Masonry Magazine November 2011 Page. 22
AIR BARRIERS AND INSULATION
Class 1, 2, or 3. Class 1 is the best classification here, and this test also has a code-approved UL equal that does not add or take away from the Class 1 rating from ASTM.
ASTM E119. This is the fire test report that will show the hour rating for foam in a specific wall design with or without structural grout. No brand of CMU foam exists in the market place that can make a 2-hour CMU wall a 4-hour CMU wall without the help of structural grout or thicker-than-average CMU face shells. In fact, the grout and/or thicker face shells are the cause of the increased fire rating, not the foam. Be sure to view the specific wall design in the test and all the pages of the third-party testing. Don't just take sales literature claims as fact.
Proper installation
WHEN A FOAM INSTALLER is sub-contracted, the mason and the general contractor should have an idea of proper installation to insure complete fill, and to insure that the masonry is not harmed in any way. The only way foam could affect the look of the masonry is if the ratios are off, and the foam turns into more of a liquid than foam. This liquid, depending on which component is off ratio, could bleed out to leave a sticky, "wet" or stained look on the block. The installer should be inspecting for proper foam consistency in every cell, and noticing immediately if
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