204 Bulletin 274. 



feet farther around Fig. 36-^ than it is around Fig. 36-£, which has 

 same number of square feet floor space. If the sides of the house are 6 

 feet high, then one thickness of boards would take 6 times 72 or 432 

 square feet. If the house is double-boarded it would be twice as great, 

 i. e., 864 square feet, besides the extra material required for 72 feet of 

 framework, building-paper, nails, labor, foundation, etc. The long, nar- 

 row house is colder because it has 432 square feet more of exposed sur- 

 face than house E having the same floor space. Similarly it will be found 

 in comparing Fig. 36-^ with Fig. 36-F that there is a still greater saving, 

 and that in comparing Fig. 36-/^ with Fig. 36-H, which has the smallest 

 possible area for a given square foot floor space (450 sq. ft.), the dis- 

 tance around Fig. 36-^ is 87 feet greater than around Fig. 36-//. There 

 would be also the same relative increase in the square feet wall surface 

 exposed to the cold and the extra cost of building the walls in Fig. 36-// 

 as compared with the other types of houses. 



The form of the roof 



The roof is the most expensive part of a poultry house, because, as a 

 rule, it covers only one floor and must be made water-tight. The style 

 of roof greatly influences the cost. It takes the same amount of material, 

 however, to build a gable roof, a one-slope roof, or a combination roof, 

 if the pitch and the ground plan are similar (Fig. 37). The shape of 

 the roof determines the height of the sides and likewise the cost of 

 the structure. If we assume that the window is 6 feet high in a building 

 15 feet wide, it would be necessary with a gable roof to have both sides 

 of the house the same height. This makes more interior air space than 

 is necessary and requires that the rear wall be 13^ feet higher than would 

 be needed with a one-slope, or combination roof. A one-slope roof will 

 necessitate extra lumber to build 6 feet higher in front than is required 

 by the combination house. (Figs. 37 and 38.) If an alleyway is 

 required along the back of the house, or if a large garret space is desired, 

 the gable- roof house will be the most economical to build. (Figs. 35 

 to 40.) 



If these three styles of houses were built so that each required the 

 same amount of material, having the same pitch of roof and the same 

 floor space, they would be as represented in Fig. 39. This makes the 

 one-pitch or one-slope roof too low in the rear for convenience. 



The steeper the pitch, the greater the comparative expense of a shed- 

 roof house over the gable or combination-roof house. The steeper the 

 roof the larger the roof area, hence the greater cost for roofing and the 

 longer the roofing will last because of its steeper pitch. Most roofs can 



