I am turning a porch that was originally part of the outside wall of the
house, into an interior room. I want to make the two walls that are now
stucco, look smoother. Does not have to be drywall smooth, maybe kind of a
venetian plaster look. Any ideas how I would do this?
Since you are going to have to open up parts of the wall to make
your room legal as far as electrical code dictates, you may as
well just sheetrock over the wall when you are done adding the
proper number of electrical receptacles for your new interior room...
Several skim coats of stucco mix, applied over a few days would make
the two walls smooth.
I can't speak, if the walls are painted or how the skim coats would
stick on painted stucco.
Are the exterior walls a heavy knock down texture?
It appears that they have been painted one time and the are very rough
stucco. The mechanical bond will probably be fine I would think. I did not
know if you could use the stucco mix to smooth the walls out to the height
of the bumps on it now or slightly higher so it would kind of look like
plaster once painted. I really do not want to tear them down and sheet rock
Plaster weld (or whatever is available in your area) wouldn't hurt.
I can't see the texture from my house, but if it isn't too heavy, you
could use Durabond (or whatever setting type joint compound is
available) to fill it out.
1. One or more buckets of drywall taping compound (drying type, not setting)
3. Trowel it on, try to keep as smooth as possible.
4. When it is dry (next day or longer) take a large, damp sponge and start
wiping. As you wipe, the compound will be removed from high spots and
deposited in low ones. If it looks good after it dries, prime and paint; if
not, go back to #3.
What I have read is that the gypsum based material is very sensitive to
moisture and that you need an air space between like a lath. However, that
being said, just how much moisture are they talking about. Being the wall is
inside are they talking about real humid days, or direct contact with a
substantial amount of water. The drywall compound would be the easiest to
do, but will it last.
Dryng type joint compound isn't gypsum, it is calcium carbonate (powdered
limestone) and starch. OTOH, the setting type compound is gypsum (plaster).
That's why it sets. All that doesn't much matter, just a point of order :)
It is true that drying compound will resoften with moisture; that's why you
can smooth it with a damp sponge. It is also true that an airspace would be
better. The question is, how wet do these walls get? If they feel damp, DW
compound wouldn't be good. Even if they did feel a bit damp, the compound
isn't going to go sliding off but you would most likely have problems with
Just humidity in the air is NP. The interior walls on my screen porch have
a DW compound "stucco"; it has been so humid the last few weeks that just
blinking causes one to break out in a profuse sweat but the "stucco" is
If it were me, I'd tape a piece of clear plastic onto the wall and see if I
got any water condensing on the plastic. If no, compound away to your
hearts content; if yes, it depends on how much...if any appreciable amount
(which I doubt if the walls are painted) then a sealer such as Seal Krete
might be in order first.
You could also use thinset instead of compound. With it, it wouldn't matter
if the walls oozed a tad but you couldn't smooth it with a sponge after it
sets; before, yes. By "wouldn't matter" I'm thinking of adhesion; if the
walls transmit moisture you'd have problems with paint regardless of what
you put over the stucco unless there was an air space.
BTW, how are you going to insulate the former exterior wall? Or do you live
where that isn't a big thing?
There is no doubt that your best bet would be to attach pressure treated
furring strips to the wall and put sheetrock on them. The existing
electrical outlets could be fixed with electrical box extenders. Going that
way, you would also be able to add sheet foam insulation complete with vapor
barrier at the expense of losing 2" or so of space.
The former exterior walls are now interior walls of the revised porch. The
new exterior walls are pretty much all windows except for about 2 feet under
them which will be insulated. The stucco walls are really not wet or subject
to any outside elements. I just did not know if the drying compound ir
setting compound could be used for the smoothing out operation successfully.
I will do the tape plastic test just to check, but I do not expect any
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