Acceptable Substrates:
• Exterior grade gypsum sheathing meeting ASTM C 1396 (formerly C 79) requirements for water resistant core or Type X core
at the time of application
• Exterior sheathing having a water-resistant core with fiberglass mat facers meeting ASTM C 1177
• Exterior fiber reinforced cement or calcium silicate boards
• APA Exterior or Exposure 1 Rated Plywood, Grade C-D or better, nominal 1/2 in (12.7 mm), minimum, installed with the C
face out
• APA Exterior or Exposure 1 Fire Retardant Treated Plywood, Grade C-D or better, nominal 1/2 in (12.7 mm), minimum,
installed with the C face out
• APA Exposure 1 Rated Oriented Strand Board (OSB) nominal 1/2 in (12.7 mm), minimum
• Unpainted, unsealed concrete and CMU
• Galvanized metal and aluminum
If you need help with your order or consult our design experts for advice, do not hesitate to contact us. We're happy to help!