What is the minimum thickness for lime concrete roof waterproofing?

The average thickness should not be less than 75 mm, and strictly not less than 50 mm at any single point.

What is the recommended slope for roof drainage?

A fall of not less than 1 in 60 is recommended to ensure proper drainage.

How long should lime concrete be cured?

It must be cured continuously by ponding water or keeping it wet using gunny bags for a minimum of 14 days.

IS 3036

: 1992

Code of practice for laying lime concrete for a waterproofed roof finish

CurrentSpecializedCode of PracticeArchitectural · Waterproofing and Damp-Proofing

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This code provides guidelines for the preparation, laying, beating, and curing of lime concrete to create a waterproof finish on flat roofs. It details traditional terrace waterproofing methods frequently used in regional construction and heritage building restoration.

Code of practice for laying lime concrete for a waterproofed roof finish

Quick Reference Values

minimum average thickness75 mm

absolute minimum thickness at any point50 mm

recommended roof fall slope1 in 60

minimum curing period14 days

Practical Notes

Continuous and uniform compaction via hand beating with wooden thapies is critical; it must continue until the mortar starts creaming on top.

Ensure the roof slab has the correct slope before laying the concrete, or properly build the required slope into the lime concrete layer itself.

Protect freshly laid lime concrete from heavy rains or extreme drying heat during the initial setting phase.