Masonry Magazine November 2002 Page. 33
The application techniques
The application techniques used on the job will vary, based on the specific job and the individual installer. The three different application techniques are: drill and fill, top fill, and trowel-in-place.
the foam is installed, and its rejection of moisture, helps maintain a dry wall system that discourages these problems. An added benefit of foams is that they are autosterile and bactericidal, resisting attack from fungi and aerobes.
Application and use
AS A CAVITY-FILL INSULATION, the finished product has no structural strength and will not bond to surfaces. It is applied under air pressure allowing it to flow as a semi-liquid filling all nooks and crannies that could otherwise contribute to excessive heat loss. With a high R-value and a relatively low cost, foams when applied properly can be a wonderfully practical addition to masonry walls.
But the problem is, most masons, general contractors, architects or owners don't know if it is being properly applied. There 5/8" holes are drilled in the mortar joints so the foam can be injected into the cells. There are some very clearly defined procedures required by every manufacturer for the effective application of foams. When new installers are trained, these procedures are universally recommended when it comes to making the finished product at the job site. These procedures should be followed on every job, every day:
* Equipment should be adjusted to assure the correct ratios of the chemicals.
* Samples should be weighed to determine the correct density.
* Setting time should be determined before starting installation.
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The Voice of the Mason Contractor
November 2002 Masonry 31