Join 2x4s together for needed length using extenders designed for this purpose. Use contact cement or liquid nails to glue foam blocks every 6" on center and under every joint (from center of one foam block to center of next foam block \u2013 there will be a 4" space between the edge of one foam block to the edge of the next foam block [See illustration 2]). Glue blocks on to the bottom of all 2x4s by applying glue to both the 2x4 and the foam block. After the blocks have been secured, screw the 2x4 frame together using construction clips and 1-1/2" wood deck screws. If necessary, level the frame by trimming foam blocks or by wedging them where the slab dips. Using 1-1/2" wood deck screws, attach your 4' x 8' sheets of plywood to the frame. Stagger the plywood seams by cutting different lengths. Each 8' edge of plywood must line up in the middle of a 2x4. Plywood seams that are parallel to 2x4s must be directly over a 2x4. Tongue-in-groove plywood, meeting the same specifications, can also be used. Countersink screws and tape or fill all seams and screw holes to realize a smooth surface.

Note: Door clearances and location of electrical outlets or cabinets may need to be adjusted.

Note: You must use underlayment grade plywood, no voids, finished one side. Not all subfloor surfaces (other than plywood) are compatible with adhesive. Discuss your options with Stagestep technical support. Fill all screw holes and seams with a latex base floor patch (Sand all patching) to ensure smooth surface for application of top flooring. Caution: If you plan to remove and recycle you subflooring at a future date, do not fill screw holes or seams. Tape over them for easy removal later.

Note: If you plan to remove and recycle your subflooring at a future date, do not fill screw holes. Tape over them for easy removal later.