Replies

1. 
   Guest_ | Nov 05, 1999 06:56am | #1

   *
   My sheetrockers told me that green board cannot be used on ceilings, even with rafters !6"oc. "It will fall apart", they said.

1. 
   Guest_ | Nov 05, 1999 06:59am | #2

   *That's the same thing I've been told - greenboard is for walls only. I don't think it has the fibers running through it, or some such. - jb

1. 
   Guest_ | Nov 05, 1999 07:50am | #3

   *You mean the grain is wrong.

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   Guest_ | Nov 07, 1999 04:04am | #4

   *Don't think it's a grain thing -- the mfr just says don't do it. The core must be different. reg. d'wall ceiling should be OK unless you let the bath get too damp -- condensation and such -- and if you do you'll have other problems anyway. Use the fan!Our county now says that if greenboard is used in bath, vapor barrier must go OVER it (inside). I'm not sure how that works... I'm just not going to use the stuff period.

1. 
   Guest_ | Nov 07, 1999 05:24am | #5

   * James,

   This is the quote from USG on their WR board. . ."SHEETROCK® brand Gypsum Panels, Water-Resistant

   Available in 1/2" and 5/8" thicknesses, the panels are a proven water-resistant base for ceramic and plastic tile and plastic-faced wall panels. Made water-resistant throughout. Available with shallow tapered edges in regular water-resistant gypsum panels, FIRECODE Core and FIRECODE C Core. The panels comply with ASTM C630.

   Limitations: Water-Resistant panels are not recommended for ceilings with framing spacing greater than 12"o.c., for single-layer resilient attachment where tile is to be applied or in remodeling unless applied directly to studs. Should not be installed over a vapor retarder nor on a wall acting as a vapor retarder unless it will not be tiled or finished with an impervious paint. Not intended for use in areas subject to constant moisture, gang showers and commercial food processing; DUROCK® Cement Boards are recommended for these uses. Width: 4' Length: 8', 10' or 12' Edges: tapered Finish: green treated paper, suitable for receiving tile, paint or wallpaper"

   I've used green board on ceilings in bathrooms for many years with no ill effects. I don't use it at all in any wet areas such as tubs or shower. In the "general" areas of the bath it performs well and provides added protection. I think the reference in the quote referrers to the use of "resilient channels", sometimes called "Chicago Bar". This application is most often seen in commercial jobs. These "suspended" ceiling use black iron and pencil rod in combination with resilient channel (Chicago Bar).

   Joseph Fusco View Image

2. 
   Guest_ | Nov 07, 1999 06:41am | #6

   *Thank You, I've been blocking in 24oc trusses to 12oc for years to put up green board in bathrooms.