NFP - Interior and Exterior Material/Construction Radiant Properties - #11665
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This is the first draft of an NFP to resolve this issue.
Changes to this NFP were made in response to the results of the technicalities call on June 24, 2026.
| 1.9.3.1.9 Field: Visible Absorptance Exterior Face | ||
| The visible absorptance field in the Material input syntax represents the fraction of incident visible wavelength radiation that is absorbed by the material. This particular field is for the exterior side or face only. Visible wavelength radiation (0.37 to 0.78 μm weighted by photopic response) is slightly different than solar radiation in that the visible band of wavelengths is much more narrow while solar radiation includes the visible spectrum as well as infrared and ultraviolet wavelengths. This parameter is used when calculating the amount of incident visible radiation absorbed by various surfaces and affects the outside surface heat balances as well as the daylighting calculations. If visible reflectance (or reflectivity) data is available, then absorptance is equal to 1.0 minus reflectance (for opaque materials). Values for this field must be between 0.0 and 1.0. The default value for this field is 0.7. | ||
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| 1.9.3.1.10 Field: Thermal Absorptance Interior Face |
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Maybe use "Inside Face" (and "Outside Face")? At least for surfaces, it looks like there is somewhat of a precedence for that.
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@joseph-robertson Yes, you are correct. There is a precedent for using inside and outside face. That is what I should have used instead of interior/exterior. I will correct this in the NFP and push it up when I make other modifications based on yesterday's technicalities call. Thanks!
Updates to the NFP based on discussion during the 7/8/26 technicalities call.
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Final call for comments on this NFP. This has already undergone two rounds of discussions on technicalities calls and subsequent revisions, so I think we're likely close. If anyone has final comments, please make them known ASAP. |
mitchute
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Pull request overview
Constructionto better model roofs/radiant barriers/etc. #11393Description of the purpose of this PR
Publication of the NFP
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