Isolated and Combined Footing Takeoff
Foundations are a stack of quantities per footing. Build a spreadsheet row per footing mark and the totals fall out.
Per-footing quantities
| Item | Computation |
|---|---|
| Excavation | (L + working space) × (W + working space) × depth; add side slope if unshored |
| Lean concrete | (L + 100 mm) × (W + 100 mm) × 50–75 mm |
| Structural concrete | L × W × thickness + pedestal (h × a × b) |
| Bottom rebar mat | bars each way × (footing dim − 2 cover + hooks) × unit weight |
| Dowels | column bar count × (development into footing + projection + lap) × unit weight |
| Backfill | excavation − concrete below grade, × compaction factor |
Combined and strip footings
Combined footings (two or more columns on one pad) and strip footings under walls use the same line items — just longer plan dimensions and often a top mat as well as a bottom mat because the bending reverses between columns.
Waterproofing and protection
Where the water table is high, add a bituminous coating or membrane to buried faces, a protection board, and possibly a permanent dewatering allowance during construction.
Consolidate
Sum by footing mark → total excavation (m³), lean concrete (m³), structural concrete (m³ → cement/sand/gravel), rebar (kg by diameter), and backfill (m³ compacted). Spoil to remove = excavation − backfill, as loose volume.
EngEst Pro’s Structural and Civil calculators work together on foundations — enter footing dimensions and the platform returns excavation, lean and structural concrete, two-way rebar, dowels, and backfill as one consolidated BOM.
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