Building Envelope - Karpinski Engineering

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The scope now extends to new equipment or building systems for industrial or manufacturing processes, when that equipmen
QUICK GUIDE | OHIO’S ASHRAE 90.1-2010 UPDATE | PART 2

ASHRAE 90.1-2010 isn’t just for engineers. Its requirements impact architectural design, too. Below are highlights of what’s new for purpose, scope, and the building envelope:

PURPOSE (CHAPTER 1) …… This brief section elaborates on the purpose of 90.1: It’s not only for design, but also construction; operations and maintenance plans; and the use of “on-site, renewable energy resources.”

SCOPE (CHAPTER 2) …… The scope now extends to new equipment or building systems for industrial or manufacturing processes, when that equipment or system(s) is specifically referenced by the Standard.

BUILDING ENVELOPE (CHAPTER 5) Mandatory Provisions (5.4) …… Continuous Air Barrier (5.4.3.1) New section. This section requires the entire building envelope to have a continuous air barrier. It includes specifics for air barrier design and installation, as well as for the information now required on construction documents. …… Fenestration and Doors (5.4.3.2) Air leakage performance requirements are now more specific (e.g., calling out additional door categories) and more stringent. …… Vestibules (5.4.3.4) For climate zone 4. Buildings greater than 1,000 SF are now required to have vestibules (previously, the requirement applied to buildings greater than 10,000 SF). Prescriptive Building Envelope Option (5.5) …… Building Envelope Requirements for Climate Zones (Tables 5.5-1–8) The updated tables reflect significant changes in standards for metal building performance in all climate zones. …… Roof Solar Reflectance and Thermal Emittance (5.5.3.1.1) For climate zones 1–3. This section, previously called “High Albedo Roofs,” has been updated. Changes include increased performance requirements for solar reflectance value and solar reflectance index. …… Minimum Skylight Fenestration Area (5.5.4.2.3) New section. For climate zones 1–5. This section adds requirements for skylights in enclosed spaces, specifying both the size of the space and the type of the space (ranging from offices to manufacturing). The skylight area needs to be controlled per Chapter 9. There are a number of exceptions. …… Solar Heat Gain Coefficient (SHGC) of Vertical Fenestration (5.5.4.4.1) The section provides a new exception pertaining to the SHGC for dynamic glazing. …… Solar Heat Gain Coefficient (SHGC) of Skylights (5.5.4.4.2) The section provides new exceptions to the SHGC requirements. …… Fenestration Orientation (5.5.4.5) New section. The Standard now gives requirements for the area of vertical fenestration on the south-facing side of the building (for the northern hemisphere; reversed for the southern hemisphere) in relation to the area of vertical fenestration on the west side and the east side of the building. Submittals (5.7) …… Visible Transmittance (5.7.3) New section. The manufacturer’s visible transmittance test results for skylight glazing or diffusers need to be included with the construction documents. Product Information and Installation Requirements (5.8) …… Joints in Rigid Insulation (5.8.1.10) New section. Staggering multiple (two or more) layers of rigid insulation, which helps prevent thermal bridging and infiltration, is now required.

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