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Stone veneer calculator

160 SF of stone flats10 scratch bags · 7 setting bags
Stone flats
160 SF
WRB (2 layers)
2 rolls (306 SF net each)
Metal lath 27" × 97"
10 sheets (1 bundle of 10)
Lath nails or staples
206 nails or staples
Scratch coat (80 lb)
10 bags
Setting mortar (50 lb)
7 bags
Foundation screed
20' 0" · 2 pieces of 10'

These sketches are here to help you order material and price the work quickly. They are not engineered or shop drawings — always build from your approved project drawings.

Section through the wall. Layers drawn thicker than real so they can be read.

Wall
Size by

Mortar

Setting mortar (Omega MAVS 1000, 50 lb)

Scratch coat: QUIKRETE Veneer Stone Mortar, about 17 SF per 80 lb bag at 1/2". Setting: low end of Omega's published range. Joint grout isn't counted.

Water-resistive barrier (2 layers)

WRB roll

Two layers on framed walls (MVMA), lapped 2" across and 6" at the ends. Lath is fastened every 7" on studs no more than 16" o.c.

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  1. Wall to cover
    length × height
    20 × 8 (ft) = 160.00
  2. WRB rolls (2 layers)
    2 × SF ÷ SF per roll (roll less 2" and 6" laps), rounded up
    2 × 160 ÷ 306.22 = 2
  3. Lath sheets
    SF ÷ 17.67 SF per sheet, rounded up
    160 ÷ 17.67 = 10
  4. Lath nails or staples
    SF × (12 ÷ 16") × (12 ÷ 7"), rounded up
    160 × 0.75 × (12 ÷ 7) = 206
  5. Scratch coat bags
    SF ÷ (SF per bag at 1/2" × 1/2 ÷ thickness), rounded up
    160 ÷ (17 × 0.5 ÷ 0.5) = 10
  6. Setting mortar bags
    SF ÷ SF per bag, rounded up
    160 ÷ 25 = 7
  7. Foundation screed pieces
    base LF ÷ 10 ft, rounded up
    20 ÷ 10 = 2

Where the numbers come from

  • Code: Adhered veneer on stud walls follows the stucco WRB and lath rules (IRC R703.12 → R703.7.1, R703.7.3); units no thicker than 2-5/8", 36" on a face, 5 SF, 15 psf (TMS 402 12.3.2.1)2021 IRC (City of Seattle reprint) and TMS 402/602 as quoted in the Penn State PHRC handout. Clearances: 4" above earth, 2" above paving, 1/2" above a walking surface on the same foundation.Source
  • WRB: At least two layers on framed walls (MVMA); rolls lapped 2" across and 6" at the endsMVMA Installation Guide Table 1 and p.10. Corners lapped 16" past the corner both ways — not added. Henry Jumbo Tex 40" × 97.2' preset (306 SF net per roll).Source
  • Lath: 2.5 lb/SY self-furring (or 3.4 lb rib) per C847; 27" × 97" sheets = 17.67 SF net after 1/2" and 1" laps; wrapped 12" around corners; fastened every 7" on studs no more than 16" o.c.MVMA pp. 8–11; sheet size ClarkDietrich. The corner wrap is counted as corner LF × 2 SF of extra lath (12" on each side) — an allowance, not a layout.Source
  • Scratch coat: Type N or S mortar, nominal 1/2"; QUIKRETE Veneer Stone Mortar 80 lb ≈ 17 SF at 1/2" (0.71 ft³ ÷ 1/2" = 17.0)MVMA Table 1 and p.12. Over masonry or concrete the page leaves the scratch coat, lath and WRB off (lath not required on prepared masonry, IRC R703.7.1 Exception) — check the stone maker's instructions.Source
  • Setting mortar: Omega MAVS 1000, 50 lb: back-butter ("masonry method") 25–35 SF; 1/2" × 1/2" trowel 40–50; 1/4" × 3/8" 55–65; 1/4" × 1/4" 85–95The page uses the low end. MVMA: full back of each unit buttered, nominal 1/2"; scratch + setting bed about 1" total. Joint grout is not counted.Source
  • Foundation screed: 26 ga or plastic, 3-1/2" flange, 1" below the plate line; 10 ft piecesIRC R703.12.2; piece length ClarkDietrich. Left off masonry walls.Source
  • Stone: Flats bought by the SF of wall; corners by the LF of outside cornerThe flats SF is the full wall SF — corner pieces cover some wall too, and how much depends on the stone line, so nothing is taken off. Lay out 25 SF of units first to mix sizes and colors (MVMA p.12).Source

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Adhered manufactured stone on a framed wall (2 layers of WRB, lath, a 1/2" scratch coat, setting mortar) or straight on block or concrete.