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Use a hammer and pry bar to lift and remove the old underlayment.
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.
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.
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.
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.
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.
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.
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.
Tip: Always use galvanized staples for underlayment so they won't rust.
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