Page 16 - CPVC Fire Sprinkler Products Installation Instructions & Technical Handbook
P. 16

Unfinished Basements - Exposed Installations
Solid and Composite Wood Joists (UL and C-UL)
TYCO CPVC Pipe and Fittings may be installed without protection (exposed) in unfinished basements in accordance with NFPA 13D when subject to the following additional limitations:
• The ceiling shall be horizontal and constructed utilizing solid wood joists or composite wood joists with a nominal depth of 16 in. (406,4 mm) or less on maximum 24 in. (609,6 mm) centers.
• The distance from the floor to the bottom of the joists shall be between 7 ft and 10 ft (2,1 m and 3,0 m).
• Listed residential pendent sprinklers with a maximum temperature rating of 155°F (68°C) and a minimum K-factor of 4.9 are to be used for this type of installation. The maximum sprinkler spacing shall not exceed 16 ft (4,9 m). Lesser areas are also permitted. The system is to be designed based upon the Listed flows for the sprinkler selected except that the flow for a single sprinkler or for multiple sprinklers flowing is to be not less than 13 gpm (49,2 lpm) per sprinkler. The sprinklers are to be installed with their deflectors a maximum of 1 3/4 in. below the bottom of the solid wood or composite wood joists in anticipation of future installation of a finished ceiling. (Refer to NFPA 13D, Section 8.2.4, 2016 Edition.)
• Schedule 80 fittings in the 1 1/2 in. and larger sizes shall be used.
• All solvent cement joints shall be made with One Step Solvent Cement (TFP-500 or TFP-600).
• The maximum length along the joist shall not exceed 40 ft (12,2 m). When the length exceeds 40 ft (12,2 m), blocking shall be utilized. The blocking shall be constructed of minimum 1/2 in. (12,7 mm) plywood, minimum 3/8 in. (9,5 mm) gypsum wallboard or batt insulation with a minimum thickness of 3 1/2 in. (89 mm). These blocking materials shall be the full depth of the joists. When batt insulation is used as blocking, it must be a single piece of insulation. The insulation must be secured in place with metal wire netting which must encase the insulation on both of the exposed sides. The metal wire netting is required to hold the insulation in place and prevent it from being dislodged or repositioned over time. It is acceptable for items such as piping, wires, ducts, etc. to penetrate the blocking. The gap between the item penetrating the blocking and the blocking should be minimized. For installations where the gap exceeds 1/4 in. (6,4 mm), the gap shall be filled with insulation, caulking, or other suitable material.
• When installing TYCO BlazeMaster® CPVC pipe and fittings perpendicular to the joists:
- System mains installed below the joists shall use listed support devices for thermoplastic sprinkler piping or other listed support devices which mount the piping directly to the bottom of the joists.
- System mains and branch lines installed through the joists using holes, for support, shall be at or below the center of the depth of the joist. The holes should be oversized to allow for movement and located to not impair the structural integrity of the joists.

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