What is the recommended relationship between the length and height of a building stone?

The length of the stone block should typically not exceed 3 times its height to ensure structural integrity and proper bonding.

What is the minimum breadth permitted for a building stone?

The breadth at the bed of the stone should never be less than the height of the stone.

What is the difference between IS 1127 and IS 1129?

IS 1127 provides recommendations for the dimensions and basic workmanship of stones for masonry, whereas IS 1129 specifically details the methods of dressing natural building stones.

IS 1127

: 1970

Recommendations for dimensions and workmanship of natural building stones for masonry work

CurrentSpecializedGuidelinesMaterials Science · Stones

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This code provides guidelines on standard dimensions and workmanship (dressing, squaring) for natural building stones used in masonry work. It helps ensure uniformity, proper bonding, and structural stability in stone masonry construction such as ashlar and rubble walls.

Recommendations for dimensions and workmanship of natural building stones for masonry work

Quick Reference Values

Minimum breadth of stone blockNot less than the height of the stone

Maximum length of stone block3 times the height of the stone

Minimum height for ashlar masonry stones150 mm

Standard lengths of cut stone300, 450, 600, 750 mm

Practical Notes

Always ensure the breadth of the stone is greater than or equal to its height to prevent instability and overturning within the masonry wall.

Stones must be properly wetted before use in masonry to prevent them from absorbing moisture from the mortar.

For actual construction practices and masonry bond details, refer to IS 1597 rather than this code, which is focused purely on the stone block sizing and dressing.