On Fri, Dec 21, 2012 at 10:11 AM, Wayne <wmc_st@xxiii.com> wrote:
> I grew up in a 1917 vintage house with plaster over wood lath. Have lots of
> experience patching plaster cracks, and I've spread a little drywall mud
> over the years. It's been years ago (1980s) but I think it's still relevant
> to current materials: plaster cures (crystallizes) and expands, like cement;
> mud dries and shrinks. Mud is NOT good in large layers or cracks.
>
> We had a kitchen ceiling cave in from a water leak above. Dad's initial
> thought was rip it all out and drywall the ceiling. But we were still able
> to find a guy that was an expert plasterer. He laid a couple coats on it,
> didn't have to do much if any sanding, and it was ready to prime & paint. I
> don't remember exact details (been 25 or so years ago) buy I think he used
> something like tile backer-board or metal lath to replace the water damaged
> stuff, and laid a skim coat over the whole thing.
>
There are sheet goods (like drywall, but with a different coat, and
maybe a different core) available for plastering, they're called 'blue
board' (which is no doubts someone's trademark). They hang like
drywall, and then get a skim goat of plaster. Metal lath still gets
used, but I think just for repair work, anyone doing a big area uses
the board stuff.
> If you can still find a plasterer, I'd try them. Heard there's been some
> resurgence in the trade. Some high end houses go for a full skim coat of
> plaster over drywall, instead of just mud joints that dang near always show.
>
> -w
>
>
> On 12/21/2012 9:35 AM, Tim wrote:
>>>
>>> My whole house has a sand texture ceiling- not a sprayed on coating
>>> like
>>> popcorn, but 1/4" - 3/8" thick plaster type stuff with very coarse
>>> grit sand
>>> on the surface. Impossible to scrape off. Also impossible to match
>>> when you
>>> patch a hole of which I have many. So i need to cover it. Laying
>>> drywall over
>>> it is easiest but I'd need to do a lot, plus the light holes. So I'm
>>> looking
>>> into covering it.
>>>
>>> Tried tonight with watered down mud and it should go in 2-3 coats. but
>>> I also
>>> thought using actual plaster might work, and in one coat. Will plaster
>>> adhere
>>> to this stuff? Doesn't seem to be painted and I only need 1/4" max. Or
>>> should
>>> I just use more drywall mud? I'm decent with the technique so it won't
>>> take
>>> forever, but I only want to do it once.
>
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--
David Scheidt
dmscheidt@gmail.com
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