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RE: Pouring Long Walls

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Control joints can be used by both reducing the rebar by 50% (alternate
bars) and by adding a chamfer strip on each side of the wall (this acts as a
"crack inducer" and helps avoid erratic looking joints, typically 3/4" to 1"

Per PCA's "Building Movements and Joints": for vertical construction joints,
"In walls, a horizontal length of placement in excess of 40 ft is not
normally recommended" 

> -----Original Message-----
> From: Jim Kestner [mailto:jkestner(--nospam--at)]
> Sent: Wednesday, March 22, 2000 10:17 AM
> Subject: Pouring Long Walls
> We have always limited the length of our wall pours to 60 feet to
> minimize shrinkage cracking. Is there any way a contractor 
> can pour say
> 120 feet by adding additional joints, say at 30 feet, since they would
> be only partially effective in reducing shrinkage? I do not 
> want to add
> extra longitundinal steel to control shrinkage.
> What would that joint detail look like? Should only 1/2 the bars run
> thru those intermediate joints? Should a metal keyway be used at these
> intermediate joints or some other material?
> Jim Kestner, P.E.
> Green Bay, Wi.