Par. 1. - All walls of a first or second class building meeting at an angle shall be securely bonded, or shall be united every five feet of their height by anchors made of at least two inches by half an inch of steel or wrought iron, well painted, and securely built into the side or partition walls not less than thirty-six inches, and into the front and rear walls at least one half the thickness of such walls.

Section 25. Brickwork - Bonding

Par. 1. - Every eighth course, at least, of a brick wall shall be a full heading or bonding course, except where walls are faced with face brick, in which case in every eighth course at least every other brick shall be a full header. No diagonal header ties shall be used.

Par. 2. - In a skeleton frame building brick facing of not more than four inches in thickness may be bonded to the frame by metal ties if other suitable precautions satisfactory to the commissioner are taken. Such ties shall be of galvanized wire or other suitable material satisfactory to him.

[1918, Special Acts, c. 179, sect. 12.]

Section 26. Vaulted Walls

Par. 1. - If the air spaces are headed over and the walls are built solid for at least three courses below the floor and roof beams, walls, if of brick, may be built hollow. They shall contain, exclusive of withes, the same amount of material as is required for solid walls, and the masonry on the inside of the air space in walls over two stories in height shall be not less than eight inches thick, and the parts on either side shall be securely tied together with ties not more than two feet apart in each direction.