• Studs 24" OC maximum spacing;
  • Flat vertical wall installations only;
  • HardiePlank should not be used as trim or fascia;
  • Grade should slope away from home 6" in 10' minimum;



  • 6" min. above grade;
  • 2" min. above flatwork and other hard surfaces;
  • 2" min. above deck planking. Z-flashing required at deck ledger should be installed so that vertical lip is behind


Joist hangers;

  • 1" min. above roof-covering material (2" after May 2016);
  • 1/4" clearance above horizontal (headwall) flashing, no caulking;
  • 1/8" minimum gap at butt joints (joint flashing preferred but not required) and where siding butts trim (caulking required);



  • Water-resistive barrier required w/proper penetration (windows, doors, vent terminations, etc.) flashing;
  • 1/4" starter strip should be installed at first (bottom) course;
  • 1 1/4" min. course overlap
  • Trim should not overlap siding. Siding should terminate at trim with 1/8" min. caulked gap.
  • (Dryer) Vent penetrations: Vents should be installed against a block installed against wall sheathing with head flashing installed and siding installed as if the block were trim;
  • Field-cut edges should be caulked, primed, or painted



  • Corrosion resistant nails required. SS recommended in coastal and humid climates;
  • No aluminum nails, staples, or clipped-head nails
  • 3/8" min. from vertical edges;
  • 3/4" min. from horizontal edges;

•  Nails should not be over-driven