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.
From: Joe Grill
Sent: Monday, November 08,
Subject: 16" thick CMU
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?
R. Grill, P.E. (Structural)
- Wesnitzer, Inc.
Engineering and Surveying
Hwy 89A Suite B