122 PRINCIPLES OF POULTRY-HOUSE CONSTRUCTION 
When made, light-weight muslin should be used, canvas being 
too heavy and cheesecloth too light. At best a great deal of, 
dust is present in the poultry house, which requires that these 
muslin curtains be beaten or swept occasionally to clean them so 
the air can pass through freely. Too large or too long frames are 
objectionable, as they get out of shape easily and give trouble in 
raising and lowering them. 
— ere A frame about 4 x 5 feet 
HZ | NX is a very convenient size 
(Fig. 78). A glass sash is 
sometimes placed in the 
I centre of the frame so that, 
y/ CXS when the curtain is down 
N /\ onstormy days, sunlight can 
get into the house—if there 
) 9 is no other glass window. 
Nw y 4 Material for Roofing.— 
Sa es a ee The material used to cover 
the roof depends almost 
entirely upon the angle or 
pitch. A roof with less than 
one-third pitch should not 
be covered with shingles, as 
the water does not run off 
“J 
| quickly and the roof will rot. 
7 \ x 
A driving rain is apt to run 
under the shingles and cause 
the roof to leak. A good 
= Se 
\ grade of roofing paper may 
UN A\\ be used, as it is much 
Se ee cheaper and if properly cared 
Fia. 78.—Two plans for constructing frames for for is as durable as shingles. 
muslin curtains. Such paper can be used on 
roofs which are nearly flat. 
A roof with low pitch and tight paper is warmer in summer 
and also warmer in winter than a shingle roof. It can be made 
cooler in the summer by providing ample ventilation from the rear 
over the roosts (Fig. 67). 
Care of Poultry Buildings.—It is a policy of economy to care- 
fully care for poultry houses and attempt to increase the length 
of their usefulness. This care should consist of keeping the houses in 
