[quote=“TucsonAZ”]This is a very simple home, one main load barring wall down the center of a roughly 30x30 home with 18 foot exposed 4x8s at about 20 inch centers. There is a slight pitch, I’m guessing 1 inch per foot. The current roof is so goofy, it’s about 5 sheets of press board covered with some tar paper and roof coating. It leaks like hell!
So I’m going to pull the whole roof off down to the 4x8s. What should I do from there?
My only thought was since I’ll need sheetrock for the ceiling I could do the whole roof from the top with rock, nail 2x2s down the 4x8 beams, put foam in the spaces, cover with 3/4 t&g followed by some tar paper and a roof coating. I have some corrugated tin laying around so I could follow up with that.
My main worry is I want the most energy efficiency I can find so I don’t think the above will give me an r_rating over 10 and I would like to double that as Tucson is hot and the sun is a killer![/quote]
Don’t do any of that.
What did you do? get your advice from a
"home inspector", “roof inspector”,
I haven’t met one yet that had a clue…
Call several state licensed Roofing contractors.
They are the only ones that are qualified to “consult”
You don’t have 5 sheets of pressboard…
You have a product called homasote.
I might be spelling it wrong.
Its 2 1/8 inches thick.( it does swell and looks much thicker when exposed to a roof leak)
A 2x8 foot tongue and groove product
(yes, its pressboard inside of it) that is the ceiling and the roof. Do not tear it down. Order the boards you need to be delivered with your roofing system.
You have to take one board partly up to replace the bad board next to it because of the tongue and groove. you will understand once you get into it.
You can fix more than one area with one board.
remove the roofing while being careful to save the homasote. replace really dipped boards. Slightly dipped can be fixed with the roofing.
You’ll understand once you buy the boards and start trying to replacing them.
I would suggest certainteed black diamond
peel n seal underlayment.
Then install smooth certainteed modified torch.
Then install granulated certainteed modified torch.
You need an experienced professional for this job.