(1) Strap hangers may be used for all pipes of nominal bore up to 50 millimetres, but ring hangers shall be used for all pipes of greater size.

(2) All pipes, except those laid in the ground, shall be securely fixed at frequent intervals to that portion of the wall or other rigid portion of the structure along which they pass, to preclude sagging.

(3) Watertight joints to walls or floor shall be made where pipes or fittings pass though such walls or floors or are fixed thereto.

(4) The connexion of pipe-supports to masonry, brickwork, stone or concrete backing shall be made without the use of wooden plugs.