Masonry Magazine April 1968 Page. 27
PEANUT BUTTER
The "dead" air space in brick cavity and block walls is very much alive. Whenever the temperature differs on the inside and outside of a wall (that's always), convection currents in the cavities shuttle therms from the side where you want them to the side where you don't. A masonry wall filled with anything—peanut butter, strawberry jam or dirty shirts—is better insulated than a wall filled with nothing but air.
Anything in the wall is better than nothing at all
Now read about the masonry insulation that often doubles insulating value and fire ratings.
Zonolite® Masonry Fill Insulation was developed specifically for concrete block or brick cavity walls. By doubling their insulating value, it keeps the occupants much more comfortable and cuts heating and air conditioning bills as well.
Fire ratings can double, too. An 8" lightweight block wall rated at two hours gets a four-hour rating when insulated with Zonolite Masonry Fill. Particularly important in party walls, elevator shafts and stairwell walls. In addition, Zonolite Masonry Fill cuts sound transmission. All for as little as 10¢ per sq. ft., installed.
There is simply no other way to build a masonry wall that blocks thermal and sound transmission so well, increases fire safety so much, and does it at such low cost. For complete information, mail the coupon.
GRACE Zonolite Division, W. R. Grace & Co., Dept. 000 Merchandise Mart Plaza, Chicago, Ill. 60654
Gentlemen: Much as I like peanut butter, it doesn't seem to do much more for a wall other than insulate it better than air. Please send me Zonolite Masonry Fill Insulation folder which contains complete technical data and specifications.
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