(1) Masonry curtain-walls shall be tied to the horizontal and vertical structural members of the building frame by means of corrosion-resistant anchors, which are secured to such members with fastenings which develop the full strength of the fastenings which develop the full strength of the anchor, and there shall be at least anchor for each 0,8 square metre or remaining portion thereof of face-area of the curtain wall, and anchors shall be evenly spaced along such members.

(2) The anchors referred to in subsection (1) shall have the minimum dimensions set out in Table IV.

TABLE IV
ANCHORS FOR CURTAIN-WALLS

(3) Materials not mentioned in Table IV shall not be used for anchors unless they are tested, and the local authority is of the opinion that they are equally satisfactory to those mentioned in Table IV:

Provided that the curtain-wall may be fixed to the frame by some other means acceptable to the local authority.