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2. Laminated veneer lumber - Wikipedia

   en.wikipedia.org/wiki/Laminated_veneer_lumber

   While plywood became widespread by the early 20th century, the invention of LVL was not until the 1980s after the invention of oriented strand board. [3] The American Wood Council's National Design Specification for Wood Construction is generally updated on a 3- to 5-year cycle. The 1991 release is the first release which mentions LVL.

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4. Self-leveling concrete - Wikipedia

   en.wikipedia.org/wiki/Self-leveling_concrete

   Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]

5. Floor sanding - Wikipedia

   en.wikipedia.org/wiki/Floor_sanding

   A timber floor after carpet has been pulled. The "fluff" is carpet adhesive. A rimu timber floor after the first cut. Preparation is the first stage of the wood floor sanding process. All nails which protrude above the boards are punched down. Nails can severely damage the sanding machines which are being used.

6. Floor slip resistance testing - Wikipedia

   en.wikipedia.org/wiki/Floor_slip_resistance_testing

   The usual safety standard for a level floor is a minimum Pendulum Test Value (PTV) of 36. The pendulum is also the instrument used in the Sustainable Slip Resistance test method, which measures the possible impact of years of use on a potential flooring's slip resistance. The pendulum is also used in the U.S. and elsewhere for determining the ...

7. Janka hardness test - Wikipedia

   en.wikipedia.org/wiki/Janka_hardness_test

   For hardwood flooring, the test usually requires an 80 mm × 150 mm (3 in × 6 in) sample with a thickness of at least 6–8 mm, and the most commonly used test is the ASTM D1037. When testing wood in lumber form, the Janka test is always carried out on wood from the tree trunk (known as the heartwood), and the standard sample (according to ...