Intumescent Paint

[osubae]

Does anyone have any experience with intumescents relating to structural steel? Particularly the minimum steel thicknesses required to allow the use of this fireproofing. I have found ASTM E-119, UL X-625, X-628, and N-607. For Beams it appears the minimum steel thickness is 1/4", but columns a W8x24 is acceptable and has a web thickness of 0.245". I also know that there are certain humidity levels that will negate their function, and I am trying to use in a fitness center with basketball courts. Anyone know the max humidity level?

thanks in advance

 

[HgTX]

You may get better answers over in forum332

Let us know if you do that & post a link back here, so that anyone offering an answer here knows to go to the other thread instead. (You may also consider, once you've posted in the other forum, red-flagging this thread and having site management remove it so there aren't two parallel threads with responders unaware of each other.)

Hg

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[jike]

Testing for intumescent paint and other forms of fireproofing are tested based on specific beam sizes. There are formulaes (in UL book) to adjust the required thickness of protection for sizes different than that tested. Fireproofers and intumescent paint manufacturers are familiar with these formulaes. I am sure a W8x24 and smaller sizes are OK as long as the thickness of protection is adjusted. For more information, contact one of the intumescent manufacturers.