IS 1597 (Part 1) : 2000Construction of Stone Masonry - Code of Practice, Part 1: Rubble Stone Masonry

IS 1597 Part 1:2000 is the code of practice for construction of stone masonry — Part 1: rubble stone masonry (Part 2 covers ashlar masonry). It governs the materials, bond, workmanship and quality of random/coursed rubble stone masonry — still widely used in India for foundations, plinths, retaining walls, compound walls, hill construction and heritage-context work.

It is read with the masonry/stone stack:

• IS 1124 / IS 1121 / IS 1123 — stone water-absorption, strength and durability tests
• IS 1905 — structural use of unreinforced masonry (design strength of the masonry)
• IS 2250 — cement-mortar mixes for masonry · IS 2116 — sand for masonry mortar
• IS 1130 / IS 3316 — stone product specifications

IS 1597 Part 1 sets the rules that make rubble masonry a sound structural wall rather than a pile of stones:

• Stone quality — hard, sound, durable stone, free from cracks/decay, of acceptable absorption/strength; large enough stones (no excess of small spalls)
• Bond — stones laid on their natural bed, breaking joint in every direction (no continuous vertical 'through' joints), with bond/through stones at the specified spacing tying the wall across its thickness — the single most important rule
• Mortar — the specified cement (or cement-lime) mortar fully filling all joints; hearting (interior) packed solid with spalls and mortar — *no dry voids/hollow hearting*
• Quoins and corners — larger, well-dressed stones at corners and openings
• Lift and curing — limited daily build height (green masonry slumps), and proper wet curing
• Verticality/thickness — minimum wall thickness and plumb tolerance

Scenario: coursed rubble masonry plinth/retaining wall.

Step 1 — stone acceptance: verify hard, sound stone — visual + IS 1124 absorption / IS 1121 strength on the source; reject veined/weathered stone.

Step 2 — mortar: cement mortar (e.g. CM 1:6, or richer for the retaining/below-ground portion) to IS 2250, with IS 2116 sand.

Step 3 — laying: stones on their natural bed, joints broken in plan and elevation; lay larger stones low; quoin stones at corners.

Step 4 — through stones: provide bond/through stones at the IS 1597 spacing (roughly one per ~0.5 m² of face, staggered) running the full thickness — for thick walls use overlapping bond stones — this ties the two faces together and is what stops a retaining wall bulging.

Step 5 — hearting & curing: pack the hearting solid with mortar and spalls (no hollows); limit daily lift; cure ~7–10 days; provide weep holes + backfill drainage for the retaining case.

Result: a monolithic wall — *because* of bond stones, solid hearting and curing, not merely the face stones.

1. Omitting / under-spacing through (bond) stones. The defining failure — without through stones the two faces act independently and the wall (especially a retaining wall) bulges and splits. This is non-negotiable.

2. Hollow / dry hearting. Interior packed with loose spalls and no mortar leaves voids — the wall is weak, water-permeable and crushes under load.

3. Face-bedded / continuous vertical joints. Stones not laid on their natural bed, or joints not broken, create planes of weakness.

4. Over-fast lift, no curing. Building too high in a day slumps green masonry; skipping curing gives weak, friable mortar joints.

5. Retaining wall with no drainage. Even sound masonry fails if water pressure builds — weep holes and backfill drainage are part of the design, not an extra.

• IS 1597 Part 2 — ashlar stone masonry · IS 1905 — structural use of unreinforced masonry
• IS 1124 — stone absorption/SG/porosity · IS 1121 / IS 1123 — stone strength / durability
• IS 2250 — preparation and use of masonry mortars · IS 2116 — sand for masonry mortar
• IS 1130 — Kota stone · IS 3316 — structural granite · IS 3620 — laterite stone
• IS 456 — RCC bands/coping where combined with masonry
• IS 13828 / IS 4326 — earthquake-resistant detailing of (stone) masonry buildings

IS 1597 Part 1 is reaffirmed and remains the working code for rubble stone masonry, which is still economical and appropriate for foundations, plinths, retaining and compound walls, hill-area construction and heritage-context work where good stone is locally available. Its provisions are old but the engineering is timeless — and almost every rubble-masonry failure in the field reduces to the same three execution defects: missing/under-spaced through stones, hollow un-mortared hearting, and no drainage on retaining walls.

For any stone masonry in seismic zones, IS 1597 must be read with the earthquake-resistant detailing of IS 13828 / IS 4326 (through stones, corner stitching, RCC bands) — unreinforced rubble masonry is intrinsically brittle and performs poorly in earthquakes without that detailing. The practitioner takeaway: specify stone quality and mortar, but supervise the bond stones, solid hearting, lift height, curing and drainage — those, not the face appearance, decide whether a rubble wall lasts a century or bulges in a monsoon.