Deck irregularity is defined as being out of plane more than 1/8” in 10’-0” & ¼” in 20’-0”

1. Longitudinally (eave to ridge)
2. Latitudinally (gable to gable)
3. Or Both

Other Irregularity Factors

• Underlayments
  • Aged material
  • Improper attachment method used

Corrective Action Techniques

• Ultimately the contractor has the responsibility to go back to the building owner with the irregularities on the particular project prior to installation of panels
• Inspect the deck for deflection and undulation
• Properly install the correct underlayment
• Utilize Above Sheathing Ventilation shim or Glass and Glazing shim where necessary
• Choose a high quality factory manufactured panel
• Use proper clip/fastener placement
• Use proper tools for attachment, don’t overdrive fasteners