September 21, 2023

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The Extraordinary Design

Oak Flooring – The Process of Restoring Hardwood Floors

3 min read

Unlike some hardwoods, oak continues to be relatively abundant, and most oak floors are solid wood. One advantage of solid boards over engineered ones is that they can be sanded and refinished several times, since there is no need to worry about wearing off the veneer. Defects like curling and warping can also corrected by sanding aggressively. Refinishing is hard work, but it is the only way to restore a damaged floor to “as new” condition.

The traditional methods of floor sanding created a large amount of dust so in preparation it was imperative to cover doors and windows. The technologies have advanced considerably from this and best-served professionals are now equipped to offer dust free floor sanding. Virtually no dust is created throughout the process and it is argued that this process offers a superior finish.

In preparation of commencing the work it is important to clean the floor with a hardwood floor cleaner, because it needs to be free of wax, and fill gaps and cracks before sanding. It is easier to spread the filler over the old finish than over bare wood. An efficient method is to thin latex filler with water until it is pourable and spread it over the entire floor with a grouting float.

Sanding an oak floor primarily involves the use of two heavy machines, a drum sander and an edger, and it requires a certain amount of skill. The drum sander, which is used for the bulk of the floor, wears about 1/16 inch of wood off the wood on each pass. Although the machine is usually run along the flooring, some professionals make diagonal passes with coarse paper to level severely warped floor. The edger, a heavy disk sander, sands many areas that the drum sander cannot reach. A floor scraper and palm sander is then needed for corners and other tight spaces.

Sandpaper with a grit coarser than 60 is not always necessary. It creates deep scratches, so it is wise to limit its use to situations for which it is necessary. These include severely warped or cupped floorboards or a hard finish that does not come off easily. If the floor is level and the finish comes off easily, only two passes with the floor sanders may be needed, one with 80-grit paper and one with 100-grit. A final pass with 120-grit paper leaves the floor exceptionally smooth, but it is optional on oak because small scratches blend with the grain and most finishes fill them.

Most stains are easy to apply to oak. Always work to a doorway so as not to get stuck in a corner. Use either an oil or water based finish on oak applied with a weighted floor finish applicator. By dragging the finish along the grain of the wood with the applicator, streaks, bubbles and brush marks are avoided. Two to three coats of finish are usually required, and each coat should be lightly sanded with a floor buffer and a sanding screen before applying the next. This process results in the complete restoration of the oak floor.

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