Hip roof rafter span table3/16/2024 This reduction shall not apply to the insulation and fenestration criteria in Section N1102.1.2 and the Total UA alternative in Section N1102.1.5. Where Section N1102.1.2 requires R-60 insulation in the ceiling or attic, installing R-49 over 100 percent of the ceiling or attic area requiring insulation shall satisfy the requirement for R-60 insulation wherever the full height of uncompressed R-49 insulation extends over the wall top plate at the eaves. Code - N1102.2.1 (R402.2.1) Ceilings With Attics Where Section N1102.1.3 requires R-49 insulation in the ceiling or attic, installing R-38 insulation over 100 percent of the ceiling or attic area requiring insulation shall satisfy the requirement for R-49 insulation wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves. It does not say anything about it being ok to "squish" the insulation at the eaves.įor those interested, posting the section wwhitney is referring to.Ģ022 CT Res. Where I disagree with you is in that the requirement is R-49 over 100% including at wall top plates. But in that case, the insulation can typically overflow the cavity (extend above the ceiling joists). The section you are referring to would apply to stick-frame construction with an attic. Given that Steveray was discussing insulation not fitting within the rafter cavity, I figured he was speaking directly to either no-attic or conditioned attic spaces. SPAN TABLES Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. The noted section does not entirely resolve the issue, particularly given the sentence I put in green text, but the 500sf/20% would definitely help This reduction shall not apply to the Total UA alternative in Section N1102.1.5. This reduction of insulation from the requirements of Section N1102.1.3 shall be limited to 500 square feet (46 m2) or 20 percent of the total insulated ceiling area, whichever is less. Insulation shall extend over the top of the wall plate to the outer edge of such plate and shall not be compressed. Code - N1102.2.2 (R402.2.2) Ceilings Without Attics Where Section N1102.1.3 requires insulation R-values greater than R-30 in the interstitial space above a ceiling and below the structural roof deck, and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation R-value for such roof/ceiling assemblies shall be R-30. In our example, you’d need to purchase 5 sheets.I see that Table N1102.1.3 requires R-60 given all of CT is Climate Zone 5A, but.Ģ022 CT Res.
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