What is the standard thickness for cement concrete floor topping?

The minimum recommended thickness is 25 mm, though 40 mm or 50 mm is commonly used for areas expecting heavy traffic.

How should floor panels be sized?

Panels should typically be restricted to 2 m x 2 m or up to 3 m x 3 m, with a length-to-width ratio not exceeding 1.5, to minimize shrinkage cracking.

What is the required curing period for the topping?

The surface should be kept continuously wet (e.g., by ponding or wet hessian cloth) for a minimum of 7 to 10 days.

IS 2509

: 1986

Code of Practice for Cement Concrete Floor Topping

CurrentFrequently UsedCode of PracticeArchitectural · Flooring and Paving

Archive.org BIS Portal Google

This code of practice covers the requirements, materials, and recommended methods for laying in-situ cement concrete floor topping (often referred to as Indian Patent Stone or IPS flooring) over a prepared base to ensure a durable, crack-free, and wear-resistant surface.

Specifies the procedure for laying cement concrete toppings on existing or new concrete base floors to provide a wearing surface.

Quick Reference Values

minimum topping thickness25 mm (up to 40-50 mm for heavy traffic)

maximum length to width ratio of panels1.5

typical panel size2 m x 2 m to 3 m x 3 m

curing durationMinimum 7 to 10 days

Practical Notes

Thoroughly roughen and clean the base concrete, then apply a neat cement slurry immediately before laying the topping to ensure a proper bond.

Divide the floor into panels using glass, brass, or aluminum strips to localize and control shrinkage cracks.

Avoid excessive steel trowelling while the concrete is wet, as it draws water and cement to the surface, leading to dusting and crazing.