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Create Rule5-42.md #1537
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# Envelope - Rule 5-42 | ||
**Schema Version:** 0.0.37 | ||
**Mandatory Rule:** False | ||
**Rule ID:** 5-42 | ||
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**Rule Description:** Each linear thermal bridge and point thermal bridge as identified in Section 5.5.5 shall be modeled using either of the following techniques: | ||
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a. A separate model of the assembly within the energy simulation model. | ||
b. Adjustment of the clear-field U-factor in accordance with Section A10.2. | ||
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**Rule Assertion:** B-RMR = expected value | ||
**Appendix G Section:** Table G3.1 Section 5(a)-1 Proposed | ||
**Appendix G Section Reference:** 5(a) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Same as above |
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**Data Lookup:** None | ||
**Evaluation Context:** Evaluate each Project | ||
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**Applicability Checks:** | ||
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1. A project has an exterior wall | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Thermal bridging technically applies to all types of constructions including exterior walls, below grade walls, roofs, floors. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. yes, so this could say building has an exterior wall or an exteriors roof or a below grade wall or a floor. Not sure if there would ever be a scenario where a building doesn't have even one of these. |
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**Function Call:** | ||
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**Manual Check:** Ensure that linear and point thermal bridges, as identified in Section 5.5.5 are modeled using either of the following techniques: | ||
a. A separate model of the assembly within the energy simulation model. | ||
b. Adjustment of the clear-field U-factor in accordance with Section A10.2. | ||
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**Rule Logic:** | ||
**Applicability:** | ||
- look at each zone in the RMD: `for zone in P_RMD....zones:` | ||
- look at each surface in the zone: `for surface in zone.surfaces:` | ||
- if the surface is an exterior surface, then this rule is applicable for the entire project: `if((surface.adjacent_to == "EXTERIOR") or (surface.adjacent_to == "GROUND")): UNDETERMINED` | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This looks good because you are actually checking for any exterior surface even though the language above says that it only applies to exterior walls. |
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- if the rule logic gets here without an UNDETERMINED outcome, then the project is not applicable: `NOT_APPLICABLE` | ||
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**[Back](../_toc.md)** |
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#1 is technically an exception so recommend Table G3.1 Section 5a Exception #1