7/12 · Just build a one hour wall against the exiting. Not sure if I will describe it correctly, but find a UL or other approved one hour listed design. Just start with half the rated wall against the existing wall, add the studs or built it on the ground and stand it, than add the other layer of sheet rock. Wella a one hour rated wall. C cda Sawhorse 123

UL Assemblies / Wall / UL U314 UL U314 Interior Partitions, Wood Stud (Load-Bearing) Stc 0 Fire Rating 1 Hour System Thickness 4-3/4" PDF (247.73 KB PDF ) REVIT (1.97 MB RVT)

Find resources and details for UL rated wall systems with the required STC and fire ratings for your project. UL Wall Assemblies BIM - Revit Library Transparency Catalog > NAIMA 3E

The Cavity Shaft Wall System includes components that provide the strength to withstand lateral loads and fire protection necessary for walls that enclose elevator shafts, stairwells and other vertical shafts. The system includes gypsum liner panels, gypsum panels and cement board, interior finishing products and framing components. Main Features

Attach 2" (51 mm) wide C-Track to slab at bottom of wall using suitable fasteners at a maximum of 24" (610 mm) o.c. Allow a 3/4" (19 mm) space from wood or steel stud framing on each side of the firewall. 2. Install vertical C-Track at the beginning of the wall and support as needed. 3.

UL U415 System A — Shaft Wall, Steel Stud (Non-Load-Bearing) Products Products > Pipe Insulation. Batts. UL Wall Assemblies BIM - Revit Library Transparency Catalog > NAIMA 3E Plus Fire Rating 1 Hour; System Thickness 4.00000-5/8" PDF

Fire-Rated Wall Assemblies. LP® FlameBlock® Fire-Rated OSB Sheathing is a component of the following 1-Hour Exterior Wall Assembly - UL Design No. U348 

Several options for 1- and 2-hour fire resistance-rated, wood-frame wall assemblies that could be useful for shafts are presented below. 1-Hour Single Wall UL U305 GA WP 3510 UL U311 IBC Table 721.1 (2), Item 14-1.3 UL U332 1-Hour Double Wall UL U341 2-Hour Single wall UL U301 UL U334 IBC Table 721.1 (2) Item Number 14-1.5

A 2-hour fire-resistive, non-load bearing non-combustible partition designed to enclose shaftwalls, containing elevators, ducts, piping, air shafts and similar construction applications. System consists of 1" shaftliner panels supported by 2-1/2", 4" or 6" C-T studs and faced on one side with two layers of 1/2" Type C or 5/8" Type X gypsum board.

were to fail at 1 hour, the wall above could not continue UL U334. FIGURE 5: Shaftliner Wall Assembly with Wood Wall Each Side. FIGURE 6:.

TWO HOUR HORIZONTAL DUCT PROTECTION. WHI 694-0300.1. 09260GG. Scale: 2" = 1'-0". FLEXIBLE SEALANT. Horizontal Shaftwall Duct and Ceiling Assemblies.