Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 47 - MISCELLANEOUS PROVISIONS
Subchapter J - WINDOW CLEANING
GENERAL PROVISIONS
Section 47.379 - Methods of fastening anchors

(1) Brick masonry and concrete construction. Bolts or shanks shall be not less than eight inches in length and shall be imbedded their full length or shall extend through the wall. They shall be not less than 3/8 inch in diameter if round and shall be forged or rolled. If rectangular, they shall be not less than 1/4 inch in thickness and having a minimum sectional area of at least as great as a 3/8 inch diameter round. These bolts or shanks shall have either a right angle bend of at least 2 inches at the end or a metal washer riveted, or otherwise securely fastened to the end of the bolt or shank. The washer shall be at least four square inches in area and shall be imbedded in the masonry. Bolts or shanks shall be made of the same material as the anchor.

(2) Wood construction. Bolts or shanks shall be not less than 3/8 inch in diameter made of the same material as the anchor, shall pass through the entire window frame or mullion, and shall be securely fastened by a nut and washer. The ends of the bolts or shanks shall be upset to prevent loosening or removal of the nuts.

(3) Hollow metal frame construction. The anchor fittings shall be attached by three bolts 5/16 inch in diameter, of the same material as the anchor and shall pass through a steel plate not less than 5/16 inch thick, 3/4 inch wide by 6 inches long. This steel plate shall be bolted or riveted by at least two 1/4 inch bolts, screws or rivets of the same material as the anchor to a part of the frame protected by masonry or concrete. The ends of all bolts shall be upset to prevent loosening or removal of the nuts. As an alternate, each anchor fitting may be attached to the frame and reinforcing plate by means of at least three 5/16 inch screws of the same material and strength as the anchor, threaded and screwed into the plate to a depth of at least 5/16 inch. All screws used in the installation of anchors to metal frame construction shall have the threads terminate far enough from the screw head to prevent weakening due to undercutting.

(4) Solid metal construction. Anchor fittings shall be attached by three 5/16 inch bolts of the same material as the anchor. The bolts shall pass through the frame and shall be securely held in place by nuts and washers on the inside. The ends of the bolts shall be upset to prevent loosening or removal of the nuts. Where the nature of the solid metal frame construction is such that this method cannot be followed, it is permissible to drill and tap the metal frame and install the anchor with at least three 5/16 inch diameter screws made of the same material as the anchor and screwed into the frame to a depth of at least 3/8 inch. All screws used in the installation of anchors to metal frame construction shall have the threads terminate far enough from the screw head to prevent weakening due to undercutting.

(5) Other approved method. Any other method of attaching anchors shall be approved by the Department.