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RE: grouting requirements for fire resistant

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The required fire resistance of a cmu wall is determined by the code requirements and should be indicated on the design documents. The manufacturer, then, must provide the type of block that meets that fire rating. 

Some blocks have 2 cells, some have 3 cells, some have different flange thicknesses, some are lightweight, others are normal weight, some are hollow, some are almost completely solid. For example, an 8", 1 hour block might look like a normal unrated block, but a 4 hour block is almost completly solid.

As far as grouting of an existing wall to increase the fire rating, it can be done, but you might want to conservatively assume that you have normal weight block (since that has a lower fire rating than lightweight) and also fill every cell to create increased fire rating at every location in the wall. 

Jim K.

-----Original Message-----
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
Sent: Friday, June 06, 2003 7:51 AM
To: seaint(--nospam--at)seaint.org
Subject: grouting requirements for fire resistant


The UBC gives the fire resistive periods for cmu in terms of "equivalent 
solid thickness," which is a nebulous term at best and, as far as I can 
determine, is undefined.  From tables I have seen, the "equivalent solid 
thickness" for fire resistive periods is not related to the solid area of the 
cmu, smearing the web area, or anything else.

I would suggest contacting NCMA on this subject.

HTH

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

E. Suk wrote:

. > Hello,

. > I was wondering were I could find a codified requirement for grout (fully
. > grouted or not) for a fire resistant CMU wall.  The wall is a non
. > loadbearing, external partition.  Thanks

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