To fix a buckled floorboard, you need to be able to access the floor from below. The way to tackle this problem is to put weight on the buckled area from above — a cement block works well. Then install a 1 1/4-inch screw in the buckled flooring from below. Allow the screw to penetrate only halfway into the flooring, or it may come up through the finished surface. Driving the screw through the subfloor and into the flooring pulls the flooring down against the subfloor and gets rid of the buckled spot. Denver Hardwood Floor Install
Most floors use a tongue-and-groove design for connecting adjacent strips. This design makes replacing a single strip or plank challenging, but not impossible. First, look for any nails in the damaged board and drive them as far through the board as possible by using a hammer and nail set. Carpenters use nail sets to drive nails flush with trim without damaging the trim with a hammer. After you’ve cleared the nails, it’s time to remove the damaged board and install a new one. Follow these steps:
Eliminate any problem spots to make the subfloor level. Sand minor humps down with a hand-held or orbital sander to make the subfloor level. To fill any dips or low spots, use a leveling compound (also known as floor patch). Mix up the compound according to package directions, fill in the dips, then pull your straight piece of lumber back and forth over the spot to flatten and level it with the rest of the subfloor.[7] Hardwood Floors
The age of your floor also plays a role. If your floor has been in place for decades, it may resist refinishing for a number of reasons. For instance, if it has already been refinished several times or if too much of the surface wood has become exposed, refinishing your floor may have little effect. For very old floors, replacement can often be preferable to refinishing. Denver Hardwood Flooring

 116% harder than Red Oak (1)  12% harder than Red Oak (11)  123% Harder than Red Oak (4)  125% harder than Red Oak (2)  141% harder than Red Oak (2)  15% softer than Red Oak (2)  165% harder than Red Oak (2)  174% harder than Red Oak (5)  18% softer than Red Oak (1)  185% harder than Red Oak (4)  198 % harder than Red Oak (2)  2% harder than Red Oak (2)  2% Softer than Red Oak (1)  25% softer than Red Oak (1)  28% harder than Red Oak (1)  30% harder than Red Oak (8)  33% harder than Red Oak (2)  41% harder than Red Oak (7)  43% harder than Red Oak (1)  5% harder than Red Oak (8)  53% softer than Red Oak (1)  6% harder than Red Oak (14)  67% harder than Red Oak (5)  74% harder than Red Oak (2)  81% harder than Red Oak (2)  82% harder than Red Oak (2)  9% softer than Red Oak (1)  about the same as Red Oak (7)  Benchmark at 1290 on Janka Scale (37) Hardwood Floors
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