How to Refinish Hardwood Floors

Refinished hardwood floor in downstairs bedroom.

When Y and I lived in Atlanta, our house had a downstairs bedroom that we used for an office. However, it was an odd room. The kitchen and downstairs bathroom had tiled floors, and the rest of the downstairs–dining room, living room, and den–had hardwood floors. That downstairs bedroom had medium pile carpet. When our friend Masaya asked if he could visit us, we thought it was a good opportunity to refinish the downstairs bedroom as a guest room with hardwood floors. Here’s how we refinished its floor to match the stain of the rest of the downstairs.

First, I pulled up the carpet in the closet and a corner of the room to verify that it was the same kind of oak flooring as the rest of the downstairs. Having verified this, I began cutting and rolling the carpet and padding.

Refinishing a carpet covered hardwood floor. First, remove the carpet and padding.

The padding had been glued down–thankfully not over the entire floor–but enough that I had to scrape some of it and the glue off the wood flooring using a paint scraper. However, I went slow and carefully to make sure that I didn’t gouge the wood with the tool. Whatever I didn’t get up, I knew that I could sand down eventually.

Refinishing a carpet covered hardwood floor. Second, scrape the carpet padding and glue off the wood floor.

Then, I used a hammer to pull up the carpet tack strips around the edges of the room and vacuumed the floor clean.

Refinishing a carpet covered hardwood floor. Third, pull up the carpet tack strips and vacuum the floor clean.

For the next step, I went to the local Home Depot Rental Office to rent a stand-up belt sander for floors. This thing weighed about 100 pounds. It’s weight combined with a handle operated mechanism to engage the sanding belt against the floor and pull it forward made quick work of sanding the floor and removing all old paint, glue, and stains. As the wood wasn’t in too bad of shape, I used a fine grit sandpaper. Also note that when you use a floor sander like this, you want to move in the direction of the boards and give each pass a little overlap for an even finish across the whole floor. Also, you can see that I have the windows open. Even though the sander has a bag to catch the sawdust, it can’t catch it all. Open your windows and cover outlets and air returns to keep that dust from getting into places it shouldn’t be.

Refinishing a carpet covered hardwood floor. Fourth, use a belt sander to sand most of the floor's surface.

Halfway through, I changed out the belt for a fresh one. This probably wasn’t necessary, but I might have noticed some change in the sanded floor’s finish by this point in the project.

Refinishing a carpet covered hardwood floor. Changing the floor belt sander's sandpaper belt.

After using the belt sander over the whole floor, I saw some spots that needed additional work. When I did these spots, I went over the entire run as just using it in one spot might leave a dip in the floor. As I worked, I used the shop vac to keep the floor as clean as possible from the extra sawdust produced by the sander. And, around the edges of the room and inside the edges of the closets, we used a handheld orbital sander and sanding blocks to sand the 2″ or so on all sides that the belt sander was unable to reach due to its design.

Refinishing a carpet covered hardwood floor. Fifth, use a belt sander to sand troublesome spots but cover the entire run to avoid dips.

After returning the belt sander to Home Depot, we cleaned the floor again and applied water to the wood with cloths to “pop the grain.” This makes the wood more receptive to the stain so less is needed to achieve the results that you want.

Refinishing a carpet covered hardwood floor. Sixth, just before applying the stain or stain/poly combo, get the floor damp to "pop the grain."

Before, we had taken photos of the existing hardwood floors in the house using natural light to capture the best image of the stain. We took this to Home Depot and matched it to a water-based stain and polyurethane combo so that we could finish the floor as soon as possible and give it time to cure and air out before moving furniture back in anticipation of our friend’s arrival.

With the wood damp, I stirred the stain/poly combo according to the instructions on the can and poured out some into a paint tray. Then, I dipped a foam paint/finish applicator into the stain/poly and gently worked it into the wood in the direction of the boards.

Refinishing a carpet covered hardwood floor. Seventh, stir the stain/poly combo according to the directions, pour it into a paint tray, and work it into the wood in the direction of the boards..

Once completed, give the floor enough time to air out and cure before moving things back in. If you don’t have to walk on it, just wait until its met the cure time as this will give you the strongest possible finish.

Refinishing a carpet covered hardwood floor. Eighth, give the finished floor enough time to air out and cure.

I didn’t want to pull up the baseboard, so I went back after the floor’s finish had cured and repainted the baseboard (putting down plastic, taping the edge, and putting enough coats to hide the stain that hit it). In hindsight, I should have taped the baseboard to protect it. However, the best option is to pull up the baseboard and reinstall after refinishing the floor.

We were very happy with the results. It was ready for our friend’s visit and we used it as an office again after he returned to Japan.