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Flashcards in Lath and Plaster Deck (23)
1

plaster:
materials

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

2

plaster application:

over base material in 2 or 3 coats.

3

plaster vs stucco

plaster = interior

stucco = exterior

4

plaster types:
vermiculite or perlite used for

lightweight, fire-resistant.

5

plaster types:
Keene’s cement

high resistant to abrasion and water penetration.

6

Stucco:
materials

portland cement, lime, sand and water.

7

stucco pros:

hard, non-water-absorbent.

8

portland cement: use

used as a backing for tile walls,
and the scratch and brown coats under Keene’s cement.

9

plaster application:

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

10

scratch coat:

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

11

brown coat:

¼”, layer 2.

12

finish coat:

⅛”, layer 3.

13

two coat plaster work combines

scratch and brown.

14

type of metal lath:
general purpose flat/curved surfaces.

expanded diamond mesh

15

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

paper-backed diamond mesh

16

type of metal lath:
typ used for base for portland cement plaster under ceramic tile.

paper-backed diamond mesh

17

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

flat-rib lath:

18

gypsum lath:
advantage

reduces labor bc only 1 coat needed

19

16x48” boards applied horizontally to studs,
or comes in 48x96” sheets.

gypsum lath

20

plaster and lath edges:
for outside corners

corner beads

21

plaster and lath edges:
to trim doors, windows

casing beads

22

stucco req's expansion joints every

10 ft

23

veneer plaster walls fire rating

1-2hrs