What strategies are there to discover the inputs for manual J in an old house?
I think everyone who ever owned this house (climate zone 2, 1950) had a vendetta against building codes.
I’m not doing a major remodel, but the furnace and ducts need to be replaced. I’d like to do the calculations myself and see where that directs me. The issue is these manuals need a lot of inputs, which I simply don’t have. Sure, I could put a little hole in the wall and try to figure out the amount of insulation in there, but I wouldn’t be surprised if every wall was built in a different decade. Blower door doesn’t seem especially useful unless I can do it several times, which by my calculations is infinity dollars.
So I think what I am looking for is some sort of book on doing the detective/forensic work to figure out just what exactly is going on with this building. I don’t need perfection–this place will never, ever be perfect–but I would like to stay within a standard deviation instead of assuming wildly.
Oh, and virtually all contractors in my area are booked out for months, and charge at least double the national rate. Hooray for being a boomtown.
Does such a book exist?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part