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6/14/23,3:07 PM Chapter 7: Fire and Smoke Protection Features,2021 Washington State Building Code I UpCodes <br /> center along the panel edges.Cavity to be filled with 51/2"mineral wool insulation.Rating established <br /> • from the gypsum-covered side only. <br /> 2"x 6"wood studs at 16"centers with double top plates,single bottom plates;interior side covered with <br /> 5/8"Type X gypsum wallboard,4'wide,applied vertically with all joints over framing or blocking and <br /> fastened with 21/4"Type S drywall screws spaced 7"on center.joints to be covered with tape and joint <br /> 16-1.3q compound.Exterior covered with 3/8"wood structural panels,applied vertically with edges over framing — — — 61/2 <br /> or blocking and fastened with 6d common nails(bright)at 12"on center in the field and 6"on center on <br /> panel edges. R-19 mineral fiber insulation installed in stud cavity. Rating established from the gypsum- <br /> covered side only. <br /> For SI: 1 inch =25.4 mm, 1 square inch=645.2 mm2, 1 cubic foot=0.0283 m3. <br /> a.Staples with equivalent holding power and penetration shall be permitted to be used as alternate fasteners to nails for attachment to wood framing. <br /> b.Thickness shown for brick and clay tile is nominal thicknesses unless plastered, in which case thicknesses are net.Thickness shown for concrete masonry and <br /> clay masonry is equivalent thickness defined in Section 722.3.1 for concrete masonry and Section 722.4.1.1 for clay masonry.Where all cells are solid grouted or <br /> filled with silicone-treated perlite loose-fill insulation;vermiculite loose-fill insulation;or expanded clay,shale or slate lightweight aggregate,the equivalent <br /> thickness shall be the thickness of the block or brick using specified dimensions as defined in Chapter 21. Equivalent thickness shall include the thickness of <br /> applied plaster and lath or gypsum wallboard,where specified. <br /> c. For units in which the net cross-sectional area of cored brick in any plane parallel to the surface containing the cores is not less than 75 percent of the gross <br /> cross-sectional area measured in the same plane. <br /> d.Shall be used for nonbearing purposes only. <br /> e. For all of the construction with gypsum wallboard described in this table,gypsum base for veneer plaster of the same size,thickness and core type shall be <br /> permitted to be substituted for gypsum wallboard, provided that attachment is identical to that specified for the wallboard,and the joints on the face layer are <br /> reinforced and the entire surface is covered with not less than 1/16-inch gypsum veneer plaster. <br /> f.The fire-resistance time period for concrete masonry units meeting the equivalent thicknesses required for a 2-hour fire-resistance rating in Item 3,and having <br /> a thickness of not less than 75/8 inches is 4 hours where cores that are not grouted are filled with silicone-treated perlite loose-fill insulation;vermiculite loose- <br /> fill insulation; or expanded clay, shale or slate lightweight aggregate, sand or slag having a maximum particle size of 3/8 inch. <br /> f/i51 <br /> https://up.codes/viewer-export/washington/wa-building-code-2021/chapter/7/fire-and-smoke-protection-features#721.1 14/28 <br />