05/01/2026
When inspecting slab formwork for a storey building, especially for reinforced concrete floors, the following key items should be carefully checked to ensure safety, accuracy, and quality before casting:
1. SETTING OUT & LEVELS
✅ Correct slab thickness as per structural drawings
✅ Proper floor level and camber (if specified)
✅ Accurate beam and slab dimensions
✅ Alignment with column and wall grid lines
2. FORMWORK MATERIAL
✅ Formwork boards / plywood are clean, undamaged, and of adequate thickness
✅ No excessive warping or gaps that may cause grout leakage
✅ Formwork surfaces properly oiled (release agent)
3. PROPS, SHORES & SUPPORTS
✅ Props are vertical, firm, and properly seated on sole plates
✅ Adequate spacing of props (not overstretched)
✅ Props are tight and well-braced against buckling
✅ Double propping for upper floors where required
4. BEAM & SLAB SUPPORT SYSTEM
✅ Primary and secondary beams (joists) correctly spaced
✅ Bearers and ledgers securely fixed
✅ No sagging in formwork; adequate stiffness to carry wet concrete + workers
5. STABILITY & SAFETY
✅ Proper cross bracing to prevent lateral movement
✅ Safe access for workers (ladders, platforms)
✅ Edges protected to prevent falls
✅ Formwork can withstand vibration during compaction
6. OPENINGS & EMBEDDED ITEMS
✅ Correct positioning of service ducts, sleeves, conduits, and pipes
✅ Floor openings (staircase, lift, services) properly boxed out
✅ Boxes securely fixed to prevent displacement during casting
7.REINFORCEMENT CLEARANCE READINESS
(Before steel fixing proceeds or prior to casting)
✅ Adequate allowance for cover blocks
✅ Formwork allows correct concrete cover
✅ No nails or wires protruding into concrete zone
8. JOINTS & SEALIMG
✅ Tight joints to prevent grout loss
✅ Sealed beam–slab junctions
✅ Edges straight and properly supported
9. CLEANLINESS
✅ Formwork free from dust, sawdust, debris, water, or oil pools
✅ No standing water before concrete placement
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