Roof slab Concrete Work | Slab Concrete Work | Slab Casting Work | Slab Work | Roof Slab Casting

Concrete work for a *roof slab* is a crucial phase in building construction. It involves several steps to ensure structural integrity, durability, and water resistance. Below is a step-by-step guide:

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🏗️ *Roof Slab Concrete Work – Step-by-Step*

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#### *1. Shuttering (Formwork)*

**Material Used**: Plywood, steel plates, timber, etc.
**Check**: Ensure formwork is level, properly supported, and tightly sealed to prevent leakage.
**Oil Application**: Apply shuttering oil for easy removal.

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#### *2. Reinforcement Placement*

**Bar Bending Schedule (BBS)**: Follow structural drawing for correct bar size, spacing, and cover.
**Binding**: Tie steel bars using binding wire.
**Cover Blocks**: Maintain clear cover (usually 20–25mm for roof slabs).
**Check**: Ensure no rust or mud on steel.

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#### *3. Electrical & Plumbing Conduits*

Lay electrical pipes and plumbing conduits **before concreting**.

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#### *4. Concrete Mixing*

**Grade of Concrete**: M20, M25, or as per design.

M20 = 1:1.5:3 (Cement: Sand: Aggregate)
**Mixing Methods**:

*Manual* (for small jobs)
*Machine Mixers / RMC (Ready Mix Concrete)* – preferred for better quality.

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#### *5. Pouring Concrete*

Start from one end and pour in layers.
Use *vibrators* to remove air voids and ensure compaction.
Maintain continuous pouring to avoid cold joints.

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#### *6. Finishing*

Use trowel/float for surface leveling.
Maintain proper *slope* (1:100 or 1:150) for water drainage.
Mark out areas for *sunken slabs* (if any) for toilets/kitchens.

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#### *7. Curing*

Start curing after 24 hours of casting.
Method: Ponding or sprinkling water.
Duration: Minimum *7 days* (for ordinary Portland cement), ideally *14–21 days* for full strength gain.

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#### ✅ *Checklist Before Concreting*

✔️ Shuttering and supports secure
✔️ Reinforcement tied as per drawing
✔️ Electrical/plumbing sleeves placed
✔️ Slab thickness verified
✔️ Material quality and mix checked
✔️ Water available for curing

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🧱 Tools & Equipment Required

Concrete mixer or pump
Vibrators
Wheelbarrows
Trowels & floats
Measuring box
Water source and curing materials

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