Module 2 of 10
Quantity Takeoff: Substructure
Measure everything below plinth level — earthwork, PCC, footings, plinth masonry and the protective layers (backfilling, soling, anti-termite treatment and DPC) — using IS 1200 measurement rules and site-tested methods.
After this module you can
You can produce a complete, defensible substructure quantity sheet from a foundation plan: excavation, PCC, footing concrete or masonry, plinth work, backfilling, soling, anti-termite treatment and DPC, each with the correct unit and measurement basis.
- 2.1 Centre Line Method vs Long Wall–Short WallBoth methods give the same answer when applied correctly — and different answers when junctions are handled sloppily. Learn the rules with one building solved both ways.8 min read
- 2.2 Earthwork and Excavation Quantities (With Working Space)The volume you dig and the volume you get paid for are two different numbers. Learn the IS 1200 measurement rules — and see a pit where the actual dig is 2.8 times the paid quantity.9 min read
- 2.3 PCC and Footing Concrete TakeoffPCC offsets, stepped footings and the frustum formula — the three places footing concrete takeoffs go wrong, solved with a 12-column worked example.8 min read
- 2.4 Plinth Masonry, Backfilling and SolingThe most double-billed item in residential construction is soil going back into the ground. Learn to derive backfill and plinth fill by arithmetic — and catch the classic traps.7 min read
- 2.5 Anti-Termite Treatment and DPC QuantitiesTwo cheap layers stand between your building and its two most patient enemies — termites and rising damp. Learn to compute the litres and square metres, and to audit the quotes.7 min read
- 2.6 Worked Example: Full Substructure Takeoff of a 2BHKOne 2BHK, one centre-line statement, every substructure quantity from excavation to DPC — ending in the summary sheet this module promised you could produce.8 min read