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RE: 16" thick CMU wall

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I have built 16” CMU walls using two wythes of 8” block wall by:


1) removing the face shells on one side

2) tying them together with high-lift grout ties

3) provide temporary shoring during grouting

4) add #4 ties between the wythes anchored by horizontal bars at ea. face


Since your wall is only 4’-0” high you can forgo #2 and #3


You can get 16” block from some manufacturers but they can be of limited availability and types.


-----Original Message-----
From: Joe Grill [mailto:jgrill(--nospam--at)]
Monday, November 08, 2004 2:42 PM
To: seaint(--nospam--at)
Subject: 16" thick CMU wall


I have been ask (by the architect, owner, contractor and everyone else in town) to change the design of a concrete retaining/basement wall that was 12” thick to a CMU wall.  The 16” thickness will reduce to 12” at 4 ft from the footing and then to 8” at 8 ft from the footing.  At the base the CMU will require a 16” thickness.  I am assuming the construction will be 2 wythes of 8” CMU.  Is there any special detailing required to make the double wythe work?  The wall will be solid grouted and will have quite a bit of vertical steel in both faces.  I also have horizontal bars at 16” o.c. Is there anything else required?


Joe Grill


Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying

1146 W. Hwy 89A Suite B

Sedona, AZ  86340

PHONE (928) 282-1061

FAX (928) 282-2058