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Both Wind Loads (ASCE 7-16) and Wind Loads (ASCE 7-22) support optional parapet calculations for MWFRS and Components and Cladding (C&C).
Create a wind load sheet:

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When parapet inputs appear

Include Parapets? is available when Type of Calculation is:
  • MWFRS (Envelope Procedure)
  • MWFRS (Directional Procedure)
  • Components and Cladding, but only when Individual Effective Area per Wind Zone is set to No
If C&C uses per-zone effective areas (Individual Effective Area per Wind Zone = Yes), parapet inputs are hidden.

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Inputs

In the Parapets section, set Include Parapets? to Yes (default is No).
  • Parapet Height Above Roof (hparapeth_{parapet}): height from mean roof level to the top of the parapet. The calculator uses this elevation to evaluate velocity pressure at the top of the parapet.
Parapet Height Above Roof input showing description, code references, and validation checks Detailed intermediate steps appear under Parapets (ASCE 7-16, Cl. 27.3.4, Cl. 28.3.2, Cl. 30.6.1.2) or Parapets (ASCE 7-22, Cl. 27.3.4, Cl. 28.3.4, Cl. 30.6), depending on the calculator version.

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MWFRS parapet pressures

When parapets are enabled for MWFRS, the summary shows Parapet Wind Pressures with combined net pressures for windward and leeward faces.
FaceCombined net pressure coefficient (GCpnGC_{pn})
Windward parapet+1.5
Leeward parapet−1.0
Code references:
  • ASCE 7-16: Cl. 27.3.4 (Directional), Cl. 28.3.2 (Envelope)
  • ASCE 7-22: Cl. 27.3.4 (Directional), Cl. 28.3.4 (Envelope)
Plus sign means net pressure toward the exterior; minus sign means suction away from the exterior.

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C&C parapet pressures

When parapets are enabled for C&C (with Individual Effective Area per Wind Zone = No), the calculator outputs:
  • Parapets Wind Pressures for Load Case A
  • Parapets Wind Pressures for Load Case B
Load Case A reports:
  • Windward parapet: Zones 4 and 5
  • Leeward parapet: Zones 2 and 3
Load Case B reports:
  • Windward parapet: Zones 4 and 5
  • Leeward parapet: Zones 4 and 5
Parapets Wind Pressures for Load Case A and Load Case B summary tables Code references:
  • ASCE 7-16: Cl. 30.6.1.2
  • ASCE 7-22: Cl. 30.6, Eq. 30.6-1
C&C parapet height limitFor Components and Cladding, parapet height must be less than 3 ft when the roof angle is 7 degrees or less. If you exceed this limit, the calculator shows a message directing you to contact support.