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Detailed specification of stone masonry in 1:6 mortar

Short answer

Stone mansonry with hard durable stone in1:6 cment sand mortar. Stones laid on full bed with filled jointes; through stones at1.5–2 m intervals. Joint thickness ≤20 mm. Curing7 days. Measured in m³.

Write down the specification for stone masonry work in 1:6 mortar.

Detailed specification: stone masonry in cement sand mortar 1:6

Scope: Constructing random rubble/coursed rubble stone masonry in cement sand mortar 1:6 in foundations and walls as per drawings.

Materials

  • Stone: hard, sound, durable, free from cracks, weathering, soft veins and dirt; locally available (e.g. granite, limestone or river boulders), compressive strength not less than 5 N/mm² and water absorption below 5%. Stones are generally not less than 150 mm thick, with a length not more than three times the height. Face stones are dressed to the line; stones are cleaned and wetted before use.
  • Mortar: cement sand 1:6 by volume, with clean coarse sand, fresh OPC/PPC and potable water, mixed uniformly and used within 30 minutes.

Workmanship

  • The foundation bed is cleaned and levelled; the first course is laid with the largest stones.
  • Stones are laid on their natural bed in a full bed of mortar; joints are fully filled, and spalls (chips) are used to fill the gaps so that no voids remain. The hearting is packed with smaller stones and mortar.
  • The stones are laid with good bond, and vertical joints are staggered. Bond (through) stones are provided at 1.5–2 m intervals in each course. In walls up to 600 mm thick, a through stone runs across the full thickness; in thicker walls, a set of two or more bond stones overlapping each other by at least 150 mm is used.
  • Joints are not more than 20 mm thick for rubble work; corners and jambs are built of selected, dressed stones.
  • The work is raised evenly, by not more than 1 m per day, and brought to level at about 600 mm height intervals.
  • The face is kept plumb, checked with a plumb bob and line.
  • Faces to be plastered or pointed are raked 15–20 mm deep while the mortar is green.

Curing: Wet curing for at least 7 days, with protection from rain and sun.

Measurement and payment: in cubic metres of finished masonry, with no deduction for openings below 0.1 m². The rate includes materials, scaffolding, curing and all labour.

✓ Answer checked by Claude Opus 5.5 (high effort)

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