The roof is approved as a system — deck, underlayment, attachment and covering — and the underlayment carries its own approval.
AppearanceFlat and low-slope roofs disappear behind a parapet, which is why the parapet edge and drip become the visible detail.
DurabilityAttachment and flashing govern. Most roof failures start at an edge, a penetration or a termination, not in the field.
MaintenanceClear drains and scuppers, inspect terminations and penetrations after major storms, keep the approval and warranty together.
SuitabilityLow-slope membrane suits the flat-roofed modern form; tile and metal suit pitched roofs and carry different uplift behaviour.
Cost influenceDriven by system type, insulation, the number of penetrations and the length of edge and flashing detail.
South FloridaUplift at corners and edges is far higher than in the field, so fastening patterns tighten at the perimeter — that zoning is part of the approval, not an installer preference.
Common useLow-slope membrane behind parapets on contemporary houses.
Approval neededSystem approval covering deck type, underlayment, attachment method and covering, matched to the roof slope drawn.