HEAD-OF-WALL DETAILS

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Author Message Wayne Yancey Senior Member Username: wyancey Post Number: 384 Registered: 05-2005 Posted on Wednesday, October 24, 2007 - 11:25 am:    This is not a true product topic but I am tapping into the collective experience of those who post to 4specs.com. It never ceases to amaze me that what I have seen done on the job site, no one seems to know how it was accomplished. We do highrise condos with concrete frame. The concrete floor slabs receive a skim coat of plaster or some such product, painted white. The designers do not want a joint exposed to view at the head of the wall. We toured a finished condo in Vancouver BC with the the wall to slab interfaces with the look and feel of a typical gypsum board to gypsum board inside corner. Someone out there (Anne W.) must have done this before for rated and nonrated partitions. I am looking for details, details, details. All offers greatfully accepted. Please e-mail suggestions or solutions to wyancey@weberthompson.com Thanks Wayne Colin Gilboy Senior Member Username: colin Post Number: 115 Registered: 09-2005 Posted on Wednesday, October 24, 2007 - 11:40 am:    If someone sent me the details I could host them on 4specs and link from this thread. This would serve as a valuabe resource. Kenneth C. Crocco Senior Member Username: kcrocco Post Number: 114 Registered: 04-2003 Posted on Wednesday, October 24, 2007 - 11:49 am:    There are two conditions to consider: partitions interior of the unit and those partitions that separate units. The partitions separating units require, movement, fire, and acoustic characteristics and require partition head details that carry fire and acoustic ratings (and esthetic concerns you mentioned). This can be tricky, but take a look at UL System Nos. HW-D-0003, HW-D-0016, and HW-S-0009 for examples of a gyp board partition to flat slab concrete. (Also look at the bottom detail BW-S-0001 and those following 2, 3, 4, etc.) Wayne Yancey Senior Member Username: wyancey Post Number: 385 Registered: 05-2005 Posted on Wednesday, October 24, 2007 - 12:40 pm:    Ken, Thanks and we are aware of the 2 conditions you highlighted. The head of wall details will have to satisfy fire, smoke, and acoustic requirements. What I need are details on how to achieve the no-joint look at the end of the day. I will check out your suggestions. Thanks Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 732 Registered: 02-2003 Posted on Wednesday, October 24, 2007 - 12:40 pm:    HOW ABOUT THE HEAD-OF-WALL DETAILS AT WWW.FIRETRAK.COM. AND USE A THIN, J-MOLD [OR OTHER TRIM SHAPE] AT THE PERIMETER OF THE CEILING, TIGHT AGAINST THE WALL TO FINISH THE CEILING COATING? Steven Bruneel, AIA, CSI-CDT, LEED-AP Senior Member Username: redseca2 Post Number: 77 Registered: 12-2006 Posted on Wednesday, October 24, 2007 - 12:57 pm:    In a cost is no object universe you could hang the wall from the upper floor slab and conceal a nested double sill track behind an appropriately expensive base trim. Ronald L. Geren, AIA, CSI, CCS, CCCA, SCIP Senior Member Username: specman Post Number: 557 Registered: 03-2003 Posted on Wednesday, October 24, 2007 - 01:00 pm:    The key problem that I see is concrete creep of the elevated floor slabs. The head-of-wall conditions will need to accommodate that slow, downward movement. If the gypsum board is tight against the concrete deck, it will eventually crack or crush over time. Wayne, how old was the building you looked at? If it's new, I bet if you toured the same building a few years from now it won't look so nice. John Regener, AIA, CCS, CCCA, CSI, SCIP Senior Member Username: john_regener Post Number: 348 Registered: 04-2002 Posted on Wednesday, October 24, 2007 - 01:02 pm:    What MF 2004 Section number and title should be used for skyhooks? Ronald L. Geren, AIA, CSI, CCS, CCCA, SCIP Senior Member Username: specman Post Number: 559 Registered: 03-2003 Posted on Wednesday, October 24, 2007 - 01:15 pm:    Division 50 Imaginary Structures Section 50 05 13 Common Sky Hooks for Imaginary Structures Wayne Yancey Senior Member Username: wyancey Post Number: 386 Registered: 05-2005 Posted on Wednesday, October 24, 2007 - 01:19 pm:    Ron, Building we walked through is new, nearing occupancy. I had thought about Ralphs suggestion before. It will add a crown molding look that will be nicer than cracked drywall mud or white sealant or post painted sealant. I think it has a merit. Requires a good technicain to cut and form the inside/outside mitered corners. I think I may use this as the basis for design. Thanks to all the usual suspects for replying. I will go forward with Firetrack. Wayne