Three-coat stucco wall assembly — sheathing, WRB, lath, scratch, brown, finish (7/8″)
Three-coat stucco over framing is a 7/8″ system: two layers of WRB, then metal lath (cups out so the plaster keys behind it), then a 3/8″ scratch coat, 3/8″ brown coat, and 1/8″ finish coat.
What this diagram shows
A cross-section of a three-coat portland-cement stucco wall over wood framing, with the layers from inside to outside: framing and sheathing, two layers of weather-resistive barrier (Grade D paper), galvanized metal lath whose cups face out so the plaster keys behind it, a 3/8-inch scratch coat that is scored, a 3/8-inch brown coat leveled true, and a 1/8-inch finish coat — about 7/8 inch total. Masonry and concrete systems are thinner and need no lath.
Stucco Calculator
3-coat / 2-coat / 1-coat stucco take-off — bags per coat, lath, weep screed, casing, control joints. Per IRC R703.7 / ASTM C926. Free.
Related diagrams
Masonry, Stucco & HardscapeBrick bond patterns compared — running, ⅓ running, stack, common, English, and Flemish
Masonry, Stucco & HardscapeWhere bricks-per-square-foot comes from — the nominal brick-plus-joint cell
Masonry, Stucco & HardscapeAnchored brick-veneer wall section — air space, WRB, ties, flashing, and weep holes
Masonry, Stucco & HardscapeWhat goes under pavers — compacted base, bedding sand, joint sand, and edge restraint
Masonry, Stucco & HardscapePaver laying patterns — running bond, herringbone, basketweave, and waste factors
Masonry, Stucco & HardscapeWhy pavers need edge restraint — the perimeter creeps and unravels without it