Masonry Magazine April 1967 Page. 9
Do something
to insulate cavity and block walls. Use jawbreakers, maybe.
Did your engineering teacher firmly believe that cavity and block walls didn't need insulation because of the "dead" air space? Was he peculiar in any other way? Because whenever the temperature differs on the inside and outside of these walls (that's all the time), convection occurs in the cavities. The more different the temperature, the bigger the wind in the voids. The wind carries therms from the side where you want them to the side where you don't. These walls are as good as-or better than other kinds of walls. But like all walls, they need insulation. Without it, the occupants are as miserable as the heating and air conditioning bills. If the cavities were filled with lint, jawbreakers, cracker crumbs-anything-it would make the situation somewhat better.
Zonolite Masonry Fill Insulation:
better than everything
Zonolite Masonry Fill Insulation was developed specifically for these kinds of walls. It doubles their insulation value; a real boon to mankind. Keeps inside wall temperatures comfortable and the heating and air conditioning bills easy to take.
Zonolite pours right into the voids, fills them completely, never settles. It is water repellent; any moisture that gets into the wall drains down through it and out. Cost: as low as 10é per square foot, installed. Which is a boon to architects, engineers, and contractors, as well as mankind in general. Next time, specify Zonolite Masonry Fill; the insulation that's already proved effective in thousands of buildings.
CRACE
Gentlemen:
Zonolite Division, W. R. Grace & Co.
135 S. LaSalle St., Chicago, III. 60603 M 167
Somehow using jawbreakers or lint doesn't sound like a good solution to the problem of insulating masonry walls. Send me Zonolite Masonry Fill Insulation Folder No. MF-83, with complete technical data and specifications.
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