exterior sprayed fireproofing

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Author Message Ellis C. Whitby, PE, CSI, AIA, LEED® AP Senior Member Username: ecwhitby Post Number: 142 Registered: 03-2003 Posted on Tuesday, April 17, 2012 - 11:56 am:    We have a project where we have to fireproof the metal roof deck in various structures, including exterior eyebrows. Any recommendations for products that are moisture resistant? The eyebrows are enclosed with metal panels, sheathing and an air barrier, so in theory there will be no water. It’s also in a dry climate (under 9 inches per year. Climate Zone 3). Nevertheless, in the spirit of “belt and suspenders and staples” I am looking for something that is moisture resistant. Is there an advantage to portland cement versus gypsum cement? Any recommendations? Richard L Matteo, AIA, CSI, CCS Senior Member Username: rlmat Post Number: 490 Registered: 10-2003 Posted on Tuesday, April 17, 2012 - 12:02 pm:    You definately do not want to use a gypsum-based fireproofing on the exterior. Portland cement is better, but still subject to moisture issues in exterior applications. I would look into the intumescent fireproofings. Thet offer a greater degree of moisture resistance over the Portland cement based products. Look at the Carboline products. Wayne Yancey Senior Member Username: wayne_yancey Post Number: 519 Registered: 01-2008 Posted on Tuesday, April 17, 2012 - 12:08 pm:    Ellis, Most recent project with exterior fireproofing used an intumescent mastic coating for exposed exterior roof structure and columns. Albi Manufacturing "Albi Clad 800." Richard L Matteo, AIA, CSI, CCS Senior Member Username: rlmat Post Number: 491 Registered: 10-2003 Posted on Tuesday, April 17, 2012 - 01:50 pm:    Also Carboline Nullifire S605. Since both the Albi Clad 800 & the Nullifire S605 are solvent based, check your local air quality regulations. Guest (Unregistered Guest) Unregistered guest Posted on Tuesday, April 17, 2012 - 08:36 pm:    thin-film intumescents are comparatively very expensive. unless clearance for application access or thickness are specific project issues (other than pure aesthetics), you might want to consider medium or high(er) density portland cement products, e.g., Grace Monokote Z-106 or Z-146 (or Carboline Pyrocrete series). Richard L Matteo, AIA, CSI, CCS Senior Member Username: rlmat Post Number: 492 Registered: 10-2003 Posted on Wednesday, April 18, 2012 - 12:33 pm:    Grace Monokote Z-106 and Z-146 are not intended for exterior use. Grace does have a Z-156/Z-156T which is available for exterior use. Carboline 7HD @ 40pcf, has the highest density, but I still lean towards the intumescents. Although they are generally more expensive than the cementitious type, they have a much better in-service performance in exterior environments. Carboline's Nullifire S605 or Albi 800 would both be appropriate for your application. I was involved with one of the first applications of an Albi product in an exterior application about 40 years ago.