(a) that wooden trusses are not erected unless the manufacturer’s specifications for the safe erection of the wooden trusses are readily available on the project site, and

(b) that wooden trusses are erected in accordance with the manufacturer’s specifications referred to in paragraph (a).

(a) are kept on the project site, and

(b) are made available to an officer on request.

(a) that wooden trusses are not erected unless the manufacturer’s specifications for the safe erection of the wooden trusses are readily available on the project site, and

(b) that wooden trusses are erected in accordance with the manufacturer’s specifications referred to in paragraph (a).

(a) are kept on the project site, and

(b) are made available to an officer on request.

(a) that wooden trusses are not erected unless the manufacturer’s specifications for the safe erection of the wooden trusses are readily available on the project site, and

(b) that wooden trusses are erected in accordance with the manufacturer’s specifications referred to in paragraph (a).

(a) are kept on the project site, and

(b) are made available to an officer on request.