Measure the perimeter system
Use actual footing width and thickness plus wall thickness and height.
Separate stepped walls and grade changes into measurable segments.
Count interior supports
Piers, pads, beams, and isolated footings need their own quantities.
Do not distribute them into a generic perimeter allowance.
Measure ground coverage
Ground vapor-retarder quantity starts with crawl-space floor area and then accounts for seams and perimeter detailing.
Use the specified material and installation requirements.
Keep excavation distinct
Excavation geometry depends on access, trenching, working room, and site grade, not just finished concrete dimensions.
Plan spoil and haul-off separately when needed.
Verify foundation design
Support spacing, bearing, drainage, moisture control, frost protection, and ventilation or conditioning are project-specific.
Use approved plans and applicable requirements.