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Shaft Wall Assembly at Non-Rated Floor and 1-Hr Shaft with Concrete Turned Down Beam

Description: 3-ply CLT cannot be in the shaft wall assembly so the turned down concrete beam provides the transition from the shaft wall to the beam.

Purpose: Shaft wall assembly at intermediate floors and glulam beams.

 

Design Notes

  • Concrete turned down beam and glulam beam used to support the shaft wall and maintain rating.
  • CLT floor outboard of the shaft wall assembly.

Acoustics:

  • Shaft wall assembly estimated at STC 39-45 depending on layers of gypsum for shaft rating CLT floor 3-ply (3.5″) with 3/4″ acoustic mat and 3″ concrete = IIC 45 & STC 53.

Fire:

  • Can be used to meet any shaft wall rating requirement based on size of glulam and associated char factor.
Const.
Constructability Moderate
Fire
Fire Rated Up To 2 Hours

Shaft Wall Assembly at Non-Rated Floor and 1-Hr Shaft with Concrete Turned Down Beam

3-ply CLT cannot be in the shaft wall assembly so the turned down concrete beam provides the transition from the shaft wall to the beam.
19-5-SHAFT-WALL-ASSEMBLY-@-3-PLY-CLT---CONC.-CURB---NON-RATED-FLOOR-1HR-SHAFT