Refinishing Hardwood Floors

Learn how to restore and refinish hardwood floors in your home with these home improvement tips from the pros.

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Finishing a wood floor requires a number of preparation steps, but the result is a wood floor with all its warmth and richness.

If you're planning to refinish an existing floor, pull up a floor register to make sure you have enough wood for another sanding. Standard hardwood strip flooring can be sanded several times, but if your floor is only slightly more than 1/2 inch thick, consult a professional. The same goes for engineered flooring. It can be refinished, but its top layer is quite thin.

Take inventory of the existing floor, and mark and repair popped nails and damaged areas. Because depressions in an old floor are inevitable, they'll show up as you're sanding them. Mark them so you can re-sand them if necessary.

Even if your floor is brand new and unfinished, it will require sanding and preparation. In almost all cases, it's easier to use a pad sander rather than a drum sander.

Pre-Start Checklist

Time
2-4 days, depending on conditions and size of the floor, as well as your skills and experience

Tools
Pry bar, putty knife, hammer, pad sander, random orbit sander, vacuum, finish applicator, paintbrush

Skills
Preparing, sanding, and finishing wood

Materials
Finishing nails, wood putty, stain, sandpaper, varnish

How to Refinish Wood Floors

1. Remove shoe molding and baseboard (if desired). Rough-sand the floor with a heavy-grit paper, keeping the sander moving and working with the grain. Change sandpaper often to keep the cutting surface fresh. A sander equipped with a dust-removal system will speed the work.

Shoe molding (and baseboards) invariably suffer damage from the sanding machine. To avoid replacing the moldings and baseboards with new material (which will also require finishing), remove them with a flat pry bar.

2. When the floor is sanded to a rough-cut smoothness, fill the entire surface with a wood filler as recommended by your floor-products retailer. Let the filler dry.

3. Rough-cutting the floor will leave the edges slightly higher than the main body of the floor. To even out this difference in floor levels, scrape down the edges so they're level with the sanded surface. Change blades often, and pull the scraper toward you with firm pressure on the wood.

4. Buff the floor with a 100-grit screen to remove any remaining imperfections and to bring the floor to a consistent level from edges to center, leaving the surface at its finished smoothness. Vacuum thoroughly and remove dust with a tack cloth.

Drum sanders require a specific technique to produce a smooth surface. Start about two-thirds of the way along the length of one wall and sand with the grain, pulling the sander toward you. Then push the sander forward and overlap its next path slightly. After sanding the section, turn the sander around and repeat the process.

5. Stain the floor (optional) with a rag or the applicator recommended, removing the excess, if necessary. Let the stain dry. Using a lamb's wool or other suitable applicator, apply the finish coats, letting each coat dry. Scuff-sand and vacuum each dry coat before applying the next one.

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