PRACTICAL SILO CONSTRUCTION 55 



DOORS FOR THE SILO 



The usual size of silo door is 24x30", and in some 

 types of construction the height has been increased to 

 36 ". The door should be amply large so as to permit 

 the easy removal of the silage, yet if made too large 

 there will be a weak point in the wall by the exces- 

 sively large opening. For a door 24 x 30 " they should 

 be spaced 5 ' 6 " apart, center to center, on the wall 

 of silo, beginning at a point about 3 ' from the bot- 

 tom on a silo with floor at ground-level and about 

 18" above ground-level, on a silo where the floor is 

 below ground-level. 



At Fig. 13 is shown two types of silo doors. That 

 at a has a channel or groove molded upon the inside 

 of the silo wall, into which one side of the silo door 

 fits tightly. The door is built of an outer and inner 

 sheathing of tongued and grooved lumber, nailed to 

 4 or 6 cleats of 2x4" lumber, which are in length 

 equal to the width of the door. The door shown at 

 a fits tightly into the opening; and, with strips of tar 

 paper inserted around between door and frame, the 

 joint is made air-tight. 



The type of door shown at b (Fig. 13) is made of 

 the tongued and grooved lumber nailed to the 2x4" 

 cleats upon each side. This door is beveled upon all 

 four sides ; and when drawn tight with the bolt and 

 cross-bar, with strips of tar paper around same, the 

 joint cannot but be air-tight. Care should be used 

 to make the doors so that they fit perfectly, as other- 



