80 FARM BUILDINGS IN SOUTH AFRICA 



In order to key-in the brickwork a ^-inch square key strip of 

 wood is nailed up the side of each post, so as to be situated in the 

 middle of the thickness of the brickwork lining. The ends of the 

 bricks next the posts are notched to receive this key-strip. Key-strips 

 are not necessary on horizontals ; on the other hand, they are extremely 

 useful on door-posts where the slamming of the door tends to shake 

 the brickwork loose. 



The bricks are laid so that the resulting brickwork surface is 

 flush with the inner edges of the scantlings composing the timber 

 framework. 



Since the brickwork is not exposed to the weather inferior burned 

 bricks, or even sun-dried bricks, may be used. 



If burned bricks are used they should be laid in lime mortar, 

 and the inside rendering of the walls should be done in lime plaster. 



Sun-dried bricks, if used, would of course be laid in dagga, and this 

 material would also be used for the plaster. 



In order to hold the plaster to those surfaces of the wood framing 

 with which it comes in contact, any one of the following methods may 

 be employed : — 



1. The surfaces in question are studded with flat-headed nails 



which are left projecting slightly. 



2. The timbers are cut into in a downward direction with a chisel, 



so as to form slightly projecting tags of wood all over the 

 surface to which the plaster can adhere. Evidently this 

 will not be satisfactory in the case of horizontals, for which 

 Method 1 might be employed. 



3. Strips of rough metal mesh-work, which are made and sold 



for the purpose, are nailed on to the wood faces. This 

 forms an excellent grip for the plaster, and is the best 

 device of the three which have been mentioned. 



Examples of Wood-and-iron Construction. 



Implement Shed. — The framing for an implement shed 30 feet long 

 by 14 feet 6 inches wide is shown in Fig. 86. 



The clear height, from the ground to the lower edge of the front 

 roof-plate, is 9 feet. The rear roof-plate is 18 inches lower than this, 

 thus giving the necessary slope to the roof. 



