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RE: Specifying CMU block weights

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Thanks for all the responses on the block weights. 
Seems like the "safe" bet is to continue to spec
normal weight CMU for most of my general needs.  If
the contractor or architect requests a specific
product for some reason, then its worth considering
the alternatives.

Much appreciated,
Jim

--- Roger Davis <rdavis(--nospam--at)sdsarch.com> wrote:

> Lightweight blocks may cost more per unit but the
> labor cost of handling the
> units may be less.  The installed cost will vary
> with locality.
> 
> Normal weight blocks seem to be more brittle and
> have more chipping as a
> result of handling and shipping.  That means more
> waste or a less attractive
> wall or both.  That also seems to vary with
> locality.
> 
> Roger C. Davis
> Architect
> SDS Architects, Inc.
> 205 N. Dewey Street
> Eau Claire, WI 54703
> (715) 832-1605
> 
> 
> -----Original Message-----
> From: Jim Wilson [mailto:wilsonengineers(--nospam--at)yahoo.com] 
> Sent: Wednesday, January 26, 2005 8:11 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Specifying CMU block weights
> 
> What are the do's and dont's for specifying CMU
> block
> weights in the northeast?  I am under the impression
> that normal weight blocks are to be used for
> exterior
> exposed CMU walls due to water resistance.  Is water
> the governing factor, or are there other design
> components to this decision?
> 
> Would medium weight or lightweight block then be
> specified only for interior partition walls, or
> would
> they also be specified for exterior walls that are
> protected behind a vapor barrier, such as behind a
> brick face?
> 
> I am guessing that it would it be too confusing to
> mix
> block types on a project for interior and exterior
> walls?  Seems safer to use normal weight block
> unless
> medium or lightweight are explicitly required for
> some
> reason.
> 
> TIA,
> Jim Wilson
> 
> 
> 		
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