HEAVY TIMBER MILL CONSTRUCTION BUILDINGS 



found in the cotton and woolen mills of the New England 

 States in which these areas have been exceeded, even in the 

 practice of leading engineers and architects. The weave room 

 of one large mill is said to have a floor area of five and one- 

 third acres. 



Enclosure Walls which serve as enclosures for stairways, 

 Walls elevators, etc., should be self sustaining and of 



incombustible material. Brick walls not less than 

 12 inches thick, or reinforced concrete not less than 8 inches 

 thick are commonly used for this purpose. In special cases 

 where the wall is less than 8 feet on a side and has no openings, 

 a brick wall 8 inches thick may be used if it does not extend 

 more than one story in height. 



The walls of stairways and elevator enclosures when inside 

 of a building should extend through all floors and rise about 

 3 feet above the roof. No interior windows should be allowed, 

 and all openings from the different floors should be protected 

 by automatic fire doors. All stairway doors should be self- 

 closing. 



Belts or power drives should be located in a special tower 

 or shaft constructed of incombustible material as in the case of 

 stairways and elevators. Openings to such shafts should be 

 self-closing. 



Page fourteen 



