NESTING OF HOUSES. 19 
wide houses, to treat the building as a shed, and to take 
extra care in making the roof strong and tight. 
A single house, standing by itself, is always more difficult 
and expensive to heat and to manage than a range of houses. 
It is, therefore, very important that houses should not only 
be heated, so far as possible, from one central system, but 
. also that the houses should lie alongside of each other so 
that the interior walls may answer for two houses, and that 
one house may protect another from sweeping winds. For 
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4. A broken roof on the level, 18 feet wide, with sloping 
center bench. 
purposes of convenience in repairing the roof, and to avoid 
injury by snow, it is better to have these parallel houses 
separated from each other by a space or alley of two or 
three feet; but inasmuch as this doubles the number of 
walls and exposes every wall to the weather, this method 
of construction is rarely used for small houses in this 
country. Two contiguous houses are allowed to rest upon 
a common wall, but the gutter between the two is made 
deep and wide so that the water may be carried off quickly, 
and a workman may walk through it when repairing or 
painting the roof. In the case of very large houses, how- 
ever (say those 35 ft. or more wide and 200 ft. or more. 
3 FORC. 
