Sheet rock mud on hardboard

Posted by jamesgangnc on February 1, 2009, 12:16 pm

> Andy comments:
> My thanks to all who have posted now and in the future...
> I have taken a square foot of hardboard and plastered it with
> joint compound....
> When it dries, I will test it, flex it, beat it, and try to
> determine
> the "stickitivity"..... and I'll try to report back here what I have
> learned...
> It'll take at least a day.
> I don't understand why hardboard can't be used as panelling or
> why it would be prohibited by code. It is not prohibited where
> I live, and I'd like to know the reasoning for why some codes
> would not permit it.....
> Thanks,
> Andy in Eureka, Texas

Wallboard has a higher flame rating. Fire propigates through it more
slowly. Hardboard does not meet code in this use. I would rip it out and
do it right. Your test is only going to test the immediate adhesion. You
also need to consider issues of mosture absorbtion and differing
expansion/contraction rates.

Posted by Handplanes on February 1, 2009, 12:22 pm

> Andy comments:
> My thanks to all who have posted now and in the future...
> I have taken a square foot of hardboard and plastered it with
> joint compound....
> =A0 When it dries, I will test it, flex it, beat it, and try to
> determine
> the "stickitivity"..... and I'll try to report back here what I have
> learned...
> It'll take at least a day.
> =A0 =A0I don't understand why hardboard can't be used as panelling or
> why it would be prohibited by code. =A0It is not prohibited where
> I live, and I'd like to know the reasoning for why some codes
> would not permit it.....

You are not required to understand code requirements, or to agree with
them. You are required to conform to them. The reason hardboard is
not acceptable as a wall sheathing is because of flame spread ratings.
http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?nam=
e=3DBOLT.GuideInfo&ccnshorttitle=3DHardboard&objid=3D1074291239&cfgid=3D107=
3741824&version=3Dversionless&parent_id=3D1073984676&sequence=3D1

Georgia Pacific's site lists "wall and ceiling panels" as uses for
hardboard, but that is for paneling which is required to be on top of
plaster or drywall to meet code requirements.
http://www.gp.com/build/productgroup.aspx?pid=3D5757

There are hardboards that meed the flame spread rating requirements,
but unless your product is marked as such, it doesn't.

Posted by Dave in Houston on February 1, 2009, 2:29 pm

> Andy writes:
> I have a room done in 4 X 8 sheets of hardboard, 1/4" thick, from
> Home Depot. The "rough" side is the room side. The "rough" side
> has a grain on it about like screen wire. The "slick" side is shiny.
> Has anyone tried to use joint compound on the "rough" side of
> hardboard to coat or texture it ?
> I am concerned if the compound will "stick" as well as to drywall,
> and
> whether I should wet the hardboard before applying it ?
> Thanks for any informed opinions on this...

I agree that the BEST course would be to remove the wallboard and
install new drywall. The hardboard should come down in whole sheets.

If you insist on texturing the hardboard then Liquid Nails the joints as
flat as possible with a putty knife. Roll the entire surface(s) with a coat
of KILZ. Mud texture. Paint.

Dave in Houston

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Sheet rock mud on hardboard - Page 2