Heavy-Duty RCC Roof Slab Casting (छत ढलाई) in Muzaffarpur
Engineered shuttering support, Fe500D rebar grid spacing, concrete cover blocks, and vibrated M20 machine pouring.
Execution Process & Quality Benchmarks
Roof slab casting (छत ढलाई) is the single most critical milestone in home construction. A mistake in shuttering level, rebar spacing, or concrete compaction cannot be repaired later.
Shyam Kumar Sah personally oversees every slab pour: verifying shuttering props (बल्ली-प्लेट), installing 20mm concrete cover blocks under the steel mesh, ensuring electrical fan boxes are secured, and managing the needle vibrator operator to prevent honeycombing.
Roof Slab Casting Protocol:
Rigid Steel / Plywood Shuttering
Watertight level shuttering with strong vertical props and bracing to prevent sagging under wet concrete weight.
Steel Rebar Binding & Spacing
Main and distribution steel rebar tied with binding wire, bent-up crank bars at supports, and beam cages aligned.
Cover Block Placement (कवर ब्लॉक)
20-25mm concrete spacer blocks placed under all rebar to guarantee steel is fully encased and protected from rust.
Machine Mixing & Needle Vibration
M20 grade concrete (1:1.5:3) mixed in mechanical hoists, poured systematically, and compacted with mechanical needle vibrators.
Water Ponding Curing (कियारी बनाना)
Cement mortar bunds created next morning to keep the slab submerged under 2 inches of water for 14-21 continuous days.
Personal Supervision Guarantee
How many days should water remain on the roof slab after casting?
A minimum of 14 days of continuous water ponding (कियारी में पानी) is mandatory in Bihar's climate for concrete to attain 90%+ design strength.
Have a house project in mind?
Get in touch directly with Shyam Ji. Ask for labour rates, discuss your home map, or arrange a site visit in Muzaffarpur.