IS 6042:1969 is the Indian Standard (BIS) for construction of lightweight concrete block masonry. This code of practice details the requirements for the construction of masonry using lightweight concrete blocks. It covers the specifications for materials like blocks and mortar, workmanship for laying and jointing, and procedures for curing to ensure structural integrity and durability.
Code of practice for construction of lightweight concrete block masonry
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Nominal Mortar Joint Thickness | Shall not exceed 10 mm | 10 mm (nominal); 3/8 in. (9.5 mm) (nominal) | BS EN 1996-2 / TMS 602-16 |
| Mortar Specification Approach | Prescriptive by proportion (e.g., 1:2:9 Cement:Lime:Sand) | Performance-based by Type (M, S, N, O) or Strength Class (M12, M6, etc.) | ASTM C270 (for TMS 602) / EN 998-2 (for EN 1996-2) |
| Curing Requirement | Keep continuously moist for a period of not less than 7 days. | Protect from freezing and rapid evaporation; maintain temperature above 4°C for 24-48 hours. No prescribed wet curing. | TMS 602-16 |
| Minimum Lap in Running Bond | At least 1/4 of the block length. | The greater of 0.4 x block height or 40 mm. | BS EN 1996-2:2006 |
| Slenderness Ratio Limit (Single Leaf Load-Bearing Wall) | 12 (Prescriptive limit) | Calculated based on support conditions and eccentricity (e.g., can be up to 27), not a single prescriptive value. | BS EN 1996-1-1 |
| Vertical Chase Depth Limit | Max 1/3 of wall thickness. | Max 1/3 of wall thickness (unreinforced masonry). | BS EN 1996-2:2006 |