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Icynene is a liquid blown-in insulation. Since you have a balloon frame, they will probably go to the top floor and drill holes at the top of the wall. They will then pump this liquid down in the wall cavity. The nature of this product is that it begins to expand upward rather than outward, thus filling up the entire wall cavity.
Theoretically, it should fill every crack and crevice, thus eliminating any air infiltration into the house. Blown in insulation has a tendency to settle over time and not seal every nook and cranny. I do not know the R-value that is associated with this information, so that is something for you to look into. Icynene is a brand name of a company and here is the necessary information for you to do your research.
5805 Whittle Rd #10
Mississauga, ON LAZ 2JI Canada
800-758-7325 (Don't know if it is toll free)
Amazing what information is available at this site, eh! The eh is canadian lingo- might come in handy. If you do find the R-value I would appreciate the info... Good Luck.......
If I may be so bold, could you tell me what it is going to cost? and how big your home is? I have the same situation in my 1954 cape, and am looking to get an idea of the cost before I bother a sales rep.
I was curious if you had the work done, and if so, how do you like it.
I have been thinking about possibly doing the regular blown-in cellulose insulation, because I can do it myself, but your product still intrigues me
Thanks - TomR