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- Janka Hardness Rating
The Janka Hardness Rating applies to both engineered and solid wood flooring and measures the amount of force needed to push a steel ball into the wood to a depth of half the ball's diameter. The higher the Janka Hardness Rating, the more durable and resistant to damage the floor generally is.
- Job Finished
Refers to floors that are installed and then finished rather than being finished at a factory.
- Joint Staggering
The act of installing flooring so that the joints are staggered and do not meet each other side by side.
- Jointed Flooring
Flooring that has no tongue or grove and is usually end-matched, which makes replacing strips easier.
Parallel beams below the subfloor used to support floors and ceilings.