JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Pressure on Parapets Pressures on parapets for rigid or flexible structures are calculated as follows: Pp= qp(GCpn) (27.4-4) where Pp =combined net pressure on parapet qp =velocity pressure evaluated at top of parapet from (27.3-1) GCpn = { + 1.5 for windward parapet − 1.1 for leeward parapet Parent topic: ASCE 7-10