After many months of installation, plus some time off for a retirement trip and family visiting, the rock wool mostly got installed. Of course these oversize pillows make a large difference in the house being able to hold its passive solar heat and it is cozy inside again. The temporary electric heaters ran the electricity bill up to over $300 one month, but that is better than freezing pipes.
True to the hype, this insulation was very much easier to install than fiberglass batts. It is still dusty and a mask is still a good idea, but it does not cling to the skin and itch like crazy for weeks afterward. Actually my brother-in-law, a contractor, told us to use baby powder before working with fiberglass and it really did help to keep the stuff from clinging, as long as sweat didn’t wash the powder away.
It appears that I over ordered by quite some amount of the 24″ stuff. I suspect that I doubled the ceiling twice as we have about 30 bales too many. When I was figuring linear feet of ceiling, I may have doubled the amount for two layers of 5.5 inch Roxul, then when the order was complete, I doubled the number of rolls to account for the double layer. At least that is what I think I did.
UPDATE: I double checked my figures for the insulation in the ceiling and I did not double the measurement twice. I did add 10% and that should have resulted in 9 more bales of the 23″ size. I don’t know how many rolls were delivered when it came, my son-in-law just stacked the delivery inside and we never counted. They MAY have delivered more than I ordered.
The extra is in the way, but we have odds and ends to complete and have to figure out how and where the wiring will pierce the barrier, so some of the overage will be used. The rest will have to find another home.