40 



HOW TO BUILD A SILO. 



enough but that some air may arise between the two sheets 

 where they overlap, and thus gain access to the silage. It would 

 be an excellent precaution to take to tack down closely with 

 small carpet tacks the edges of the paper where they overlap, and 

 if this is done a lap of 4 inches will be sufficient. 



The first layer of lining should be put on with 8-penny nails, 

 two in each board and stud, and the second or inner layer with 

 10-penny nails, the fundamental object being to draw the two 

 layers of boards as closely together as possible. 



Such a lining as this will be very durable because the paper 

 will keep all the lumber dry except the inner layer of half-inch 

 boards, and this will be kept wet by the paper and silage until 

 empty, and then the small thickness of wood will dry too quickly 

 to permit rotting to set in. 



A still more substantial lining of the same type may be se- 

 cured by using two layers of paper between three layers of boards, 

 as represented in Fig. 3, and if the climate is not extremely severe, 

 or if the silo is only to be fed from in the summer, it would 

 be better to d'o away with the layer of sheeting and paper outside, 

 putting on the inside, thus securing two layers of paper and three 

 layers of boards for the lining with the equivalent of only 2 inches 

 of lumber. 



The Silo Roof. Roofs on silos make big savings in keeping 

 the silage from drying out and blowing around. They keep 



Pig. 9. Showing construction and details of one style of roof. 

 (From Nebr. Bui. No. 138.) 



