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RE: STEEL ROOF DECK: Question About Using Lightweight Concrete Fi ll

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Bill,

Lightweight Concrete fill is used all the time for floors and roofs. If
there is composite steel construction or if there is a fire rating
necessary, lightweight conc. is a good solution. It also gives you a rigid
diaphragm. You need less thickness of lightweight concrete than normal
weight to achieve the same fire rating. Roofs are the only time you would
really ever not see metal deck getting filled and it is a flexible
diaphragm. Roof decks should be vented decks when using concrete fill. So
the answer is yes it is common, there may be fire reasons for it, and there
may be structural reasons for it.

-gerard
SJ, CA

-----Original Message-----
From: Bill Polhemus [mailto:bill(--nospam--at)polhemus.cc]
Sent: Thursday, November 15, 2001 2:39 PM
To: seaint(--nospam--at)seaint.org
Subject: STEEL ROOF DECK: Question About Using Lightweight Concrete Fill


Every now and then, just for fun, I actually bother to look at some of the
Archy's details, and often I find the most amazing things. For example, I
see that he has called for "lightweight concrete" as a fill on the roof deck
on which the built-up roofing is to be applied. I'm used to seeing something
like rigid board, or maybe poured gypsum. This is the first time I've seen
"lightweight concrete." It just isn't that usual here on the Texas Gulf
Coast.

I usually use something like Vulcraft 1.5 B for the roof deck. But I can't
really see where that would be appropriate if "lightweight concrete" is
going over it.

Any comments?



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



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