CONSTRUCTION AND "FIRE PROTECTION OF COTTON WAREHOUSES. 53 
figure 2 of this drawing. The width of the part of the T that 
forms a section of the exterior wall should be 6 feet. Only very 
exceptional conditions demand the increase of this length. If a 
wooden platform is used the portion of the platform adjacent 
to the T of the division wall should be of concrete. This may be 
a paved section supported by low wall and earth fill or it may be of 
reinforced concrete. The exterior wall shown by figure 1 forms 
fully as good a fire break as the T wall and is much cheaper in 
construction. If the platform is of wood it should be broken at 
the division fire wall by a paved section 6 feet or more in length 
as shown by the drawing. The extension wall itself should project 
3 feet beyond the frame or tile exterior wall. Such extensions should 
not be counted in the length of the wall for determination of ex- 
cessive length as effecting thickness. Neither is it necessary that 
the required wall thickness be used for this portion of the wall, as 
12 inches is satisfactory. For either design the top of the division 
wall, including the extension or T section, should extend 3 feet 
above the roof and should be finished with a coping as described 
under " Slow-burning construction." As in that instance, the para- 
pet should be 12 inches thick, this same thickness being used for 
the T wall or the extension for any reasonable height of wall. 
The same factors governing preferred designs are to be found 
here that were pointed out in the discussion of slow-burning con- 
struction. The features of compartment size and number of stories 
are the same. The use of concrete platforms is even more im- 
portant than in the former case. The exterior wall should be of 
light framing weatherboarded and should provide sliding wooden 
doors. Thin tile curtain walls may be used to good advantage, but 
do not justify a very great increase in cost over the frame. Divi- 
sion fire walls may terminate in either manner described. The T 
wall costs more but is an advantage if platforms are narrow. The 
projected extension wall affords fully as satisfactory protection. 
The roof of the eaves should extend over the wall about 12 inches. 
A hanging gutter is a very desirable finish. Wind anchors for 
roof timbers at exterior w T alls of frame are of little value, but if 
the exterior wall is of tile, suitable anchors of wrought iron should 
be provided at pilasters. Posts should be secured to roof framing. 
A good example of this semislow-burning construction adapted 
to trying conditions of the site is shown in Plate XXVIII, figure 1. 
Mere the basement is well drained and the floor waterproofed. The 
fire hazard incident to the wooden platforms is minimized by the 
fact that the platform is really detached from the building as shown 
in the detailed photograph (PL XXVIII, fig. 2). This view also 
shows the fire break formed by the division fire wall. 
