Originally Posted by spdorsey
I live in California. Thanks for the replies!
As Joe's map shows, California has five different zones in it.
I live in Zone 3 and have R19, because that's what the house came with. Might be nice to have more, but first I need to air seal the attic before it will do much good. But nearly everybody around here has the same thing.
Which begs the question, how airtight is this "lean-to"? If you have a drafty door and leaky walls/windows, going to the full recommended R value is not going to be good value.
And how are you calculating $1000 for an 18x9 roof? That's 162 square feet. Both of the R38 batts advertised on the HD site are exactly $1 per square foot.
This one is 64 square feet, look at the specs