What is the recommended thickness for a single coat of lime plaster?

The thickness should generally be between 10 to 15 mm.

Which IS code specifies the requirements for sand used in lime plaster?

Sand used for plastering should conform to the requirements of IS 1542.

How should masonry joints be prepared before applying plaster?

Joints should be raked to a depth of at least 10 mm while the mortar is still green to provide a proper key for the plaster.

IS 2394

: 1984

Code of practice for the application of lime plaster finish

CurrentSpecializedCode of PracticeArchitectural · Flooring, Wall Finishing and Roofing

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This code establishes the guidelines and procedures for the application of lime plaster finishes to internal and external building surfaces. It details background preparation, material selection, mix proportioning, and techniques for single and multi-coat plaster applications.

Code of practice for the application of lime plaster finish

Quick Reference Values

thickness single coat10 to 15 mm

thickness base coat two coat work10 to 12 mm

thickness finishing coat two coat work3 to 8 mm

thickness base coat three coat work10 to 15 mm

thickness second coat three coat work5 to 9 mm

Practical Notes

Proper slaking of quicklime (as per IS 1635) and adequate aging of lime putty is crucial to prevent popping, pitting, and blistering in the finished plaster.

Adequate drying and partial carbonation time must be allowed between successive coats.

Background surfaces must be properly roughened (raking of masonry joints) and thoroughly wetted to ensure mechanical key and proper bond without sucking moisture from the fresh plaster.