What is a Madras terrace roof?

A composite floor/roof construction using timber or steel joists, a layer of specially sized bricks laid on edge diagonally, and a top layer of lime or brick-bat concrete.

What is the standard spacing for joists in a Madras terrace?

Joists are typically spaced between 300 mm and 450 mm center-to-center to safely support the diagonal brickwork.

How long should the concrete course be cured?

The concrete course should be kept continuously damp and cured for a minimum of 14 days.

IS 2119

: 1980

Code of practice for construction of brick-cum-concrete composite (madras terrace) floor and roof

CurrentSpecializedCode of PracticeStructural Engineering · Building Construction Practices incl. Painting, Varnishing

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Provides guidelines for the construction of traditional Madras terrace floors and roofs, which consist of edge-laid bricks over closely spaced joists, topped with a brick-bat concrete course. The code details material specifications, laying procedures, and curing methods, primarily relevant today for heritage conservation and traditional building practices.

Code of practice for construction of brick-cum-concrete composite (madras terrace) floor and roof

Quick Reference Values

Joist spacing300 mm to 450 mm

Minimum roof slope for drainage1 in 30

Typical size of terrace bricks150 x 75 x 25 mm

Minimum curing period14 days

Bearing of joists on wallsNot less than 100 mm

Practical Notes

Bricks must be laid on edge diagonally at an angle of 45 degrees to the joists to form a structural arching effect.

Joists must be extremely rigid; excessive deflection will cause the brittle brick-and-mortar terrace to crack.

Lime mortar or composite mortar is preferred over pure cement mortar to accommodate slight thermal movements and reduce shrinkage cracks.