Really? That may change my mind about this. I am stuck between paying big dollars to have the whole thing sprayed. Or figuring out some DIY way to achieve a high quality job at a smaller price point. I would like to use the mooney wall concept to give myself at least 6 inches of insulation, and to break the thermal bridge for the entire roof structure. I guess maybe it wont be sealed 100 percent air tight but honestly who knows what condition the insulation is in the rest of the house and right now I dont want to figure it out. So even with an air tight second floor I am sure I'll still have a somewhat leaky house. If I went cellulose could I go unvented completely?
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