How To Frame A Floor Over Concrete

These will be the end sill plates that support the ends of the floor joists.

How to frame a floor over concrete.

Install it flat on the slab surface with the outside edge aligned against the side wall or the edge of the floor line. Begin by cutting sheets to 16 inches by 8 feet or smaller panels marked 3 8 of an inch deep on back and a minimum of every 12 inches across in width. Treated plywood to the concrete with concrete screws spaced every 16 in. Don t worry about the gap.

Lay 6 mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. The floor is 4 inches lower than the adjacent kitchen floor. Stack three 2x4 blocks on the concrete floor at each stud location and measure the stud length for each stud along the wall by measuring from the string line down to the top of the blocks 1 block for the sill plate and 2 blocks for the top plate cut the studs to length making sure to keep them in their proper order. Plan is to open things up between the two knock out the old windows and the block wall.

We ll need some breathing room to make it fit. Alternatively screw rows of treated 1x4s to the concrete 16 in. We ll take care of that in step 3. When we build the frame on the ground we ll need to slide it vertically into place.

These folks have a sunroom which is built with concrete blocks concrete floor and old aluminum storm windows. Secure each length to the slab with concrete nails spaced approximately 32 inches apart and 8 to 12 inches from each end. The hard way nails or screws. Place 16 inch planks perpendicular or diagonal to direction of flooring.

Use a minimum 3 4 inch cd exposure 1 plywood sheathing 4 foot by 8 foot sheets. You can attach it directly to the concrete or install a subfloor first and then attach the floor to that. The most straightforward method is not to attach it but float the floor on top.