Replies

1. 
   4Lorn1 | Jul 21, 2004 05:14am | #1

   i don't know about any 'sag-resistant' GDW. I have been told, by someone who plays the drywall game, that 'X-rated', fire rated drywall, is stiffer. I must say that I have noted this also. Seems to have something to do with the long-strand fiberglass fibers that is added to help keep it together in a fire.

1. 
   Piffin | Jul 21, 2004 05:33am | #2

   Type X is also denser, heavier, and more sound resistant, as well as being commonly available 

    

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1. 
   Taylor | Jul 21, 2004 11:33am | #3

   Does Type X use fire retardent chemicals? I've recently become wary of FTC because of concerns in Europe.....or is it just modified structurally to have better integrity in a fire? I have been considering Type X since there will be foam insulation in the attic....

1. 
   calvin | Jul 21, 2004 01:31pm | #4

   taylor, the drywall itself is fire retardent.  In high heat, gypsum releases a small amount of water contained in its makeup.  The type x has fibres which help bind the gypsum together especially in a high heat situation.Remodeling Contractor just outside the Glass City.

   Quittin' Time

2. 
   Piffin | Jul 22, 2004 03:40am | #5

   It has the stabilizing fibres and is compressed a little denser which prevents air flow more.

   Thje fire rating is simply a measure of how long it takes a certain temp of fire to burn through to the other side. You can have a totally wood door that is a one hour fire door in spite of it's combustable nature - though most are not.

    

    

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2. 
   crosscutter1 | Jul 22, 2004 04:04am | #6

   on ceilings i have used what they call resilent channel it gets screwed or nailed to the joists and runes the oposite way on the ceiling . the channel floats with the weight of the drywall& levels its self by weight .

   i feel it works great cause i prfer to insulate the ceiling by face stapling as opposed to inset stapling . it also gives dead airspace between the rock & insulation

1. 
   Taylor | Jul 22, 2004 06:00am | #9

   On RC: I went to order some today and was advised to use metal furring instead if my primary concern was levelling (it is, I have lath overhead). I was told that RC is a royal PITA to work with.

   On sag-resistant DW: I ordered Type X 5/8" today. Some of the panels are 12' long. Next order I will be looking for 14' long or (if I can find it) 16' long panels. At these lengths, am I better advised going with sag-resistant (if I can find it?). As I said, Type X is attractive given foam insulation above, but not if it means sagging ceilings.....

1. 
   HeavyDuty | Jul 22, 2004 06:36am | #10

   >>I was told that RC is a royal PITA to work with.

   Not really. It does give a little bit when you screw the rock on but if you have the proper screw gun you would be fine. It does reduce sound transmission though if that's important to you.

   16' type X? You'll need a lift to get it to the ceiling. Sag resistance does not depend on the length the DW comes in, it depends on the thickness and type.

3. 
   BMan | Jul 22, 2004 05:20am | #7

   I used sag resistant gypsum board on exterior soffits. It is truly sag resistant- much more so than type X. It was pretty hefty, so I don't know about lighter than 5/8" type X. Experienced some water damage to the soffit, and it held up extremely well. You would not be a "beta-tester", since this product is used often on exterior soffits.

1. 
   HeavyDuty | Jul 22, 2004 05:34am | #8

   Is it rated for exterior use? I don't like the look of aluminum nor the texture in painted ply. So this may be something that I would consider.

1. 
   BMan | Jul 22, 2004 11:46am | #11

   Yes, it is rated for exterior ceiling use. The area should not be subject to rain, so soffits are OK. You have to use setting type joint compound. Include control joints often.

   BMan