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RE: Fireproofing

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Does any one know when is the structure steel building required fireproofing?  Couple years ago I designed an building consits of concrete over metal deck and supported by metal joists.  The metal joist rested on steel beam.  I assumed that the steels required fireproffing, but it's not.  I don't know why it's not required fireproofing? 

Eric Ober <eober(--nospam--at)> wrote:

I thought I?ve seen fireproofing weighing anywhere from 15 pcf up to 40 pcf (Grace FP Products).  Assuming a W18x35, surface area (minus top of top flange) = 4.34 sf/ft (AISC Manual).  For each inch of FP, weight of FP = 5.5 plf to 14.5 plf.  Depending on how much FP, average weight is probably at most in the 2 to 3 psf range and I generally lump that into the ?Miscellaneous? load.  Special situations might require a closer look.


-----Original Message-----
From: Paul Feather [mailto:pfeather(--nospam--at)]
Sent: Wednesday, August 27, 2003 10:38 AM
To: seaint(--nospam--at)
Subject: Re: Fireproofing


practically zero.  If the spray on fire protection is more than two or three pounds per linear foot on a 24" beam I would be surprised.  Typically spray on is accounted for in the miscellaneous loading.  If the spray on is a factor in the beam design, you are cutting things way too close. :-)



Paul Feather PE, SE

----- Original Message -----

Sent: Wednesday, August 27, 2003 5:57 AM

Subject: Fireproofing


Anybody got a good rule of thumb uniform dead load for sprayed on fireproofing of steel beams?


D. Matthew Stuart, P.E., S.E., P.Eng.

Senior Project Manager

Schoor DePalma Engineers and Consultants

Manalapan Structural Department

200 State Highway Nine

Manalapan, NJ 07726

732-577-9000 (Ext. 1275)

908-309-8657 (Cell)

732 -431-9428 (Fax)



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