Cellulose – Type 1 vs. Type 2 vs. Damp Spray?
I’ve done a bit of searching and have not found much solid information to go on. Cold end of Climate Zone 6A, Ottawa ON, high humidity. Building 12″ thick double stud dense pack walls + 2×3 service cavity, ~R80 attic blown in.
I’m speaking with a sales rep from ThermoCell insulation, a Canadian manufacturer of cellulose insulation with a manufacturing plant less than an hour from our build. He is quoting me their Type 1 ProCell Green product for use as both blown-in attic and dense-pack wall insulation.
Here is a link to their product information for all three types of product they offer:
According to the sales rep:
ProCell Green (Type1): Has an oil additive to help control dust
ProCell Blue (Type 2): All borate, prevents mold and mildew, rodent deterrant
ProCell Gold (Type 2): Not available in Canada, 6 mil vapor barrier traps moisture of the damp spray product
According to the brochure linked to above the Blue has about 7% better coverage (fluffier, less compacted maybe?), and according to the sales rep the Blue has all borate with no oil additive (better mold/mildew resistance, better fire retardant, more vermin resistant?).
Does anyone have any insight as to which product would perform better? Would the oil additive be insignificant as far as performance goes and offer meaningful ease of installation and dust reduction?
Also, since I plan on using a variable permeability vapor barrier (Membrain or similar), would the wall drying be an issue? The insulation will be completed before the interior non load bearing walls are done, so the walls will have lots of drying time before getting “sealed” up.
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Replies
My last paragraph was referring to the use of the ProCell Gold in a damp spray application, if that were made available as an option.
Lance,
It looks like you want to use ProCell Blue, for two reasons: (1) It's an all-borate product (meaning it uses the preferred fire retardant/pest repellent -- borate), and (2) It's described in the brochure as "specially formulated ... for ... easy installation and long-term performance in attics, walls, ceilings and floors. It provides exceptional density."
Thanks Martin, that's what I was thinking as well. I wanted a second opinion before I questioned the sales guy's recommendation.
Is damp spray generally not recommended for a 12" deep installation?
Lance,
Q. "Is damp spray generally not recommended for a 12-inch-deep installation?"
A. I've certainly never heard of damp spray being used in a double-stud wall -- and I wouldn't recommend it.