Codes & Standards

ASHRAE 90.1 – 2007 (90.1 ASHRAE 2004)
Climate ZoneRoof (Conditioned)Roof (Semi-Heated)Walls (Conditioned)Walls (Semi-Heated)
PerformancePrescriptivePerformancePrescriptivePerformancePrescriptivePerformancePrescriptive
10.065aR-191.280NR0.113R-131.180NR
20.065aR-190.167R-60.113R-130.184R-6
30.065aR-190.097R-100.113R-130.184R-6
40.065R-190.097R-100.113R-130.134R-10
50.065R-190.097R-100.113R-130.123R-11
60.065R-190.097R-100.113R-130.113R-13
70.065R-190.097R-100.057R-13 + R-130.113R-13
80.049R-13 + R-190.072R-160.057R-13 + R-130.113R-13
Climate Zones 1-8 are standing seam roofs with a 1″ thick thermal spacer block. NR=No Requirement
a. For Metal Building roof panels installed directly above conditioned paces that are not cooled, where the exterior surface has a Solar Reflectance of 0.70 and a minimum Thermal Emittance of 0.75 or a Solar Reflectance Index of 82, the roof insulation shall comply with a maximum U-Factor of 0.084 for Climate Zone 1, U-Factor of 0.078 for Climate Zone 2, and a U-Factor of 0.076 for Climate Zone 3
ASHRAE 90.1 – 2010 (90.1 – 2007 addendum g)
Climate ZoneRoof (Conditioned)Roof (Semi-Heated)Walls (Conditioned)Walls (Semi-Heated)
PerformancePrescriptivePerformancePrescriptivePerformancePrescriptivePerformancePrescriptive
10.065aR-190.167R-60.093R-160.113R-13
20.055aR-13 + R-130.097R-100.093R-160.113R-13
30.055aR-13 + R-130.097R-100.084R-190.113R-13
40.055R-13 + R-130.097R-100.084R-190.113R-13
50.055R-13 + R-130.083R-130.069R-13 + R-5.6 ci0.113R-13
60.049R-13 + R-190.072R-160.069R-13 + R-5.6 ci0.113R-13
70.049R-13 + R-190.072R-160.057R-13 + R-5.6 ci0.113R-13
80.035R-11 + R-19 LS0.065R-190.057R-13 + R-5.6 ci0.113R-13
Climate Zones 1-8 are standing seam roofs with a minimum R-3.5 thermal spacer block. L=Liner System, ci=Continuous Insulation
a. Metal Building roof panels installed directly above cooled conditioned spaces in Climate Zone 1, shall comply with a minimum 3-year aged Solar Reflectance of 0.55 and a minimum 3-year aged Thermal Emittance of 0.75 or a
minimum 3-year aged Solar Reflectance Index of 64, if not, the roof insulation must be increased by installing a system with a maximum U-Factor of 0.028.
ASHRAE 90.1 – 2013, 2016, 2019 & 2022
Climate ZoneRoof (Conditioned)Roof (Semi-Heated)Walls (Conditioned)Walls (Semi-Heated)
PerformancePrescriptivePerformancePrescriptivePerformancePrescriptivePerformancePrescriptive
0 & 1*0.041aR-10 + R-19 FC0.115R-100.094R-0 + R-9.8 ci0.352NR
20.041aR-10 + R-19 FC0.096R-160.094R-0 + R-9.8 ci0.162R-13
30.041aR-10 + R-19 FC0.096R-160.094R-0 + R-9.8 ci0.162R-13
40.037R-19 + R-11 LS or
R-25 + R-8 LS		0.082R-190.060R-0 + R-15.8 ci0.162R-13
50.037R-19 + R-11 LS or
R-25 + R-8 LS		0.082R-190.050R-0 + R-19.0 ci0.094R-0 + R-9.8 ci
60.031R–25 + R-11 LS0.060R-19 + R-190.050R-0 + R-19.0 ci0.094R-0 + R-9.8 ci
70.029R- 30 + R-11 LS0.037R-19 + R-11 LS or
R-25 + R-8 LS		0.044R-0 + R-22.1 ci0.072R-0 + R-13 ci
80.026R-25 + R-11 +
R-11 LS		0.037R-19 + R-11 LS or
R-25 + R-8 LS		0.039R-0 + R-25 ci0.060R-0 + R-15.8 ci
Climate Zone 1-8 are standing seam roofs with minimum R-3 thermal spacer block, except for the Filled Cavity (FC) systems which require a minimum R-5 thermal spacer block;
LS = Liner System, ci = Continuous Insulation
a. Metal Building roof panels installed directly above cooled conditioned spaces, shall comply with a minimum 3-year aged Solar Reflectance of 0.55 and a minimum 3-year aged Thermal Emittance of 0.75 or a minimum 3-year aged
Solar Reflectance Index value of 64, if not, the roof insulation must be increased by installing a system with a maximum U-Factor of 0.028.
*Climate Zone 0 was added in 2019.

IECC – 2009
Climate ZoneRoofWalls
PerformancePrescriptivePerformancePrescriptive
10.065R-190.093R-16
20.055R-13 + R-130.093R-16
30.055R-13 + R-130.084R-19
40.055R-13 + R-13 0.084R-19
50.055R-13 + R-13 0.069R-13 + R-5.6 ci
60.049R-13 + R-190.069R-13 + R-5.6 ci
70.049R-13 + R-190.057R-19 + R-5.6 ci
80.035R-11 + R-190.057R-19 + R-5.6 ci
LS = Liner System, ci = Continuous Insulation
Roof assemblies are based on a standing seam roof with an R-5 thermal spacer block.
IECC – 2012, 2015 & 2018
Climate ZoneRoof1 Walls
PerformancePrescriptivePerformancePrescriptive
10.035R-19 + R-11 LS0.079R-13 + R-6.5 ci
20.035R-19 + R-11 LS0.079R-13 + R-6.5 ci
30.035R-19 + R-11 LS0.079R-13 + R-6.5 ci
40.035R-19 + R-11 LS0.052R-13 + R-13 ci
50.035R-19 + R-11 LS0.052R-13 + R-13 ci
60.031R-25 + R-11 LS0.052R-13 + R-13 ci
70.029R-30 + R-11 LS0.052R-13 + R-13 ci
80.029R-30 + R-11 LS0.052R-13 + R-13 ci
LS = Liner System, ci = Continuous Insulation
All information in this chart is based on the International Energy Conservation Code, Chapter 4.  For specifics regarding years 2012, 2015 & 2018, please refer to Section C402 Building Envelope Requirements of the IECC.
1. Where using R-value compliance method, a thermal spacer block shall be provided.  Please refer to IECC Section C402 for specific thermal block R-value requirements.”
IECC – 2021 & 2024
Climate ZoneRoof1 Walls
PerformancePrescriptivePerformancePrescriptive
00.035a,bR-19 + R-11 LS0.079R-13 + R-6.5 ci
10.035bR-19 + R-11 LS0.079R-13 + R-6.5 ci
20.035bR-19 + R-11 LS0.079R-13 + R-6.5 ci
30.035R-19 + R-11 LS0.079R-13 + R-6.5 ci
40.035R-19 + R-11 LS0.052R-13 + R-13 ci
50.035R-19 + R-11 LS0.050R-13 + R-14 ci
60.031R-25 + R-11 LS0.050R-13 + R-14 ci
70.029R-30 + R-11 LS0.044R-13 + R-17 ci
80.026R-25 + R-11 + R-11 LS0.039R-13 + R-19.5 ci
LS = Liner System, ci = Continuous Insulation
All information in this chart is based on the International Energy Conservation Code, Chapter 4. For specifics regarding years 2021 & 2024, please refer to Section C402 Building Envelope Requirements of the IECC.
1. Where using R-value compliance method, a thermal spacer block shall be provided. Please refer to IECC Section C402 for specific thermal block R-value requirements.
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