Unvented Attic Hatch Guide

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JM Corbond® oc SPF UNVENTED ATTIC GUIDE Always follow local building codes. For application without a Prescriptive Ignition Barrier or Coating in Unvented Attics, JM Corbond oc SPF CCRR-1079 Requires: Attic Requirements Complying with IBC Section 2603.4.1.6, and IRC Sections R316.5.3 and R316.5.4 a) Entry to the attic is only for the service of utilities and no storage is permitted. b) There are no interconnected attic space areas. c) Air in the attic is not circulated to other parts of the building. d) Air-impermeable insulation is permitted in accordance with 2015 IBC Section 1203.3 or IRC Section R806.5 (2009 R806.4). e) Combustion air is provided in accordance with IMC Section 701. Attic Access Requirements Complying with IRC Section R807 a) Attic areas that exceed 30 ft2 and have a vertical height of 30 in (when measured from the top of the ceiling framing member to the underside of the roof framing member) or greater must have attic access. b) The attic hatch must be horizontally placed in the floor and opening outward toward the living space. c) The attic hatch must have a minimum rough-framed opening of 22 in x 30 in. d) The attic hatch must be located in a hallway or other readily accessible location. e) The attic hatch must not be locked. f) The attic hatch must be easy enough to open that a person can pull it down without difficulty. Insulation Requirements a) When applied to the attic floor, the insulation may be installed to a maximum thickness of 16 in. b) When applied to the underside of roof sheathing and/or rafter, and to vertical wall surfaces, the insulation may be installed to a minimum thickness of 3-3/4 in and a maximum thickness of 16 in. c) Rafters may be left uncovered, or the insulation may be installed up to maximum 16 in. Unvented Attic Assembly with JM Corbond oc SPF BID_295 2/17 © 2017 Johns Manville. All Rights Reserved..

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Weights and Measures
Schedule of Values Yadkin County 2009 Architectural Terms Apartment hotel a building designed for non-transient residential use, divided into dwelling units similar to an apartment house, but having such hotel apartment hotel accommodations as room furnishings, lounges, public dining room, maid service, etc. Apartment house a multi-family residence containing three or more non-transient residential living units and generally providing them with a number of common facilities and services. Attic An unfinished or semi-finished portion of a building lying between the highest finished story and the roof and wholly within the roof framing. Basement a building story which is wholly or partly below the grade level. Bay (1) a horizontal area division of a building usually defined as the space between columns or division walls. (2) an internal recess formed by causing a wall to project beyond its general line. Bay window a window, or group of continuous windows, projecting from the main wall of a building. Beam a long structural load-bearing member which is placed horizontally or nearly so and which is supported at both ends or, infrequently, at intervals along its length. Beam, spandrel a wall beam supporting the wall, above, as well as the floor. Building any structure partially or wholly above ground which is designed to afford shelter to persons, animals, or goods. See also construction. Building, fireproof a building in which all parts carrying loads or resisting stresses and all exterior and interior walls, floors, and staircases are made of incombustible materials, and in which all metallic structural members are encased in materials which remain rigid at the highest probable temperature in case its contents are burned, or which provide ample insulation from such a temperature.
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Technology Fact Sheet ATTIC ACCESS ATTIC ACCESS For more information, contact: ATTIC KNEE WALL Energy Efficiency and Knee wall Provide adequate insulation coverage and air sealing for the Renewable Energy Desired Clearinghouse (EREC) ventilation access between living space and the unconditioned attic 1-800-DOE-3732 Attic Seal living Seal www.eren.doe.gov outlet space box to Attic space DON’T LEAVE A HOLE IN THE CEILING drywall Hardboard Or visit the BTS Web site at A home’s attic access, such as an attic hatch, SCUTTLE HOLE COVER www.eren.doe.gov/buildings Seal all edges of rigid Seal pull-down stairs, or knee-wall door, often goes Insulation dams foam insulation prevent loose-fill Or refer to the Builder’s Guide uninsulated, representing one of the biggest Unwanted air leakage Attic ventilation insulation from Energy Efficient Building deficiencies in the thermal barrier between the falling through Hatch lid pushes up and Association, Inc. access out of the way for access Buildings for attic and conditioned space. This gap in the 651-268-7585 The attic knee wall is often underinsulated and leaky. Install adequate insulation and air seal around the 21st Century attic insulation increases heat loss in winter www.eeba.org the living space for continuity in the building envelope when addressing the knee-wall door. Buildings that are more and heat gain in summer, and makes indoor Written and prepared for living areas uncomfortable. the U.S. Department of energy-efficient, comfortable, Energy by: KNEE WALLS and affordable…that’s the Such accesses are often not sealed properly.
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Chapter 12 Interior Environment
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