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9.36.2. Building Envelope – General

9.36.2. Building Envelope – General . Significant Comments Log Wall Construction Material Values (wood, insulation, brick) Calculation Method: Consistency & Assumptions Framing percentages (59187, 59201) Resolution Add wood species, reference ICC 400 calculation method

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9.36.2. Building Envelope – General

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  1. 9.36.2. Building Envelope – General • Significant Comments • Log Wall Construction • Material Values (wood, insulation, brick) • Calculation Method: Consistency & Assumptions • Framing percentages (59187, 59201) • Resolution • Add wood species, reference ICC 400 calculation method • Correct wood species values, add Insulation RSI values, standard references, LTTR note, correct brick value • Spell out assumptions and use consistent method • Parallel path vs. isothermal planes method • Add examples and illustrations • Add assumptions made for framing percentages

  2. 9.36.2. BE – General – cont’d • Significant Comments • Include requirements for vestibules (59369) • Consistency with Standards (59338) • Require protection of all thermal bridges (59251) • “conditioned” space (Régiedubâtimentdu Québec) • Clarity and Consistency • Resolution • Future task • Differences are small – leave as is • not the intent of the requirement – future task • Use defined term – Editor’s Revisions • Editor’s revisions and suggested clarifications / additions

  3. Calculation methods • Revisions that affect the required minimum RSI values • Change • RSI/mm for SPF • From 0.0087 m²K/W per mm • To 0.0085 m²K/W per mm • Exterior sheathing • from 11 mm OSB (0.1087 m²K/W) • to 12.7 mm Gypsum (0.0775 m²K/W) • Calculation Method • From Parallel Path Method • to Isothermal Method

  4. Calculation methods • Requirement changes due to wood value and sheathing revisions • Ceiling below attics - Parallel7.268.7310.13Cathedral ceilings and flat roofs - Parallel4.635.04Walls - Parallel2.933.163.304.19Floors over unheated spaces - Parallel4.635.04Rim joists - Parallel3.313.563.724.56Foundation walls - Parallel2.053.163.574.17

  5. Calculation methods • Parallel Path Method

  6. Calculation methods • Isothermal Planes Method

  7. Calculation methods • Requirement changes due to Calculation Methods

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