Finish TradesQuestion 418 of 700
In three-coat interior plaster over metal lath, what is the correct order of the coats from the lath outward?
a.Scratch coat, brown coat, finish coat
b.Finish coat, brown coat, scratch coat
c.Brown coat, scratch coat, finish coat
d.Finish coat, scratch coat, brown coat
Explanation
Three-coat plaster is applied as the scratch coat (keyed into the lath and scored), then the leveling brown coat, then the thin finish coat. The other sequences reverse or scramble the layers, which would defeat the mechanical key and the leveling and finishing functions of each coat.
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