MILL CONSTRUCTION BUILDINGS __ 



In small buildings or structures located well out of con- 

 flagration districts and separated from other buildings, exterior 

 walls are occasionally made of heavy timber construction as 

 in the case of floors. The posts which are to form the exterior 

 framing should be of a size needed to carry the load from the 

 floor above, but should not be less than 10 inches by 10 inches. 

 These posts should be spaced from 8 to 10 feet apart as in 

 the case of the floor girders, and should be thoroughly braced 

 at the corners of the building and around openings to provide 

 stiffness. 



The walls may be of plank 2 inches or more in thickness. 

 Tongued and grooved or splined material is placed vertically 

 and nailed to horizontal girths extending between the posts. 

 Square-edged plank may be used by covering the cracks with 

 1/2-inch battens. If metal siding or slate is to be used as an 

 exterior finish, the planks should be placed horizontally and 

 fastened to the posts and intermediate studs if needed. Planks 

 nailed diagonally will aid in stiffening the building, but there 

 is a small waste of material involved. All interior surfaces 

 should be left exposed so that water may reach them easily 

 in case of fire. 



Fire and Fire walls and party walls should be built of 



Party Walls brick or reinforced concrete and should extend 

 3 feet above roof. The thickness and general 

 design is regulated by the local ordinance, or may be governed 

 by the recommendations of the National Board of Fire Under- 

 writers. For the sake of economy designers should take care 

 to keep the floor areas of the maximum proportions at which 

 fire walls are not required, as the cost of fire walls and the 

 protection of openings in walls, add materially to the cost of a 

 structure. Maximum floor areas between fire walls or exte- 

 rior walls of mill construction buildings not over 65 feet high 

 as recommended by the National Board of Fire Underwriters 

 are as follows: 



Without With 



Sprinklers Sprinklers 



Building fronting on one street 6,500 sq. ft. 13,000 sq. ft. 



Building fronting on two streets 8,000 sq. ft. 16,000 sq. ft. 



Building fronting on three or more streets. .10,000 sq.ft. 20,000 sq.ft. 



Local building ordinances may vary from these areas and 

 should be consulted in any case. Many examples may be 



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