Required R Value In Roof Ashrae 90 1

Calculation method nacm reference manual.

Required r value in roof ashrae 90 1. American society of heating refrigerating and air conditioning engineers ashrae 90 1. Specific insulation requirements of section c402 2 thermal requirements of either. C402 1 3 insulation component r value based method c402 1 4 assembly u factor c factor or f factor based method. Ashrae 90 1 also provides prescriptive insulation values for semi heated buildings that are shown in these tables.

R value is for continuous insulation metal building wall r value insulation compressed between metal wall panels and the steel structure steel framed wall r value uncompressed insulation installed in the cavity between steel studs wood framed and other r value uncompressed insulation installed in the. 5 1 3 clarifies roof insulation requirements differentiating between roof recovering on top of existing roof covering. The r eference manual has been built off work originally done by comnet for the standard 90 1 2016 commercial building energy modeling guidelines and procedures and by cec for the nacm reference manual. State only ma massachusetts 780 cmr chapter 13 5 r 30 state only mi michigan ashrae 90 1 2007 5 r 20 6 r 20 7 r 20 state only mn minnesota minnesota commercial state building code 6 r 30 7 r 35 please see disclaimer on back page.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. The values in these tables apply to buildings that are heated and or cooled as defined in 90 1.