(1) Where the joisted timber or precast concrete floors are to be regarded as providing lateral restraint to the supporting-wall at the level of the floor, anchors shall be provided to secure the bearers or joists or flooring-units to the wall at distances apart not greater than 1,8 metres, measured along the wall extending through two storeys, or not greater than 1,2 metres for a wall extending through more than two storeys.

(2) The anchors referred to in subsection (1) shall-

a) be of corrosion-resistant metal or protected metal; and

b) have a cross-section of not less than millimetres, or equivalent area; and

c) have a length of not less than 600 millimetres; and

d) be securely fastened to timber joists by screws, nails or bolts; and

e) be anchored in the wall by means of split and upset ends, or by other effective means.

(3) Where the restrained wall is parallel to timber joists, such anchors shall be secured to not less than three joists with fastenings which can develop the full strength of the anchor, and herring-bone or solid strutting of cross-section not less that 38 x 38 millimetres shall be provided between three joists nearest the wall.

(4) The strutting referred to in subsection (3) shall be at right angle to the joists and opposite the wall-anchor.

(5) Where such a wall is parallel to precast flooring-units –

a) the anchors shall be carried over at least three supporting units or extend at least 750 millimetres from the wall; and

b) the ends shall be turned down at least 50 millimetres between units or into in situ concrete ribs; and

c) such anchors shall be protected from corrosion by a dense cement-mortar topping not less than 25 millimetres in thickness.

(6) In the case of cavity-walls, such anchors need to be fixed in the nearer leaf only.