OCS Details

Window Head – OCS

 

Abutment Detail

 

Corner Details – OCS

 

Typical Hard Coat Stucco Lath Types

  1. Self-furring galvanized diamond lath:
    1. 5 or 3.4 pounds per square yard
    2. ASTM A847
  2. Wire Fabric
    1. Galvanized self-furring woven wire lath 17 gauge
      1. 1 ½ inch openings
      2. ASTM1032
    2. Galvanized self-furring welded wire lath, 16-gauge wire with openings not more than 2” by 2”
    3. ASTM – 847

 

Basic Lath Installation rules over wood framing:

  1. Long dimension of sheets or rolls shall be installed horizontally (perpendicular to framing).
  2. Apply lath taut and bend lath around corners.
  3. Lap splices in lath a minimum of 2 inches (varies).
  4. Lath should fully cover accessory flange.
  5. Use appropriate corrosion resistant fasteners with plates as appropriate with a target density of 1 per square foot.
  6. Penetrate wood framing a minimum of ¾” to 1”; typically, at 6 or 7 inches on center (check with local code).
  7. Recommend fastener engage at least three strands of lath.

 

Traditional or Hard Coat Stucco: scratch, brown and base coat considerations.

  1. Mix per manufacturer’s specifications.
  2. Do not use frozen materials.
  3. Do not apply to frozen or frost covered surfaces.
  4. Wall surfaces must be clean.
  5. Do not apply in direct sunlight on hot days.
  6. Maintain wall surface above 35 degrees F for 24 hours following applications.
  7. Moist or fog cure for 2 to 3 days; depending on weather.
  8. Allow walls to cure prior to applying finish.

 

Finish Coat installation considerations.

  1. Mix and apply finish coat per manufacturers’ specifications.
  2. Do not use frozen materials.
  3. Do not apply to frozen or frost covered surfaces.
  4. Wall surfaces must be clean d cured.
  5. Do not apply in direct sunlight on hot days.
  6. Maintain wall surface above 40 degrees F for 24 hours following applications.
  7. Install sealant per Manufacturer’s installation instructions.

 

Hard Coat Stucco References:

  • ASTM
    • C1063 Standard Specification for Lathing
    • C926 Specification for Application of Portland cement-based Plaster
    • C933 Specification for Welded Wire Lath
  • Portland Cement Association Plaster/Stucco Manual EB049
  • American Concrete Institute Guide to Portland Cement Plastering ACI 52R-93
  • NWCB Stucco Resource Guide (www.nwcb.org)
  • Texas Lathing & Plastering Cont. Assoc. (www.tlpca.org)
  • Minnesota Lath & Plastering Bureau (mnlath-plaster.com)
  • National Concrete Masonry Assoc. (www.ncma.org)