R15 fiberglass insulation, does it exist
I can not figure this out, and am hoping for some insight. With the push to be more energy consciences why is R-15 fiber glass not on every Lumber yard-Box store shelf?
I have used it in the past and we could get into a whole argument as to other types are better ie. spray foam etc. But from a fiberglass to fiberglass standpoint isn't R-15 better then R-11 or R-13.
Is cost per square foot that much more it is not viable, and if it is cost does it come down to economics of scale alone, more 13 is made so it is cheaper? Lowes in my area a long time ago had it in stock, and for a brief time before Christmas HD had it but I did not need it when I went back the next week it was gone. I am always told "we can special order it".
Do you find it in your area? Do you use it? I find that since it is so dense it is easier to cut install etc. If any one is in the manufacturing end of it your insight is greatly appreciated.