G6 FARM BUILDINGS IN SOUTH AFRICA 



case, consists of pieces of roof ridging inverted, though it is often 

 formed of plain galvanised iron bent to shape. 



The intersection of the roof slopes at the end of a hipped roof is 

 arranged similarly, the valley rafter being replaced by what is known 

 as a hip rafter (also 9" by 1$"). The jack rafters in this case run from 

 the hip rafter to the walls, as indicated in Fig. 49. 



The two roof slopes which meet at a hip rafter are capped by roof 

 ridging which is screwed, along with the roofing plates, to two purlins 

 (HP, Fig. 67) running parallel to, and one on each side of, the hip 

 rafter HE. In the case of the roofs shown in this figure the short 

 lengths of hip rafter, HE, are rendered necessary on account of the 

 ridge of one of the roofs being higher than that of the other. 



Roofs for Square and Circular Buildings. — Examples of these will 

 be found in Chapters XIX. and XX., which deal with silos. 



