7/13/2023 0 Comments 2013 ashrae 90.1![]() ![]() Corrections in default u-factor roofĪcknowledges dramatic performance reduction from all of ASHRAE's previously published U-factors of traditional compressed laminated insulation in roof and walls. Previously industry has published performance values of 20% to 40% greater than the typical installed performance which are technically unsupported. Pre-engineered metal buildings represent at least 50% of the low rise non-residential US market and the changes to insulating metal buildings will make a huge impact. Modifications to Roof and Wall Assembly Descriptions.Corrections in Default U-factor Roof and Wall Tables. ![]() Newly Published ASHRAE Standard 90.1-2013ĪSHRAE publishes new 2013 energy standard incorporating major revisions:
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