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RE: STEEL ROOF DECK: Question About Using Lightweight Concrete Fill

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I spoke to the Architect and as it turns out, he had his draftsman import
stuff from another job, and that was what they ended up with. He said he
doubts that's what they'll use, but he's waiting for the "final roof spec"
(I thought the ARCHITECT selected this, but perhaps he's got a consultant or
something. I don't think it's a major building code issue, because this is
in Brownsville-where they probably have no code official).

William L. Polhemus, Jr. P.E.
Polhemus Engineering Company
Katy, TX, USA
Phone (281) 492-2251
FAX (281) 492-8203
email bill(--nospam--at)

-----Original Message-----
From: Davis Parsons [mailto:dparsons(--nospam--at)]
Sent: Thursday, November 15, 2001 5:11 PM
To: seaint(--nospam--at)
Subject: Re: STEEL ROOF DECK: Question About Using Lightweight Concrete Fill
Several architect clients I had in the past used the term "lightweight
for the product "insulating concrete" (Zonolite, Perlite, Elasticell, etc).
they wanted on the roof was EXTRA-lightweight concrete.  Years ago, a Post
Office under construction in a town northeast of Houston collapsed when the
contractor placed what was called lightweight concrete on the plans for the
roof. The design intent was for insulating concrete fill to be used on the

If they are trying to achieve a UL Class 90 uplift rating on the roof, then
of the cementitious fill would be appropriate if the use of mechanical
to hold the roof insulation is ruled out.

If the architect truly wants lightweight concrete, then I think you need to
a "C" or "VL" deck. I think this would be overkill for the roof structure.

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