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Re: Topping required on precast plank?

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Terry Triest wrote:

 Our client is requesting to use a self-leveling material to essentially compensate for the incidental cambering of the plank.  They want to recover most of the 2" which would be lost with the standard 2" topping.Mostly, the plank is supported by bearing walls (5 levels), but the central lobby is at the knuckle of the angled wings and is steel framed.   My concern arise because the supporting HSS beams might need to be flush with the top of plank because of the 10' floor to floor height.  This imposes a crack concern on either side of the beam.Concern # 1 - I feel the self-leveling material is inadequate for crack control at the beams.Concern # 2 - Can we use 1" of ARDEX K-15 with some assurance that cracking can be controlled?Concern # 3 - Has anyone had problems with the topping adhering to the top flange of the beam in this framing condition?  
Terry Triest, EIT
Structural Department
P: 814-940-4041
F: 814-949-2644<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

How about using mesh-reinforced ARDEX K-15? Ardex has an installation method using plaster lath that helps control cracking on flexible substrates.

Davis G. Parsons II, PE RA AEI
a practical architectural engineer
in Fort Worth, Texas