Plumbing · P-YY95N

Pipe thru Fire Rated Assembly

Materials

Steel Timber / Wood Metal (misc.)Gypsum / Drywall

Elements

Walls Partitions Anchors / Embeds Roof / Floor Openings

About this detail

A metallic pipe, conduit, or tubing penetrates a one- or two-hour fire-rated gypsum wallboard and stud wall assembly. The wall framing consists of either nominal two-by-four wood studs spaced sixteen inches on center or minimum two-and-one-half-inch steel channel studs spaced maximum twenty-four inches on center. Gypsum board is five-eighths of an inch thick applied per individual Underwriters Laboratories U300 or U400 series designs. The opening is framed on all sides to provide a specific clearance around the penetrating item, accommodating steel pipe, iron pipe, conduit, or copper tubing. Annular space is sealed with a minimum five-eighths-inch thickness of Hilti FS-One sealant applied flush with both wall surfaces, including a one-half-inch diameter bead at the pipe wall interface. Pex piping is strictly prohibited from being used at fire-rated penetrations.

PIPE THRU FIRE RATED ASSEMBLY 12 SECTION A-A 1. Wall Assembly -- The 1 or 2 hr fire-rated gypsum wallboard/stud wall assembly shall be constructed of the materials and in the manner specified in the individual U300 or U400 Series Wall and Partition Designs in the UL Fire Resistance Directory and shall include the following construction features: A. Studs -- Wall framing may consist of either wood studs or steel channel studs. Wood studs to consist of nom 2 by 4 in. lumber spaced 16 in. OC. Steel studs to be min 2-1/2 in. wide and spaced max 24 in. OC. When steel studs are used and the diam of opening exceeds the width of stud cavity, the opening shall be framed on all sides using lengths of steel stud installed between the vertical studs and screw-attached to the steel studs at each end. The framed opening in the wall shall be 4 to 6 in. wider and 4 to 6 in. higher than the diam of the penetrating item such that, when the penetrating item is installed in the opening, a 2 to 3 in. clearance is present between the penetrating item and the framing on all four sides. B. Gypsum Board* -- 5/8 in. thick, 4 ft wide with square or tapered edges. The gypsum board type, thickness, number of layers, fastener type and sheet orientation shall be as specified in the individual U300 or U400 Series Design in the UL Fire Resistance Directory. Max diam of opening is 32-1/4 in. for steel stud walls. Max diam of opening is 14-1/2 in. for wood stud walls. The F Rating of the firestop system is equal to the fire rating of the wall assembly. 2. Through-Penetrants -- One metallic pipe, conduit or tubing to be installed either concentrically or eccentrically within the firestop system. The annular space shall be min 0 in. to max 2-1/4 in. Pipe may be installed with continuous point contact. Pipe, conduit or tubing may be installed at an angle not greater than 45 degrees from perpendicular. Pipe, conduit or tubing to be rigidly supported on both sides of wall assembly. The following types and sizes of metallic pipes, conduits or tubing may be used: A. Steel Pipe -- Nom 30 in diam (or smaller) Schedule 10 (or heavier) steel pipe. B. Iron Pipe -- Nom 30 in. diam (or smaller) cast or ductile iron pipe. C. Conduit -- Nom 4 in diam (or smaller) steel electrical metallic tubing or 6 in. diam steel conduit. D. Copper Tubing -- Nom 6 in. diam (or smaller) Type L (or heavier) copper tubing. E. Copper Pipe -- Nom 6 in. diam (or smaller) regular (or heavier) copper pipe. 3. Fill, Void or Cavity Material* -- Sealant -- Min 5/8 in. thickness of fill material applied within the annulus, flush with both surfaces of wall. At the point or continuous contact locations between pipe and wall, a min 1/2 in. diam bead of fill material shall be applied at the pipe wall interface on both surfaces of wall . HILTI CONSTRUCTION CHEMICALS, DIV OF HILTI INC -- FS-One Sealant *Bearing the UL Classification Mark A 2 1B

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