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RE: Nonshrink Grout Thickness

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A reasonable maximum thickness would be about 2 or 3 inches. But it depends a lot on the aspect ratio of the shim stack, grout type, and grout placement. Go to for some good guidance.

Commonly shims are sent that are about 2" x 2". I would advise not going beyond an aspect ratio of 1.5 with the shim stack. The problem (as you can tell) is stability of the shim stack. You can augment the shim stack with wedges if the shim stack gets higher.

Harold Sprague

From: richard lewis <rlewistx(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: Nonshrink Grout Thickness
Date: Tue, 17 Aug 2004 15:12:56 -0500

What is a reasonable maximum thickness of nonshrink grout below a column
baseplate?   I am detailing a column base fro a steel pipe column that
supports steel roof beams in an existing building.  They are removing a
CMU bearing wall and supporting the wood framed roof with steel framing.
The roof slopes slightly.  I was thinking of making a detail where the
column lengths are the same and the slack is taken up in the grout under
the base plate.  I would ask for steel shims to set the column in place
and then grout it.

Thanks for your help.


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