Translating U factor from French system to US system Résolu

Hi, Gustav.


From wikipedia >>

"The conversion between SI and US units of R-value is 1 h·ft2·°F/Btu = 0.176110 K·m2/W, or 1 K·m2/W = 5.678263 h·ft2·°F/Btu.[9]
More simply, R-values may be converted from SI to US units through the following, where RSI is the given unit in metric units:
R-value (US) = RSI × 5.678263337Or converted from US units to SI units, where R-value is given in imperial units:
RSI (SI) = R-value × 0.1761101838"
Note that this is for the thermal resistance R, which is the inverse of the thermal conductance U.
For example, a window with a thermal conductance SI of 1. 4 W / m2.K will have a thermal resistance of 1 / 1.4 = 0.71 K.m2 /W, that is in US units >>
R-value US = 0.71 x 5.67 = 4 h.ft2 ° F/BTU
And U-value US= 1/4 = 0.25 .BTU/(h °F ft2)
More simply, U-value (US) = U (SI) /5.67

Gustav a écrit:

I am doing major renovation on my house in Boston, MA, USA
I plan to use casement window with unobstructed view (no divider in the middle of window) similar to the wood windows sold at Lapeyre.
I Need to Know how to translate insulation factor U from English scale / measure to the American U measure.
aussi Will I need a certificate from the manufacturer showing the translation. This is for the Inspectors to accept que la windows / doors meet local Boston règlements. Thank you in advance for ahlp

you arrive on the forum by writing in English ( with some French words in the text ), we are not all perfectly bilingual to indicate all the technical terms, even if we are quite expert,

just ask the manufacturer if there is an official document for the convertion US / FR... the US legislation may not be the same as in France either ...no?

P'tain,

Forum construire devient international !!!

ET je rajouterais >>

Fuck the US units !!!

Thank you for the technical details. it is very helpful. I intend to ask the manufacturer for such a letter but wanted to get educated on it first.