§ 6.17. Bricklayers’ squares scaffolds.
(a) Planking. Platform boards shall be at least two inches in thickness by 10 inches wide and shall overlap the squares by at least 4 inches but not more than 6 inches. All planks shall extend over three squares.
(b) Distance between squares. Squares shall be placed at intervals not greater than 5 feet if used as a heavy-duty scaffold and 7 feet 6 inches if used as a light-duty scaffold. Platform boards shall be laid so that they bear on all of the squares under the platform planks.
(c) Bracing. Squares shall be diagonally braced both from the front and rear, and from the top and bottom; that is, from the top and bottom of one to the bottom and top of the next adjacent one.
(d) Pyramiding. When pyramided, one square shall be placed directly above another, the braces shall be used to prevent the scaffold from pulling away from the building. Diagonal bracing for each tier shall be in accordance with subsection (c). Scaffolds shall not be built more than four tiers in height. The upper tiers shall stand on continuous rows of planks laid across the lower tier, nailed down and cleated on the underside on each side of the supporting square to prevent movement of the planks and prevent swaying of the scaffold.
(e) Size of squares. The squares shall have no side larger than 5 feet.
(f) Size of lumber. The side members of jacks shall be at least 2 by 4 inch lumber and shall abut one another. Supporting blocks 2 by 1 inches and 6 inches long shall be nailed 4 inches from the ends of the two longer side members, so as to support the shorter of the other two side members. The corners shall then be braced on both sides with braces one inch in thickness, cut in the form of right angle triangles, the legs of which shall be 14 inches long. These braces shall be securely nailed to both abutting side members. This type of square may be used with the sides and bottom and top reversible.
(g) Protection. Protection shall be afforded as set forth in § 6.32 (relating to protection).
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