Masonry Magazine March 1970 Page. 23
Outside heat raises inside cooling costs.
Zonolite can help reduce the problem at its foundation.
Look into Grace-Zonolite® Masonry Fill Insulation. It's incredible stuff. To put it another way, it's a lightweight, free-flowing, water-repellent, vermin proof, rot-proof, fire-proof, sound-deadening, inorganic, granular vermiculite! Year after year, it can deliver savings in cooling and heating dollars that far exceed the initial cost of the fill.
Other virtues? Yep. Zonolite Masonry Fill Insulation reduces sound transmission 20% to 31%. It increases a 2-hour fire rating to 4. It pours in at the rate of 28 square feet per minute. It's acceptable in FHA-financed housing.
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"U" VALUES-concrete block walls
Block Only
Uninsulated
Wall
Thickness,
Inches
Type
of
Block
6
Lightweight 40 26
Lightweight 33 .17
8
12
Heavyweight 53
Lightweight 33 12
Heavyweight .46 25
36
ZONOLITE
W. R. GRACE & CO.
62 Whittemore Avenue
Cambridge, Mass. 02140
GRACE
Just say Grace.