Masonry Magazine March 1963 Page. 19
and fuel oils has increased 2-1/2 times. Gas heating
Gas heating now cost 45 per cent more than the 1946-50 average. During the same period the rise in cost of electricity has about 11 per cent. The annual costs determined by this method are current. The annual savings achieved by insulation will therefore no doubt increase with time, again tending to make the savings computed for insulation by this method conservative.
The cost considerations mentioned above are variable with individual owners and the national economy. Their inclusion would therefore preclude a general solution.
re No. 1
Normal
Economic
Efficient
Heating:
Wall,
for
dow
re No. 2
Normal
Economic
Efficient
ing,
onry
s
ONRY
March, 1963
MF-32 Copyright 1900 Zonolite Co.
Printed in U.SA
MP-33 Copyright 1960 Zonolite Co.
Printed in U..A.
19