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Re: Cavity Width in Masonry Walls

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Dear William:
Check ACI 530-95 Section 12.9., Max Cavity width should be 4.5"

John Schenne

> From: WILLIAM R. KEEN <wrk(--nospam--at)>
> To: seaint(--nospam--at)
> Subject: Cavity Width in Masonry Walls
> Date: Tuesday, September 29, 1998 5:36 PM
> Does anyone have any experience with large cavities (>3") in masonry
> wall design and construction? UBC permits up to 4 1/2" with the proper
> but NAVFAC P-355 restricts cavity width to 3" unless spot mortar bedding
> used to stiffen the ties. We have a project with CMU backup, 2"
> and clay brick veneer. To get a clean cavity, the architect has specified
> 2" air space for a total cavity of 4". The Navy said no to any more than
a 3" 
> cavity.
> The project is located in Norfolk, Virginia (Zone 1).
> Bill Keen
> Clark Nexsen