New York Building Code - Brick Building Practice

Stone ashlar shall be anchored to the backing; and the backing shall he of sneh thickness as to make the walls, independent of the ashlar, conform as to the thickness with the requirements of sections 31 and 32 of this Code, unless the ashlar be at least 8 inches thick and bonded into the backing, and then it may be counted as part of the thickness of the wall.

Iron ashlar plates used in imitation of stone ashlar on the face of a wall, shall be backed up with the same thickness of brickwork as stone ashlar.

Sec. 30. Mortar for Walls and Ashlar, All foundation walls, isolated piers, parapet walls, and chimneys above roofs shall be laid in cement mortar ; but this shall not prohibit the use in cold weather of a small proportion of lime to prevent the mortar from freezing. All other walls built of brick or stone shall be laid in lime, cement, or lime and cement mortar mixed.

The backing up of all stone ashlar shall be laid up with cement mortar, or cement and lime mortar mixed; but the back of the ashlar may be pargeted (plastered over) with lime mortar to prevent discoloration of the stone.

See. 31. Walls for Dwelling-Houses. The expression "walls for dwelling-houses" shall be taken to mean and include in this class walls for the following buildings: Dwellings, asylums, apartment houses, convents, club-houses, dormitories, hospitals, hotels, lodging-houses, tenements, parish buildings, schools, laboratories, studios.

The walls above the basement of dwellinghouses not over three stories and basement in height, nor more than 40 feet in height, and not over 20 feet in width, and not over 55 feet in depth, shall have side and party walls not less than 8 inches thick, and front and rear walls not less thal 12 inches thick. All walls of dwellings exceeding 20 feet in width, and not exceeding 40 feet in height, shall be not less than 12 inches thick. All walls of dwellings 26 feet or less in width between bearing walls which are hereafter erected or which may be altered to be used for dwellings, and being over 40 feet in height and not over 50 feet in height. shall be not less than 12 inches thick above the foundation wall. No wall shall be built having a 12-inchthick portion measuring vertically more than 50 feet. If over 50 feet in height and not

over 60 feet in height, the wall shall be not less than 16 inches thick in the story next above the foundation walls; and from thence not less than 12 inches to the top. If over 60 feet in height, and not over 75 feet in height, the walls shall he not less than 16 inches thick above the foundation walls to the height of 25 feet, or to the nearest tier of beams to that height; and thence not less than 12 inches thick to the top. If over 75 feet in height, and not over 100 feet in height, the walls shall be not less than 20 inches thick above the foundation walls to the height of 40 feet, or to the nearest tier of beams to that height; thence not less than 18 inches thi& to the height of 75 feet, or to the nearest tier of beams to that height, and thence not less than 12 inches thick to the top. If over 100 feet in height, and not over 125 feet in height, the walls shall be not less than 24 inches thick above the foundation walls to the height of 40 feet, or to the nearest tier of beams to that height; thence not less than 20 inches thick to the height of 75 feet, or to the nearest tier of beams to that height: thence not less than 16 inches thick to the height of 110 feet, or to the nearest tier of beams to that height; and thence not less than 12 inches thick to the top. If over 125 feet in height, and not over 150 feet in height, the walls shall be not less than 28 inches thick above the foundation walls to the height of 30 feet, or to the nearest tier of beams to that height; thence not less than 24 inches thick to the height of 65 feet, or to the nearest tier of beams to that height; thence not less than 20 inches thick to the height of 100 feet, or to the nearest tier of beams to that height ; thence not less than 16 inches thick to the height of 135 feet, or to the nearest tier of beams to that height; and thence not less than 12 inches thick to the top. If over 150 feet in height, each additional 30 feet in height or part thereof, next above the foundation walls. shall be increased 4 inches in thickness, the upper 150 feet of wall remaining the same as specified for a wall of that height.