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F <br /> STAIRWELL STRINGER <br /> 101 Y" Section R302.11 Fireblocking Designer: <br /> - _ <br /> lo <br /> lo <br /> SLOPED HANGER R302.11 Fireblocking: Q <br /> STAIRWELL WALLS ARE TO In combustible construction, fireblocking shall be provided to cut off all concealed draft openings (both �+ LU <br /> BE FIREBLOCKED PER IRC2012 co <br /> vertical and horizontal) and to form an effective fire barrier between stories, and between a top U a w U <br /> Fq story and the roof space. t a Q a <br /> SECTION R302.11. Fireblocking shall be provided in wood-frame construction in the following locations: o _S__3 <br /> 1. In concealed spaces of stud walls and partitions, including furred spaces and parallel rows of studs _ _m <br /> Zor staggered studs, as follows: a o <br /> 1.1. Vertically at the ceiling and floor levels. s rn o <br /> —DBL. 2x8 HEADER FACE MOUNT 1.2. Horizontally at intervals not exceeding 10 feet (3048mm). <br /> _ SLOPED HANGER 2. At all interconnections between concealed vertical and horizontal spaces such as occur at soffits, <br /> @ EA. STRINGER F�i,9 drop ceilings and cove ceilings. t <br /> FINISHED FLOOR 3. In concealed spaces between stair stringers at the top and bottom of the run. Enclosed spaces <br /> EXIST. FLOOR FRAMING' l under stairs shall comply with Section R302.7. <br /> 4. At openings around vents, pipes, ducts, cables and wires at ceiling and floor level, with an <br /> approved material to resist the free passage of flame and products of combustion. The material Jurisdiction: <br /> filling this annular space shall not be required to meet the ASTM E 136 requirements. <br /> 1-1/2"0 HANDRAIL 5. For the fireblocking of chimneys and fireplaces, see Section R1003.19. <br /> 6. Fireblocking of cornices of a two-family dwelling is required at the line of dwelling unit separation. <br /> R302.11.1 Fireblocking materials: (X <br /> Except as provided in Section R302.11, Item 4, fireblocking shall consist of the following materials: 3200 cedar Street <br /> Everett, WA. 98201 <br /> TREAD SUPPORTS HANDRAIL -� 1. Two=inch (51mm) nominal lumber. 14251 257-8810 <br /> BRACKET 2. Two thicknesses of 1-inch (25.4mm) nominal lumber with broken lap joints. <br /> Ixl2 FINISH TREADS 3. One thickness of 23/32-inch (18.3mm) wood structural panels with joints backed by 23/32-inch Project: <br /> 2.X12 (18.3mm) wood structural panels. <br /> TPL. W 4. One thickness of 3/4-inch (19.1mm) particleboard with joints backed by 3/4-inch (19.1mm) U <br /> STRINGERS particleboard. N <br /> 5. One-half-inch (12.7mm) gypsum board. <br /> 1/2" RISERS w/ 6. One-quarter-inch (6.4mm) cement=based millboard. > <br /> ATTACHED FINISHES _ ` 7. Batts or blankets of mineral wool or glass fiber or other approved materials installed in such a ! <br /> manner as to be securely retained in place. <br /> 8. Cellulose insulation installed as tested for the specific application. Dc <br /> r FINISHED FLOOR <br /> R302.11.1.1 Batts or blankets of mineral or glass fiber: > E <br /> Batts or blankets of mineral or glass fiber or other approved nonrigid materials shall be permitted for Q) m <br /> Stair Sections compliance with the 10-foot (3048mm) horizontal fireblocking in walls constructed using parallel rows U <br /> Scale: 1/2"=1'-0" • of studs or staggered studs. <br /> R302.11.1.2 Unfaced fiberglass: 3 <br /> Unfaced fiberglass batt insulation used as fireblocking shall fill the entire cross section of the wall cavity w a <br /> 00 <br /> to a minimum height of 16-inches (406mm) measured vertically. When piping, conduit or similar Q.) <br /> BASEMENT FLOORr �l o o o obstructions are encountered, the insulation shall be packed tightly around the obstruction. o <br /> I I <br /> I I <br /> 5 2 R302.11.1.3 Loose-fill insulation material: w <br /> I I <br /> Loose-fill insulation material shall not be used as a fireblock unless specifically tested in the form and .� <br /> manner intended for use to demonstrate its ability to remain in place and to retard the spread of <br /> I ° fire and hot gases. <br /> I-1/2"0 HANDRAIL ° ° D R302.11.2 Fireblocking integrity: <br /> The integrity of all fireblocks shall be maintained. <br /> Vj P.T. 2x12 NAILER "Inner Stair <br /> Section <br /> CE 3/8" EXPANSION ANCHORSand <br /> n MIN. EMBED = 3" DEPTH Details <br /> o <br /> 4 ® Drawn: <br /> 3x OR DBL. 2x D. Almond <br /> ® ZZSTUD AT BRACKET _ Date: <br /> ! <br /> 03/01/2016 <br /> m <br /> HANDRAIL BRACKET(5) MUST BE <br /> b6 SECURELY FASTENED INTO WALL Plan: <br /> FRAMING BEYOND (TYP). <br /> A <br /> Handrail Sections - TOP of NOSINGOi 8/ <br /> , <br /> Not to Scale <br />