| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. FORMWORK MATERIAL & CONDITION (IS 14687:2017 Cl. 5) | |||
| A1 | Formwork material type documented — steel, plywood, timber, or modular system Acceptance: Material type recorded (e.g., 'MS steel shuttering', 'BWP plywood 12mm', 'timber frame with joists'); batch/lot number noted if modular system; material data sheet available; approval certificate from supplier present | IS 14687:2017 — Formwork material must be suitable for load and reuse conditions | |
| A2 | Material condition assessed — no cracking, corrosion, or structural damage Acceptance: Steel: no rust (light oxidation acceptable), no cracks/tears, edges not bent/sharp, load-bearing welds inspected for cracks, surface prepared and release agent applied; Plywood: no delamination, splinters, or missing pieces, surfaces intact, oiling applied | IS 14687:2017 Cl. 5.1 — Formwork material must be free from defects affecting strength | |
| A3 | Plywood thickness verified — minimum 12mm for typical spans Acceptance: Measure plywood thickness at 5 locations with caliper: minimum 12mm required (for moderate spans), 15mm for spans >1.5m, 18mm for cantilevers; thickness uniform ±0.5mm | IS 14687:2017 Cl. 5.2 — Plywood thickness depends on span and load (typically 12–18mm) | |
| A4 | Release agent (oiling/coating) applied uniformly — prevents concrete bond Acceptance: Oil applied to all internal surfaces (walls, soffits, edges) at time of installation, uniform coverage (no dry patches, no pooled oil), non-staining release agent if visible surface, reapplied if ≥3 days since application | IS 14687:2017 Cl. 5.3 — Release agent required to facilitate formwork removal | |
| A5 | Formwork reuse history noted — number of previous uses, condition impact assessed Acceptance: For reused formwork: number of previous pours documented (typically 5–10 uses acceptable for plywood, 50+ for steel), visual inspection for deformation/cracks, dimensions verified unchanged from first use | IS 14687:2017 Cl. 5.1 — Reused formwork must be inspected for fatigue/damage | |
| B. ALIGNMENT & DIMENSIONAL ACCURACY (IS 14687:2017 Cl. 6.1) | |||
| B1 | Plan dimensions checked — length, width, height against structural drawing Acceptance: Internal dimensions measured at 3 locations (top, mid, bottom if tall element) with steel tape/ruler: length ±5mm, width ±5mm, height ±5mm; all readings recorded on inspection sheet; cross-checked against latest drawing | IS 14687:2017 Cl. 6.1 — Formwork dimensions shall match design with tolerance ±5mm | |
| B2 | Verticality checked for columns/walls — plumb within ±3mm per 3m height Acceptance: Use spirit level or plumb bob: top-to-bottom deviation ≤3mm per 3m (for 6m height: ≤6mm total), measure at 2+ points along each face (column faces, wall faces), record maximum deviation | IS 14687:2017 Cl. 6.1 — Vertical elements must be plumb to specification | |
| B3 | Level checked for horizontal elements (slabs, beams) — ±5mm per 3m span Acceptance: Use laser level or dumpy level: maximum deviation ≤5mm across span (for 4m span: ≤5mm acceptable), measure at 4 corners and mid-span, slopes intentional per drawing marked and verified, record actual levels | IS 14687:2017 Cl. 6.1 — Horizontal surfaces must be level to specification | |
| B4 | Diagonal measurements checked for squareness — opposite diagonals equal ±10mm Acceptance: For rectangular elements: measure diagonal corner-to-corner, both diagonals should be equal ±10mm; for plan areas >100m²: measure at mid-points as well; record both diagonals | IS 14687:2017 Cl. 6.1 — Plan geometry ensures proper concrete geometry | |
| B5 | Formwork edges — measured at start & end of each straight run Acceptance: Long straight edges (>3m) checked with string line: deviation ≤5mm over span, measured at 1m intervals; curved edges per drawing tolerance; record any edge irregularities | IS 14687:2017 Cl. 6.1 — Edge straightness affects concrete profile | |
| C. JOINTS & SEALING (IS 14687:2017 Cl. 7) | |||
| C1 | All formwork joints sealed — visual inspection for gaps >1mm Acceptance: All joints between plywood sheets, timber members, or steel panels sealed with mortar or caulk, no visible gaps >1mm, sealant applied before concrete placement, water test: pour water on joint; no seepage acceptable | IS 14687:2017 Cl. 7.1 — Joints must be sealed to prevent concrete/grout loss | |
| C2 | Joint sealant material checked — mortar type / caulk type noted Acceptance: Mortar joints: 1:3 (cement:sand) or similar (non-adhesive), applied firmly, cured >24 hrs before pour; caulk: flexible type (not epoxy), applied in continuous bead, surface recessed slightly (not flush) | IS 14687:2017 Cl. 7.1 — Sealant must prevent fluid loss and not bond to concrete | |
| C3 | Construction joint preparation — surface roughened and dowel bars placed if specified Acceptance: Old surface (if existing) roughened (remove laitance using wire brush/chipping), dowel bar spacing and embedment verified per drawing (typically 16mm bars @ 300mm c/c), embedment depth correct (e.g., 300mm in old concrete, 300mm available for new) | IS 456:2000 Cl. 11.4 — Construction joints prepared to ensure bond with next pour | |
| C4 | Joint line straight and level — checked with string/laser before pouring Acceptance: Joint line marks visible on formwork, level with soffit/floor surface (no step), straight along direction (use string line), prepared edge clean and ready to receive concrete | IS 456:2000 Cl. 11.4 — Construction joint geometry affects concrete distribution | |