"Click" or Woodloc systems: there are a number of patented "click" systems that now exist. These click systems are either "unilin" or "fiboloc" A "click" floor is similar to tongue-and-groove, but instead of fitting directly into the groove, the board must be angled or "tapped" in to make the curved or barbed tongue fit into the modified groove. No adhesive is used when installing a "click" floor, making board replacement easier. This system not only exists for engineered wood floors but also engineered bamboo and a small number of solid floors (such as "parador solido click") and is designed to be used for floating installations. It is beneficial for the Do-It-Yourself market.
 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)

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. Hardwood Floors

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