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RE: Finishing a curved ceiling - need some advice[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Finishing a curved ceiling - need some advice
- From: William Keil <WJK(--nospam--at)brph.com>
- Date: Wed, 13 Oct 1999 15:57:22 -0400
< 1. Remove and replace the ceiling to allow the radius to be formed from two layers of 1/4" gypsum board which is intended to allow the layers some room for movement. I believe that the USG book covers special conditions where curved surfaces are covered. > We just finished several interior jobs with curved walls/ceilings. The contractor was very familiar with the techniques required for this construction using gypsum board. They were very adamant about using the layered system. For walls, two layers of 1/4" were used. For ceilings, two to three layers were used depending on the radius. < 2. Remove and replace using metal "Hat" channels between the joists and beams and the Gypsum to allow for flexibility in the ceiling without transference of cracks in the gypsum. > In my opinion, flexible gypsum board anchors would be more appropriate. These anchors are usually specified for acoustical control between rooms/floors. Make sure the contractor installs them properly because we inspected a wall that had all of the anchors flattened which defeated the whole purpose of putting them in. < 3. I also suggested that the owner might consider finishing the ceiling in an elastomeric finish which would stretch with the movement in the roof. > The elastomeric finish would conceal the cracks; however it will conceal other tell-tale signs of structural cracking and/or water infiltration. We inspected a masonry structure with an elastomeric finish. It looked great on the outside but water had no way to get out and this caused extensive corrosion of the structural steel frame and deteriorated the masonry. < 4. I have heard that the ceiling should have been finished in lath and plaster which would have been more forgiving for movement and creep as the lath would allow some play in between the materials. > Installing a lath and plaster ceiling on black iron channels with hangers is the system I would recommend for this application to allow for the greatest flexibility between the ceiling system and the roof framing system. Does anybody who inspected the construction know if the contractor taped the joints? I know this sounds stupid but I've seen this happen in houses and it usually occurs at 3 p.m. on a Friday and nobody remembers to finish the job on Monday morning. William J. Keil, P.E.
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