Section 33 in Haryana Municipal Building Bye-laws 1982
33. Hollow bricks and block walls.
- Where any wall or any part of a wall is constructed as a hollow wall, -(i)the cavity between the inner and outer parts of the wall shall throughout be of a width not exceeding 10 centimeters (cm) ;(ii)the inner and outer parts of the wall shall be securely tied together with suitable bonding ties of adequate strength of galvanized irontarred and sanded stone ware, copper, bronze or other suitable materials, the ties being placed at distances apart not exceeding 1 metre horizontally and 0.5 metre vertically ;(iii)the inner and outer parts of the wall shall each be not less than 10 cm. thick throughout except that in a wall not exceeding 6 metres length and 6 metres in height, the thickness of each part may not be less than 10 cm. throughout if all courses of less height than 15 cm. are put together with cement mortar or the wall has at least twice the number of ties required by the preceding clauses;(iv)the cavity may be reckoned as part of the thickness prescribed for walls by these bye-laws where such thickness does not exceed 20 cm. but shall not be so reckoned where such thickness exceeds 20 centimeters. All external cavity walls shall be ventilated.
