| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. FORMWORK & SHUTTERING (IS 456 Cl. 11) | |||
| A1 | Formwork surface cleaned and free from loose material Acceptance: Surface clean, no cement residue, dirt, or foreign matter visible | Cl. 11.1 — Formwork must be clean, properly oiled and maintained | OK NC NA HOLD |
| A2 | Release agent (oil/compound) applied uniformly Acceptance: Uniform oiling, no pooled oil or dry spots, non-staining release agent if specified | Cl. 11.1 — Formwork shall be oiled before concrete placement | OK NC NA HOLD |
| A3 | Internal dimensions verified against drawing — length, width, depth Acceptance: All dimensions within ±5mm of drawing; measured at 3 locations minimum (top/mid/bottom) | Cl. 11.2 — Formwork dimensions shall conform to design with tolerance ±5mm | OK NC NA HOLD |
| A4 | Verticality of walls / columns checked — plumb checked Acceptance: Verticality within ±3mm per 3m height (use spirit level or plumb bob); no tilt or lean | Cl. 11.2 — Formwork shall be plumb and rigid | OK NC NA HOLD |
| A5 | Level checked for slabs / horizontal elements Acceptance: Level within ±5mm per 3m span (use laser level or dumpy level); check at 4 corners and mid-span | Cl. 11.2 — Horizontal formwork shall be level within tolerance | OK NC NA HOLD |
| A6 | Props/supports installed at designed spacing — vertical spacing recorded Acceptance: Prop spacing not exceeding design spacing (typically 1.0–1.5m for slabs); secured at base and top, locked with pins/bolts | Cl. 11.3 — Props shall be properly installed and spaced per design | OK NC NA HOLD |
| A7 | Diagonal bracing installed for lateral stability Acceptance: Diagonal bracing present at 45° angle, secured at both ends, no slack or gaps; bracing members not damaged | Cl. 11.3 — Cross-bracing and diagonal bracing required for rigidity | OK NC NA HOLD |
| A8 | Prop base secured on solid ground — no settlement risk Acceptance: Base plates on firm soil/hardened concrete, no mud/water underneath, shimming level if needed, load distribution adequate | Cl. 11.3 — Prop bases shall be set on firm, level ground | OK NC NA HOLD |
| A9 | Formwork joints sealed to prevent loss of concrete/grout Acceptance: All joints sealed with caulk or mortar, gaps ≤1mm; test by pouring water — no seepage | Cl. 11.1 — Formwork joints must be sealed to prevent grout loss | OK NC NA HOLD |
| A10 | Construction joint location and preparation correct — dowel bars in place if required Acceptance: Joint line level with formwork, no step or gap; dowel bar placement verified (if specified), spacing and embedment per drawing (typically 16mm bars @ 300mm c/c) | Cl. 11.4 — Construction joints shall be formed and prepared as per drawing | OK NC NA HOLD |
| A11 | Camber provided for slabs if specified in drawings Acceptance: Camber (if required) measured and matches design value ±5mm; typically L/300 to L/500 depending on span | Cl. 11.2 — Formwork camber as per design to allow for deflection | OK NC NA HOLD |
| A12 | Embedment items (conduits, sleeves, etc.) securely fixed in position Acceptance: All conduits/sleeves firmly held in correct position, no movement under light hand pressure, bracing/supports adequate | Cl. 11.5 — Embedded items shall be securely fixed to prevent displacement | OK NC NA HOLD |
| A13 | Formwork tie spacing verified — spacing according to design (typically 0.5–1.0m) Acceptance: Tie spacing uniform and not exceeding design spacing; all ties tight and secure, removal slots prepared if required | Cl. 11.3 — Formwork ties shall be spaced per structural design and concrete pressure | OK NC NA HOLD |
| A14 | Plywood/sheathing thickness adequate and undamaged Acceptance: Plywood minimum 12mm thickness (for typical applications), no cracks/delamination, edges supported and not deflecting under load | Cl. 11.1 — Formwork material thickness shall be sufficient to withstand concrete pressure | OK NC NA HOLD |
| A15 | Formwork deflection — measure and verify within tolerance Acceptance: Formwork deflection ≤ span/300 (for slabs typically <5mm for 1.5m span) measured with dial gauge or laser | Cl. 11.3 — Formwork shall be rigid and not deflect excessively under load | OK NC NA HOLD |
| B. REINFORCEMENT (IS 456 Cl. 5.6, 12, 26; IS 1786) | |||
| B1 | Bar diameter and grade verified against BBS — MTC checked Acceptance: MTC present and valid, grade Fe 500/500D confirmed, diameter matches BBS ±2%, tensile strength ≥545 MPa, elongation ≥16%, re-bar condition free from mill scale (≤5% loose scale acceptable) | Cl. 5.6 — All reinforcement shall have MTC certifying grade and properties as per IS 1786 | OK NC NA HOLD |
| B2 | Bar spacing — bottom layer checked against drawing and code minimum Acceptance: Clear spacing ≥75mm for beams (or 1.5× max aggregate size if larger), ≥50mm for slabs; spacing measured at 3 locations minimum; no bunching | Cl. 26.3.3 — Minimum clear spacing between bars shall be max(dia, 1.5×agg size, 75mm) | OK NC NA HOLD |
| B3 | Concrete cover — measured at 5 locations and within specified limits Acceptance: Cover to main bars: slab 20±5mm, beam 25±5mm, column 40±5mm (for moderate exposure); no cover <15mm at any point; cover blocks of correct size placed at 1m spacing | Cl. 26.4.1, 26.4.2 — Minimum cover for moderate exposure: slab 20mm, beam 25mm, column 40mm; for severe exposure add 10mm | OK NC NA HOLD |
| B4 | Lap splice location — verified if laps exist in element Acceptance: If laps present: positioned in low-stress region (mid-span for slabs, away from supports for beams), staggered so <50% bars lapped at one section, lap length calculated per clause | Cl. 26.2.5 — Laps shall be staggered and not located at point of maximum stress | OK NC NA HOLD |
| B5 | Development length / lap length for Fe 500 calculated and implemented Acceptance: For 20mm Fe 500 in M25: Ld ≈ 940mm, lap ≈ 1220mm; lap length verified on site against calculations; not less than 30 bar diameters minimum | Cl. 26.2.5 — Ld = 47d for Fe 500 in M25 concrete (tension); lap = 1.3×Ld for full capacity | OK NC NA HOLD |
| B6 | Top reinforcement (negative moment bars) — position and length verified Acceptance: Top bars at correct height (chair bars supporting them), extension into support verified from drawing (typically 0.25L or per design), straight or bent as required, no sagging | Cl. 26.2.3, 26.2.4 — Top bars shall extend into support per design | OK NC NA HOLD |
| B7 | Stirrup hooks — 135° bends with 10d minimum extension verified Acceptance: Hook angle 135° (standard), extension ≥10× stirrup diameter (for 10mm: ≥100mm), bend smooth with no cracking, hook length consistent throughout beam | Cl. 26.2.2 — Stirrup hooks shall be 135° with 10d extension or 180° with 4d extension | OK NC NA HOLD |
| B8 | Stirrup spacing verified against design drawing Acceptance: Spacing at support ≤0.75d (for 450mm deep beam: ≤337mm), spacing at mid-span per design, all stirrups equally spaced, no gaps >10mm | Cl. 26.5.1.5 — Stirrup spacing shall not exceed 0.75d or 300mm, whichever is less | OK NC NA HOLD |
| B9 | Bar straightness — no kinks or deformations affecting placement Acceptance: Bars free from kinks, dents, or straightening damage; straightness visually acceptable, no stress concentration points; bars placed as per BBS | Cl. 12.2 — Bars shall be straight or bent as per BBS, no deformation during transport/handling | OK NC NA HOLD |
| B10 | Chair bars installed to support top reinforcement layer Acceptance: Chair bars (typically 10-12mm dia) spaced at 1m grid, height correct to maintain top bar cover (e.g., 50mm for slab), securely tied to bottom bars, no sliding possible | Cl. 12.4 — Support blocks/chairs required for top bars to maintain cover and position | OK NC NA HOLD |
| B11 | Cover blocks installed and secured — spacing 1m maximum Acceptance: Cover blocks of correct height (e.g., 25mm for beams), spaced at ≤1m intervals, tied or fixed to prevent displacement, mortar type blocks only (no plastic in structural concrete) | Cl. 26.4 — Cover blocks shall maintain concrete cover throughout pour | OK NC NA HOLD |
| B12 | Reinforcement cleanliness — free from dust, rust scale, concrete coating Acceptance: Loose rust/mill scale <5% of surface area, no grease/oil present (visual check), light rust staining acceptable, remove debris by wire brushing if needed | Cl. 12.1 — Reinforcement shall be free from loose rust scale, grease, and oil | OK NC NA HOLD |
| B13 | Reinforcement alignment verified — no displacement during formwork completion Acceptance: Bars tied or fixed at intersections, no sagging >20mm, all bars hold true position under worker traffic (light hand pressure test), no kinks introduced by ties | Cl. 12.3 — Bars shall be securely fixed and not displaced during construction | OK NC NA HOLD |
| B14 | Bending bar codes verified if cranked or bent bars used Acceptance: Cranked bars at specified height (e.g., 0.15L or 0.20L from support), bend angle per drawing (typically 45°), straight portions on either side of bend, no kinking at bend | Cl. 12.1 — Bent bars shall be formed per BBS design at 45° or per drawing | OK NC NA HOLD |
| B15 | Starter/dowel bars from previous pour checked and correctly positioned Acceptance: Starter bars clean (loose rust removed), spacing matches new reinforcement grid, verticality ±5mm per meter height, embedment length adequate (typically ≥Ld/2 from previous pour) | Cl. 12.5 — Starter bars from previous element shall be correctly aligned and spaced | OK NC NA HOLD |
| C. EMBEDDED ITEMS & BLOCK-OUTS | |||
| C1 | Electrical conduits positioned and secured — diameter and location per drawing Acceptance: Conduit type and diameter per design (typically PVC ≤20mm for non-load-bearing), secured against formwork with clips/ties, spacing >150mm from edges, secured against floating during pour | Embedded items shall not compromise structural integrity | OK NC NA HOLD |
| C2 | Plumbing sleeves / ducts positioned — not crossing main reinforcement if avoidable Acceptance: Sleeves fixed in position (braced), internal diameter and material per design, location matches drawing ±20mm, no sleeve deflection during formwork activity | Embedded items shall be fixed to prevent displacement | OK NC NA HOLD |
| C3 | Anchor bolts / foundation bolts placed and held at correct height Acceptance: Bolts at correct height (elevation noted), centered in formwork ±10mm, secured to prevent rotation/displacement, templates or guides used if many bolts | Anchor bolts shall be set at correct elevation and not displaced during pour | OK NC NA HOLD |
| C4 | Dowel bars at construction joint — correct spacing and embedment Acceptance: Dowels (typically 16-20mm) spaced at 300mm c/c, embedment in previous pour ≥Ld/2, embedment in new pour ≥Ld/2, alignment within ±5mm of vertical | Dowels shall be placed at construction joints to transfer shear | OK NC NA HOLD |
| C5 | Block-outs / box-outs for future connections secured in place Acceptance: Block-outs secured to formwork or reinforcement, dimensions per drawing ±10mm, location verified from drawing, bracing adequate for vibration | Block-outs shall not be displaced during concrete placement | OK NC NA HOLD |