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2. Perm (unit) - Wikipedia

   en.wikipedia.org/wiki/Perm_(unit)

   A variant of the metric perm is used in DIN Standard 53122, where permeance is also expressed in grams per square meter per day, but at a fixed, "standard" vapor-pressure difference of 17.918 mmHg. This unit is thus 17.918 times smaller than a metric perm, corresponding to about 0.084683 of a U.S. perm.

3. Vapor barrier - Wikipedia

   en.wikipedia.org/wiki/Vapor_barrier

   Permeability can be reported in perms, a measure of the rate of transfer of water vapor through a material (1.0 US perm = 1.0 grain/square-foot·hour·inch of mercury ≈ 57 SI perm = 57 ng/s·m 2 ·Pa). American building codes started classifying vapor retarders in the 2007 IRC supplement.

4. R-value (insulation) - Wikipedia

   en.wikipedia.org/wiki/R-value_(insulation)

   R-value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the warmer surface and colder surface of a barrier under steady-state conditions. The measure is therefore equally relevant for lowering energy bills for heating in the winter, for cooling in the summer, and for general comfort.

5. How Much Does It Really Cost To Refinish Hardwood Floors ...

   www.aol.com/lifestyle/much-does-really-cost...

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6. Moisture vapor transmission rate - Wikipedia

   en.wikipedia.org/wiki/Moisture_vapor...

   For example, the effect of temperature on the permeability can be as high as 10% per °C, making it possible that MVTR results achieved at 23°C and 37°C can differ by a factor 4. The most common international unit for the MVTR is g/m 2 /day, or " metric perm ".

7. Wood flooring - Wikipedia

   en.wikipedia.org/wiki/Wood_flooring

   Generally, older solid hardwood floors need to be buffed every 3–5 years. The process usually takes about one day. Buffing refers to the process of using a stand up floor buffer. The floor is abraded with 180 grit screen on the buffer. This allows for the new coat of finish to mechanically adhere to the floor.