I’m looking for advice on how DIY-friendly dense pack Johns Manville Spider insulation is compared to dense pack cellulose for a 12″ wide wall in a cold climate? In other threads —
— GBA advisor Michael Chandler has made the case that dense pack Spider insulation could be as good as or even better than cellulose (at least in a North Carolina climate). What was unclear to me from reading these threads was whether dense pack Spider insulation (not the glue-added variety) could be purchased and installed by a homeowner? Can dense pack Spider insulation be blown in by the type of blowers available at Lowes and Home Depot? It appears that dense packed Spider is less dense than dense pack cellulose (2.2 lbs / cu ft vs 3.5 to 4.0 lbs/cu ft) Does the lower density also mean less pressure is needed to install it properly?
Somewhere in the above threads someone stated that the insulative or air infiltration-blocking abilities of Spider insulation were overstated by Johns Manville. Does anyone know of independent analysis of Spider insulation? I also understand that typical fiberglass insulation has a decreased R-factor at lower temperatures. Is this true for Spider insulation as well? If so, by how much?