IS 3696 Part 1 : 1987Safety rules for scaffolds: Part 1 General requirements

IS 3696 (Part 1) specifies safety rules for scaffolds — general requirements. It is the default framework for any scaffold erected on a construction site for access, working platform, or material handling: tubular steel scaffolds, system scaffolds (cuplock, kwikstage), bamboo scaffolds, suspended scaffolds, and mobile tower scaffolds.

Use IS 3696 Part 1 whenever: - Erecting any temporary work platform > 1.5 m above ground (the height threshold for fall-protection) - Specifying scaffold provision in BOQ for facade work, plastering, painting, formwork, MEP installation - Auditing site safety compliance (DGFASLI, ESIC, project safety officer reviews) - Insurance assessment for high-rise construction projects - Tendering for scaffold-supply-and-erection contracts

IS 3696 has two Parts: - Part 1: General safety (this code) — scope, materials, design, erection, inspection, dismantling - Part 2: Ladders — specifically for ladders used as access

For structural design loads on scaffolds: pair with IS 875 Part 2 (live loads), IS 875 Part 3 (wind loads), and IS 4014 (steel tubes).

Recent context (2024+): Bureau of Indian Standards has begun updating scaffold codes to align with international BS EN 12810 / 12811 system scaffolds; IS 3696 is being supplemented (not replaced) by IS 16800 series for system scaffolds. For now, IS 3696 remains the legal baseline for general scaffold safety in India.

1. Tubular steel scaffolds (the default for medium-rise): - Galvanised mild steel tubes (typically 48.3 mm OD, 4.0 mm wall) per IS 1161 or IS 4014 - Couplers (right-angle, swivel, joint) per IS 2750 - Wooden / metal planks for working surface, toe-board, hand-rails - Erected by trained scaffolders, max one-storey-at-a-time during erection

2. System scaffolds (cuplock, kwikstage, ringlock): - Modular: vertical standards have lock-on points at fixed intervals (typically 0.5 m); horizontal ledgers click into place - Faster erection, more uniform load distribution - Increasingly the standard for medium-to-large projects

3. Bamboo scaffolds (still common in low-rise / informal sector): - Bamboo poles (Dendrocalamus or similar species) lashed with bamboo strips or rope - Permitted for buildings up to ~15 m height under IS 3696 Part 1 conditions: experienced scaffolder, regular inspection, local lashing practice - Increasingly being replaced by tubular / system scaffolds in formal sector due to safety concerns

4. Suspended scaffolds (cradles for facade work): - Platform suspended from rooftop outriggers by wire ropes + powered hoists - Used for facade glazing, painting, cleaning of high-rise - Most heavily regulated category — secondary safety lines, load testing, certified operator

5. Mobile tower scaffolds: - Free-standing tower with castor wheels, used for indoor work - Height-to-base ratio limit: 3:1 (outdoor) / 4:1 (indoor) - Wheel-locking mandatory before any worker climbs

Working platform requirements (Clause 4.5): - Minimum width: 600 mm for general work; 900 mm if materials are stored on platform - Maximum gap between planks and structure: 300 mm (else fall hazard from edge) - Toe-board height: 150 mm minimum (kicks rolling material off platform) - Guard rail height: 900-1100 mm (top rail), with intermediate rail at half-height - Plank thickness: ≥ 38 mm wood (or equivalent steel/aluminium); span between bearers ≤ 2 m for 38 mm plank, ≤ 2.5 m for 50 mm

Loading classes (Clause 5.2):

| Class | Distributed load | Point load | Use | |---|---|---|---| | Light duty | 1.5 kN/m² | 1.0 kN | Inspection, light maintenance | | Medium duty | 2.0 kN/m² | 1.5 kN | General building work — plastering, painting, brickwork | | Heavy duty | 3.0 kN/m² | 2.0 kN | Material storage, masonry, formwork support | | Special duty | as designed | as designed | Concrete pour, falsework — must be designed by structural engineer |

Tube spacing (typical tubular scaffold for medium duty): - Vertical standards: 1.5-2.0 m spacing along length, 1.2-1.5 m perpendicular to wall - Horizontal ledgers: 1.2-2.0 m vertical spacing - Bracing: every 5 bays in plan, every 4 m vertically - Ties to building: every 4 m vertically AND 4-6 m horizontally; use vertical tie pattern in lower 2 levels (vital against pull-out)

Wind speed limits for working from scaffold: - > 7-8 m/s (gust): suspend high-elevation work - > 14 m/s: full evacuation - Cyclonic warning: dismantle exposed sections, secure with extra ties

Inspection cadence (Clause 7): - Before first use after erection — by competent scaffolder + project safety officer - After any modification, alteration, or after extreme weather - Weekly routine inspection during use - Tag system: green (safe), yellow (modify), red (do not use)

• IS 3696 Part 2 — ladders (specifically for ladders used as scaffold access).
• IS 1161:2014 — steel tubes for structural purposes (the tube material specification).
• IS 2750:1964 — steel scaffold couplers.
• IS 4014 Part 1:1967 — code of practice for steel tubular scaffolding (older counterpart, still cited).
• IS 875 Part 2:1987 — imposed (live) loads.
• IS 875 Part 3:2015 — wind loads (critical for tall scaffolds and during cyclones).
• IS 7155 (multi-part) — codes of recommended practice for handling, storing, conveying materials.
• IS 14687:1999 — guidelines for scaffolding and falsework.
• IS 16800 (newer) — modular system scaffolds (cuplock, kwikstage, ringlock).
• BIS 'Construction Safety' series — Bureau publications for site safety practices.
• Building and Other Construction Workers (BOCW) Act, 1996 — statutory framework that references IS 3696 for fall protection.
• Factories Act 1948 + State Rules — site safety, fall arrest mandatory above specific height
• IS 9473 — body harness for fall arrest (PPE companion).

1. No design for scaffolds > 25 m or for irregular configurations. IS 3696 standard configurations cover up to ~25 m height for medium-duty tubular. Above this, a designed scaffold by a competent engineer is mandatory — not a 'best guess by senior scaffolder'. 2. Ties to building omitted or too few. Most scaffold collapses are from inadequate tying. Expect one tie per 16 m² of scaffold face at minimum. Verify by site inspection — counts, anchor type (cast-in plate / drilled-in expansion), torque check. 3. Mixed manufacturer couplers / used-grade tubes. Cheap mixing increases coupler-slip risk. Specify single-source or single-IS-code tubes and couplers. 4. Working platform without toe-boards or guard-rails on inner face. Inner side (facing wall) often left open during plastering. Workers fall through this gap most frequently. 5. Load class not declared and not enforced. Marker board at base of scaffold should state load class. Site supervisor should refuse material storage on light-duty scaffolds. 6. No fall arrest above 1.8 m even when scaffold meets IS 3696 — full-body harness with double lanyard remains the minimum site PPE for working at height. 7. Bamboo scaffolds without competent lashing supervision. Bamboo scaffolds work, but only with skilled traditional lashers. New crews often miss the diagonal bracing pattern that holds the structure under load. 8. Ladder access via a single ladder for tall scaffolds. IS 3696 Part 2 limits single-ladder rise; tall scaffolds need staircase towers (every 8 m, separate from work platforms) and intermediate landings. 9. No weather contingency plan. Rain reduces friction on plywood platforms (slip hazard); high wind risks scaffold sway; cyclones can collapse. Site safety plan must cover. 10. Dismantling without full PPE. Statistically, dismantling has higher injury rate than erection (less attention, complacency at end of job). Maintain inspection and tagging through dismantling.

Scaffold lifecycle on a typical project:

1. Tender stage: scaffold provision included in BOQ, scope clarified (height, duration, load class), contractor required to be IS 3696 compliant. 2. Pre-mobilisation: contractor submits scaffold drawings (for designs > 25 m or complex), competent person nomination, materials list (tubes, couplers — IS-marked). 3. Erection: by trained scaffolders; tagging system implemented from day 1. 4. First-use inspection: jointly by scaffold contractor's safety officer + project safety officer. Tag: green if pass. 5. Routine inspection: weekly during use; after any storm or modification; logged in Form A (safety inspection register). 6. Worker training: all workers using scaffold trained in safe access, fall arrest, materials handling, exit procedures. 7. Material control: only the load-class for which the scaffold is designed; no overloading. 8. Modifications: only by trained scaffolders, with re-inspection and re-tagging. 9. Dismantling: top-down sequence, full PPE, no throwing of components. 10. Documentation: all inspections, tag changes, modifications, accident/near-miss records logged for regulatory inspection.

IS 3696 Part 1 anchors all of this — the legal baseline below which the project owner and contractor are liable for unsafe practice. For modern formal projects, also cite IS 16800 for system scaffolds and the National Building Code NBC 2016 Part 7 Section 1 for construction safety.