Lath and Plaster

Question 1

plaster:

materials

Answer 1

gypsum and lime, aggregates of sand, vermiculite or perlite, and water.

Question 2

plaster application:

Answer 2

over base material in 2 or 3 coats.

Question 3

plaster vs stucco

Answer 3

plaster = interior

stucco = exterior

Question 4

plaster types:

vermiculite or perlite used for

Answer 4

lightweight, fire-resistant.

Question 5

plaster types:

Keene’s cement

Answer 5

high resistant to abrasion and water penetration.

Question 6

Stucco:

materials

Answer 6

portland cement, lime, sand and water.

Question 7

stucco pros:

Answer 7

hard, non-water-absorbent.

Question 8

portland cement: use

Answer 8

used as a backing for tile walls,

and the scratch and brown coats under Keene’s cement.

Question 9

plaster application:

Answer 9

metal lath attached to metal or wood studs.
scratch coat:
brown coat:
finish coat:

Question 10

scratch coat:

Answer 10

¼”, first coat over lath, flows around and behind open mesh.

Question 11

brown coat:

Answer 11

¼”, layer 2.

Question 12

finish coat:

Answer 12

⅛”, layer 3.

Question 13

two coat plaster work combines

Answer 13

scratch and brown.

Question 14

type of metal lath:

general purpose flat/curved surfaces.

Answer 14

expanded diamond mesh

Question 15

type of metal lath:
asphalt-impregnated paper,
base for portland cement plaster under ceramic tile.

Answer 15

paper-backed diamond mesh

Question 16

type of metal lath:

typ used for base for portland cement plaster under ceramic tile.

Answer 16

paper-backed diamond mesh

Question 17

type of metal lath:
more rigid bc one-way, V-shaped ribs 4” o.c.
use: ceilings and solid partitions

Answer 17

flat-rib lath:

Question 18

gypsum lath:

advantage

Answer 18

reduces labor bc only 1 coat needed

Question 19

16x48” boards applied horizontally to studs,

or comes in 48x96” sheets.

Answer 19

gypsum lath

Question 20

plaster and lath edges:

for outside corners

Answer 20

corner beads

Question 21

plaster and lath edges:

to trim doors, windows

Answer 21

casing beads

Question 22

stucco req’s expansion joints every

Answer 22

10 ft

Question 23

veneer plaster walls fire rating

Answer 23

1-2hrs