Step 1

continue to remove old flooring

Remove the Old Underlayment

Use a hammer and pry bar to lift and remove the old underlayment.

Pro Tip

You may want to rent a take-up or roofing shovel to assist with removing the luan. The cost is approximately $30 a day. They are easy to use. Simply get underneath the underlayment with the shovel and lift.

Step 2

Apply the Thin-Set Mortar

Once the underlayment is up, you'll need to treat the floor to get rid of the stickiness of the adhesive. Do this by spreading a layer of dry thin-set mortar product over the floor. Move the thin-set around using a broom. You want just an even dusting over the floor to eliminate stickiness under the new flooring. Sweep up the excess.

Step 3

tack felt down to subfloor with staple gun

Add the Rosin Paper

Once the powder is down, cover the entire floor with rosin paper. Using a utility knife cut the paper to fit and tack it into place with a hammer tacker and staples.

Step 4

Start Laying the Underlayment

Measure the square footage of the room and get the underlayment material. Start with the longest straight run or edge of the room, using as many whole sheets as possible. Full sheets assure a good snug seam because you are dealing with two factory-finished edges.

Step 5

Create a Pattern

After the first row is done go back to do the next. This time you will want to start with a 1/2 sheet so the seams are staggered. Lay the sheets in a brickwall-like pattern.

Step 6

Attach the Sheets

Use a jigsaw to make cuts around the trim, pipes, etc. and staple the sheets down using a pneumatic stapler and 1-1/4" galvanized staples.

Step 7

laying luan plywood over existing subfloor

Put Extra Staples Around the Edges

Start in the most outside corner of the sheet working inward so no bubbling occurs. Sheets are marked with X's so you know where to staple them. You will need to put extra staples around the edges.

Pro Tip

Always use galvanized staples for underlayment so they won't rust.