Masonry Magazine December 1968 Page. 9
We wish it was dead. But the air space in masonry walls is like Frankenstein's monster. Even when it's sealed up it's alive and full of the devil. Whenever the temperature differs on the inside and outside of a wall (that's always), convection currents in the cavities carry BTU's from the side where you want them to the side where you don't. A masonry wall filled with salami, beef stroganoff or anything is better insulated than a wall filled with nothing.
Anything in the wall is better than nothing at all.
Here's news about a special insulation that doubles insulating values, increases masonry fire ratings, too.
The name is Zonolite Masonry Fill Insulation. Perhaps you already know that it doubles the insulating values of concrete block, brick cavity and brick-and-block walls. Which keeps the occupants more comfortable, cuts the heating and air conditioning bills as well.
But the big news is that it can double the fire ratings of an 8-inch lightweight block wall.
A 2-hour rated block wall gets a 4-hour rating when insulated with Zonolite Masonry Fill. Particularly important in perimeter, party and stairwell walls and elevator shafts.
For extras, we throw in the fact that Zonolite Masonry Fill cuts sound transmission, too.
All for as little as 10c per square foot, installed. There simply is no other way to combine high insulating value, sound reduction and fire safety in a masonry wall at such low cost.
For complete information, mail the coupon.
GRACE Zonolite Div., W. R. Grace & Co., Dept. 000
Merchandise Mart Plaza, Chicago, III. 60654
Gentlemen: I like salami (especially with a little mustard) but I think it's a little rich for masonry walls. Please send me latest Zonolite Masonry Fill Insulation publication with complete technical data and specifications.
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