exterior fire -rated column covers

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Author Message Julie Root Senior Member Username: julie_root Post Number: 20 Registered: 02-2004 Posted on Wednesday, September 28, 2005 - 04:34 pm:    In looking for an alternative to intumescent coating, I am looking for a way to clad small round columns (4" dia.) that need to be one hour rated. I have looked into fire-trol and it is a possibility, but so far it seems to be the only one and I am working on a public bid job. I am comfortable with intumescent coatings as I have been successful with an exterior application by specifing wait times between coats. In this case my Owner is looking for options that might have a better constructability factor. Any thoughts would be appreciated. George A. Everding, AIA, CSI, CCS, CCCA Senior Member Username: geverding Post Number: 72 Registered: 11-2004 Posted on Wednesday, September 28, 2005 - 05:00 pm:    Fill them with water? I remember hearing about this technique years ago when I was an architecture student (Mies or someone else famous did it?), but I have no experience with it, and doubt we would ever use it in the freezy midwest. It has always held my interest, however, as a way of exposing steel. Not sure how this would meet the "constructablity factor", either. Julie Root Senior Member Username: julie_root Post Number: 21 Registered: 02-2004 Posted on Wednesday, September 28, 2005 - 05:07 pm:    I like that idea. Are you familiar with Wet Design? They do all the fancy water shooting things like in Vegas. Maybe I could get them to design something that simply has continous water running through them, but then I guess I am into marine grade SS or someother type of coating. Copper I guess would work, but would have to work on the structural design. Always fun to dream. Julie Root Senior Member Username: julie_root Post Number: 22 Registered: 02-2004 Posted on Wednesday, September 28, 2005 - 05:37 pm:    In this research would someone clarify for me the difference in a mastic vs. intumesent coating? UL uses both terms and I a trying to understand the difference. Dave Metzger Senior Member Username: davemetzger Post Number: 137 Registered: 07-2001 Posted on Wednesday, September 28, 2005 - 06:18 pm:    Mastics are thicker-build products. Where appearance matters, we typically specify a thin-film intumescent fire-resistive coating such as A/D Firefilm II by A/D Fire Protective Systems, Inc., Albi Clad TF By Albi Manufacturing,, or Nullifire S607 by Carboline Co. (there are others also). These can be top-coated, and typically have a smoother surface than do the mastics (tho it is difficult not to have some "orange-peel" texture). When I lived in London in the mid-70's, I remember an office building was constructed that was fireproofed using water within the hollow tubular structural framing. But the framing was stainless steel, not carbon steel (rust issues), and the water was spiked with anti-freeze. Needs room to expand inside the framing also.