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Re: Cost Analysis

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Another issue might be that wide flanges have a shorter fabrication lead
time, which gets the building occupied more quickly.  This saves the owner
money on interest for construction loans, leaving more money for material,
if structural steel is more costly.  (If it is a net savings, don't count on
seeing it enter your pocket.)  Bar joists have a longer lead time here than
structural steel.

Conrad Guymon, P.E.

----- Original Message -----
From: "Jason Kilgore" <jkilgore(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Thursday, March 22, 2001 8:34 AM
Subject: Cost Analysis

> We currently have a disagreement in our office about relative pricing of
> different floor construction methods for office-building type usage (fire-
> proofed or not).  Most of our work is in the Kansas City area, where
> rule supreme and labor costs are high.
> Both of the owners of my company are adamant about one of the methods,
> several of the younger engineers disagree (but are out-ranked, so the
> owners'
> method is used).
> If the disagreement continues, I'm going to do a mock building design
> the two methods and have a few construction companies price it.
> Here are the two sides of the issue (very generalized).  Any comments?
> One side:
> Use WF girders, steel bar joists at 2'0" - 2'6" o.c., with light-gage form
> deck (0.6C28).
> Advantages:  Easier installation, lighter & easier-to-handle pieces,
> deck, no shoring.
> Disadvantages:  Short spans require heavier joists for fire-rating, fire-
> proofing more labor-intensive (requires wrapping each joist in mesh),
> more pieces to install and fire-proof
> Other side:
> Use WF girders, WF beams at 6'0"-8'0" o.c., heavier composite decking.
> Advantages: Far fewer pieces, WF beams usually meet min. sizes for fire-
> ratings, easier and faster to fire-proof.
> Disadvantages: Pieces are larger, installation more difficult, deck far
> expensive, sometimes requires shoring for casting.
> ----
> Jason W. Kilgore, P.E.
> Leigh & O'Kane, L.L.C.
> jkilgore(--nospam--at)
> (816) 444-3144