HOUSING AND HYGIENE 275 



Such a wall as this will meet the reciuirements of most 

 climates and will be dry. The greatest difficult}' from 

 moisture gathering on the walls usually comes from dead air 

 spaces in the walls that are double boarded. During the night 

 the air between the boards becomes cool. In the morning 

 when the sun pours into the pen it warms it faster than it 

 does the air shut in between the boards. The result is that 

 the wall on the north side in particular will he cooler than 

 the air of the pen and will condense the moisture from it. 



I'lQ. MS 





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A perinauent farm poultry house, with slatted front and scratching basement. 

 (Courtes3^ of Missouri State Poultry Experiment Station.} 



Roofing Materials. — The so-called "prepared roofing" is 

 the material most widely used f(ir poultry house roofs. It 

 has the advantages of being reasonable in price, and draft- 

 proof, as well as moisture-proof. It fins the disadvantages of 

 drawing heat Ijadly when placed on a south slope, luiless it 

 is painted white, and of ripping in se^'ere \\ind storms, imlcss 

 cleated down witli wooden strips. 



The Straw Loft. — One means of helping to keep the poultry- 

 house dry is the straw loft. A loft is built just under the roof;, 



