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216 addition to its own wei."ht. (b) Cavi ty wall means built of masonry units or of plain concrete, or of' a combination of these materials, so arranged as to provide an air space wi. thin the wall, and in which the inne~ and outer parts of the wall are tied together with metal ties. CURTAIN WALL 100 ans a non-bearing wall between columns or piers and which is not supported by girders or beams. FACE]} WALL means a wall in which the masonry facing and backing are so bonded as to exert corunon action under load. (c) (d) (e) FIRE WALL 100ans a wall of' non-combustible material having fire resis!'l> tance as follows: storage occupance four (4) hours, business occupancy three (3) hours, all other occupancies two (2) hours. Fire walls shaJ.1, subdivide a building or separate buildings to restrict the spread of fire and which starts at the foundation and extends continuously through all the stories to and above the roof, except where the roof is fire- proof or semi-fireproof and the wall is carried up tightly against the under side of the roof slab. (NOTE: Fire walls must include sta- bility under extreme fire conditions as well as resist the effects of fire. It is therefore necessary that a fire wall be considered as a special device requiring careful consideration of the use of materials and the worlonanshipe) (f) FOUNDATION '1lJiALL mans a wall below the first floor extending below the adjacent ground level and sernng as support for a wall, pier, column or other structural part of a building. (g) HOLLOW WALL OF HASONRY means a wall built of masonry units so arranged as to provide an air space within the wall, and in which the inner and outer parts of the wall are bonded together with masonry units. (h) NON-BEARING viALL means a wall which supports no vertical load other than its own weight. (i) PARTY WALL means a 'wall used or adapted for joint service between two (2) buildings. (j) PANEL WALL means a non-bearing wall in skeleton construction, built betw'een columns or piers and ~1011y supported at each story. (k) RETAINING WALL means any wall used to resist the lateral displacement of any material including liquids. 2-83 WASTE PIPE is any pipe which receives the discharge of any fixture, except water-cL,sets, and conveys the same to the building drain, soil, or waste stacks. When such pipe does not connect directly with a building drain or soil stack, it is termed a special waste. 2~84 WATER DISTRIBUTION PIPES are those which convey water from the service pipe to the plumbing fixtures. 2-85 HATER SERiICE PIPES are pipes from the water main to the building served. 2-86 Wi'JTING includes printing and typewriting. 2-87 WlUTTEN NOTICE shall be considered to have been serv"ed if delivered at or -13-