Code of practice for the application of lime plaster finish 1984 Edition
The 1984 edition of IS 2394 offers detailed instructions for applying lime plaster finishes, covering aspects such as material selection, surface prep, mixing ratios, application methods, curing, and specialized finishes. It primarily addresses interior plastering where lime acts as the main binder, including single, double, and triple coat systems on various masonry substrates. This standard serves as a vital resource for architects, engineers, and construction specialists engaged in traditional and eco-friendly plastering techniques in India.
The 1984 edition of IS 2394 offers detailed instructions for applying lime plaster finishes, covering aspects such as material selection, surface prep, mixing ratios, application methods, curing, and specialized finishes. It primarily addresses interior plastering where lime acts as the main binder, including single, double, and triple coat systems on various masonry substrates. This standard serves as a vital resource for architects, engineers, and construction specialists engaged in traditional and eco-friendly plastering techniques in India.
Audience
Who Uses This Standard
Structural engineers
Design architects
Site supervisors
Skilled plasterers and masons
Heritage restoration experts
Quality assurance professionals
Building materials vendors
Contents
Key Topics Covered
✓Varieties of lime plaster finishes
✓Materials and their corresponding Indian Standards
✓Preparation of masonry and substrate surfaces
✓Mixing ratios and mortar formulation
✓Techniques for one, two, and three-coat plastering
✓Recommended plaster thickness for different masonry
✓Curing methods and recommended periods
✓Specialized finishes such as Madras plaster
✓Proper handling and storage of materials
✓Maintenance of tools and equipment
✓Preventive measures against cracking and corrosion
✓Environmental and climatic considerations
Structure
Table of Contents
1Scope and Coverage
2Referenced Indian Standards
3General Requirements and Essential Information
4Plastering Work Scheduling Guidelines
5Materials, Tools, and Accessories Specifications
6Proper Storage of Construction Materials
7Tool Cleanliness and Maintenance Procedures
8Characteristics and Suitability of Lime Plaster
9Precautionary Measures During Plastering
10Preparation of Background Surfaces for Plaster
11Surface Preparation and Dubbing Out Techniques
12Mortar Mixing and Proportioning
13Application Procedures for Plaster Coats
14Plaster Curing Requirements
15Specialized Plaster Finishes
16Plaster Repair and Maintenance
Frequently Asked
Popular Questions About IS 2394
?What are the suggested thicknesses for lime plaster coats on various masonry surfaces?▼
Per IS 2394 (Clause 8.7, Table 1), recommended lime plaster thicknesses vary depending on masonry type and number of coats:
Masonry Type
First Coat (mm)
Second Coat (mm)
Third Coat (mm)
Brick masonry - Single coat
15
-
-
Brick masonry - Double coat
10
10
-
Stone masonry
15
10
-
Very rough stone masonry
15
10
10
Additional notes include allowing 2 to 4 days for the initial coat to set, followed by diagonal scouring before applying subsequent coats. Continuous moist curing until the plaster nearly sets is essential for proper adhesion and finish.
?Which materials conforming to Indian Standards are specified for lime plaster preparation?▼
IS 2394 specifies the following Indian Standards for materials used in lime plaster preparation:
Lime: IS 712-1973
Lime Putty: IS 1635-1975
Pozzolana (optional): IS 1344-1981 and IS 3812-1981
Sand: IS 1542-1977
Cement (optional in some mixes): IS 269-1976, IS 455-1976, IS 1489-1976
Wood lath and timber (for lath plaster): IS 1331-1971
These standards ensure materials meet quality and suitability requirements for Indian construction and climate conditions.
?How should the background surface be prepared before applying lime plaster?▼
According to IS 2394, background surface preparation involves several key steps:
Complete installation of fixtures such as doors, windows, and embedded pipes before plastering.
Roughen smooth surfaces by wire brushing (if soft) or hacking (if hard) to enhance mechanical bonding.
Clean and dry all surfaces thoroughly; rake out mortar joints to a minimum depth of 12 mm.
Evenly moisten the surface prior to plaster application to control suction and prevent premature drying.
When necessary, provide mechanical keying using wood lath, expanded metal lath, or wire mesh.
This thorough preparation ensures strong adhesion and long-lasting plaster finishes.
?What are the curing requirements and duration for lime plaster finishes?▼
IS 2394 mandates that curing should commence 24 hours after plaster application and continue by keeping the surface constantly wet for a period of 7 days. During curing, plaster must be shielded from physical damage, and dates of application should be clearly marked on the walls to monitor the curing timeline. For special finishes, the first coat must set for 2 to 4 days before diagonal scouring and application of subsequent coats. Continuous watering is critical to ensure proper strength development and durability of lime plaster.
?Can lime plaster be used for external surfaces in heavy rainfall areas according to this standard?▼
IS 2394 explicitly states that lime plaster is unsuitable for exterior surfaces in regions experiencing heavy rainfall, very damp conditions, or where high water tightness is necessary. This is due to lime plaster’s porous nature and lower water resistance compared to cement-based alternatives. For such external applications, especially in heavy rain zones, cement plasters or other waterproof finishes are recommended to ensure durability and weather resistance.
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