On Wednesday, December 30, 2015 at 1:34:17 PM UTC-5, Eagle wrote:
DerbyDad03 wrote on 12/30/2015 :
On Wednesday, December 30, 2015 at 1:00:49 PM UTC-5, Eagle wrote:
DerbyDad03 formulated the question :
On Wednesday, December 30, 2015 at 11:00:30 AM UTC-5, Eagle wrote:
FrozenNorth pretended :
On 2015-12-29 6:48 PM, Eagle wrote:
Oren wrote on 12/29/2015 :
On Tue, 29 Dec 2015 14:59:28 -0800, "Eagle"
wrote:

The question is about paint primers. Don't let facts interfere.

I don't believe in painting over primed plaster. After 30+ years as a
plasterer, I avoid priming plaster walls, both interior and exterior.
A bit of work and you avoid old paint lifting after priming.

Good for you. Primers do help and paint adheres and looked just
wonderful. I'd even prime a 90 year old pastier wall.
Would you save the plaster?

If it were savable, yes. You don't see original redwood lath and plaster
very often. If it's crumbly and falling off, no.
There are other types of plaster and I'm assuming it's hardwall plaster,
not thinwall plaster.

Try the crap in my house, renovations are a pain in the ass, it is a wire
mesh lath with the plaster over the top of that. Gloves and the right
tools are a key for the parts of it I have redone, otherwise expect
blood.

I worked in California, so there are no basements to speak of, and most
of the interior plaster walls are 2'X4' 1/2" wall board with metal mesh
used in inside corners and fiberglass tape on joints. Gypsum plaster is
spread over that lath and when cured and dry, "puttycoat" is spread
over the gypsum resulting in a very hard wall.

I have very similar walls in my 1956-era house in the northeast US. The
"2'X4' 1/2" wall board" that you mention is gypsum board, laid
perpendicular to the studs (i.e. horizontal).

The insides of the walls look similar to this, although my gypsum boards
are 6" (8"?) wide, not 2'. I'm not sure about the length. It's been a while
since I tore any walls down, so the exact width and length of the gypsum
board has been forgotten, but I'm confident that it is not 2', not even
1' wide.

http://inspectapedia.com/interiors/P...Board31DFs.jpg

My walls measure about 3/4" thick. The metal mesh in the corners and
at the ceiling junctions make certain types of repairs and/or renovations
a real PITA. Patches in the open field need to be shimmed out to become
flush with the rest of the wall/ceiling.

The pic shows the gypsum board lath with gypsum 'hardwall' squeezing
between the joints. That's normal. Did you tape measure the width and
length of the gyp board lath? The normal size is 2'X4'X 1/2" thick for
walls, and 3/4" thick for partition firewalls between the house and
garage, or in other areas where fire is a hazard.

I never put a tape to the gypsum board lath, but I have torn out a few walls.

I'm trying to think of a place where I can see the back of a wall, perhaps
in the plumbing access area for the shower. The wall that I might be able
to see will be the back of a bedroom wall, extending into the closet. I'll
take a look when I get home. I'm just about 100% sure that the lath is not
2' wide, but we'll see.

As far as I recall, all original walls, internal and ex, are 3/4" thick.


The building codes in
your area may vary. The other interior plastering method is called
'THINWALL' and is mixed wet and spread on 4'X8'X1/2" GREENBOARD lath.
It looks very much like regular driwall board, but the paper is green
instead of grey.

The paper on my lath board is more brown than grey, leaning towards the
brown color of paper grocery bags.

Fiberglass mesh 2" wide tape is either stapled to the
joints, or has a impregnated glue so there is no need for staples.
Some of the gyp board may be cut to size and that is why you see
smaller gyp board?

I don't think so, but I'll check tonight, if I can.

There is a driwall product that comes in a sac dry and you mix it with
water and hawk and trowel the material over the repair areas. You can
go up to 1" thick with this material, but you may get cracks after
drying and have to use topping compound to fill in the cracks. Yes, the
material mentioned has a 'set' time, so mix it and get it on the wall
before it sets up.
HTH

I may have a scrap of wall that I cut out and saved as a reminder. If I
can find it, I'll take a picture.

Great! I await your return!

I was mistaken. The gypsum board is indeed 2' wide.

It's the subfloors and roof sheathing that are 1 x 6" T&G boards. (no plywood)

I can't put my hands on the wall cutout that I (thought I) saved.