Where Should I Use Greenboard?

[HerHusband]

We are currently finishing up the insulation in our new house and will be
ordering the sheetrock soon. However, I'm wondering where I should be using
greenboard instead of regular drywall?

Should I use greenboard for the entire bathroom?

Should I use greenboard in the laundry room?

What about the kitchen?

Or, will standard drywall work for all of these locations?

In other words, when is it necessary to use greenboard?

Thanks,

Anthony

[Js Walker Lazenby Jr]

Post by HerHusband
We are currently finishing up the insulation in our new

house and will be

Post by HerHusband
ordering the sheetrock soon. However, I'm wondering where

I should be using

Post by HerHusband
greenboard instead of regular drywall?

In any area with high moisture content or so-called "wet
walls," but not on walls or ceilings that will actually get
wet (where you should use tile or other surfacing over tile
backer board).

Post by HerHusband
Should I use greenboard for the entire bathroom?

Yes, except for the tub surround (wainscot), which should be
tile backer board (cement board).

Post by HerHusband
Should I use greenboard in the laundry room?

Yes, certainly on the "wet wall;" and if a relatively small
room, the entire room might well be green board, including
the ceiling.

Post by HerHusband
What about the kitchen?

On the "wet wall," unless it is to be tiled or otherwise
finished as a "splash" up to the underside of wallhung
cabinets. Then, depending on the "splash" finish materials,
you might use a more durable, more suitable material.

Post by HerHusband
Or, will standard drywall work for all of these locations?

Depends on your definition of "work." Sure, standard
drywall will work, as it has for a long, long time, but not
so well nor so long as greenboard, which is specifically
designed and manufactured for the purpose.

Post by HerHusband
In other words, when is it necessary to use greenboard?

When there are moist conditions likely to form condensation
on or about the drywall.

Post by HerHusband
Thanks,

Welcome.

Post by HerHusband
Anthony

[b***@nospam.tnx]

Post by HerHusband
We are currently finishing up the insulation in our new house and will be
ordering the sheetrock soon. However, I'm wondering where I should be using
greenboard instead of regular drywall?
Should I use greenboard for the entire bathroom?

If you wish. Common building practice here is greenboard around the
tub; standard drywall in the rest of the bathroom.

There is an argument to be made that you should use duroc -- a tile
backer -- around the tub and for shower walls -- and greenboard
throughout the bathroom because of the high moisture content.

It is not an argument I am much impressed with ... duroc here is about
fifty bucks a sheet, greenboard is 14 and drywall about 9 ... which
explains why common practice here is as I outlined.

Post by HerHusband
Should I use greenboard in the laundry room?

Not necessary.

Post by HerHusband
What about the kitchen?

Not necessary.

Post by HerHusband
Thanks,
Anthony

Welcome,

Ken

[Mach Twain]

Post by b***@nospam.tnx
If you wish. Common building practice here is greenboard around the
tub; standard drywall in the rest of the bathroom.
There is an argument to be made that you should use duroc -- a tile
backer -- around the tub and for shower walls -- and greenboard
throughout the bathroom because of the high moisture content.
It is not an argument I am much impressed with ... duroc here is about
fifty bucks a sheet, greenboard is 14 and drywall about 9 ... which
explains why common practice here is as I outlined.

Do you happen to know if there is a good sealer for the greenboard to
put on before tiling?

Mach Twain

[Nospam9212]

On 12/5/03 12:59 PM Eastern Standard Time, HerHusband ***@unknown.com
wrote...

Post by HerHusband
In other words, when is it necessary to use greenboard?

From gypsum product manufacturer, USG...

-The Gypsum Construction Handbook Centennial Edition -

Gypsum Panels-Water Resistant

A proven water-resistant base for the adhesive application of ceramic
and plastic tile and plastic-faced wall panels. Made water-resistant all
the way through. The multilayered face and back paper are chemically
treated to combat penetration of moisture. The gypsum core is made
water-resistant with a special moisture-resistant composition. The
panels are easily recognized because of their distinctive green faces.
These panels are designed for bathrooms, powder rooms, kitchens and
utility rooms. In addition, they may be used in modernization work
when the existing surfaces are removed and Water Resistant Panels
are applied directly to framing. SHEETROCK Brand Gypsum Panels,
Water-Resistant, FIRECODE C Core Panels also are used in fire-rated
assemblies that may be exposed to moisture during construction.

Panels comply with ASTM C630.

Available in four product types:

SHEETROCK Brand Gypsum Panels, Water-Resistant, Regular 1/2
thickness for single-layer application in residential construction; 5/8
thickness is also available.

SHEETROCK Brand Gypsum Panels, Water-Resistant, FIRECODE Core in
5/8thickness with a Type X core to provide fire resistance for required
ratings.

SHEETROCK Brand Gypsum Panels, Water-Resistant, FIRECODE C Core
in 1/2thickness with special core to provide fire resistance for
required ratings.

FIBEROCK Brand Panels-Water Resistant (with AQUA-TOUGH)
Finishing flexibility and superior water resistance in a single panel.
Manufactured using USG’s unique gypsum-fiber technology, these
durable panels provide water resistance superior to conventional dry-wall,
but can be installed and finished using basic drywall techniques.
Uniform composition, without face paper, is based on a uniquely engi-neered
gypsum/cellulose-fiber combination that won’t weaken if the
surface is penetrated by moisture. Panels comply with ASTM C1278,
C79 and C630.

Because FIBEROCK Brand Panels-Water Resistant is a new product,
see the current literature for the latest information about uses and
application.


Limitations

1. Adherence to recommendations concerning sealing exposed edges,painting,
tile adhesives, framing and installation is necessary for satis-factory
performance.

2. Not recommended for ceilings with framing spacing greater than 12
o.c. for 1/2board or 16o.c. for 5/8board, or for single-layer
resilient attachment where tile is to be applied or in remodeling unless
applied directly to studs.

3. Panels that would normally receive an impervious finish, such as
ceramic tile, should not be installed over a vapor retarder nor on a wall
acting as a vapor retarder.


-= Francis Yarra =-
fyarraATjunoDOTcom
http://members.aol.com/fyarra001/ads - My drywall website
http://members.aol.com/fyarra001 - My C64 website
http://members.aol.com/prsnl99 - My personal website

[Ken Willets]

Post by Nospam9212
3. Panels that would normally receive an impervious finish, such as
ceramic tile, should not be installed over a vapor retarder nor on a
wall acting as a vapor retarder.

I think this is my problem; I'm in the middle of replacing greenboard
behind a 6" tile baseboard. The other side is concrete foundation, and
the greenboard had been installed down to the subfloor, 3/4" below the
tile floor, as flush as possible to the rough foundation.

If anyone's wondering, moisture can travel quite a ways under these
conditions. Above the baseboard, the sheetrock was pretty much dry, but
below that it was soggy and moldy for a good five or six feet, with the
tile peeling off. The moisture doesn't appear to be from any unusual
source, just drips in the corner by the tub, and a few grout cracks, etc..

So in a normal wall, with no vapor retarder, is it OK to do a tile
baseboard on drywall down to the floor like this? I just looked at a
drywall book, and it recommends keeping the rock 1" above the floor in
general. I haven't found specific recommendations for tile baseboards
though.

Needless to say, the new drywall is well off the floor.