buying shingles next week, before i do......

seeyou

To the OP:

I haven't read deeply enough to discern whether you've already purchased your OSB or not. If not, try to find Advantech by Huber. It's a few more dollars per sheet, but vastly superior to regular OSB and most plywood that I see for roof sheathing. It's denser and has much better nail holding ability.

OTOH, 7/16" OSB on 24" ctrs meets code in most areas. I don't like it, but I see it on multi-million dollar homes. It will be adequate if installed with clips and nailed properly.

The blocking some of the earlier posters are referring to is adding a 22 1/2" 2x4 between the trusses at the joints in the OSB. Probably little gain for the amount of effort. Use "H" clips between each truss instead. And most of all, be careful up there and don't bite off more than you can chew. Tear off one area, re-sheath and dry-in. Then take off another section and get it dried in. Nothing worse than running out of daylight and energy with an open roof.

racebum

doing exactly that. the roof venting only had 7 small canisters on the entire house. i'm installing ridge vent the whole way across along with a larger side vent in an area that i'm replacing the siding. i'll host a few more pics over the weekend of the tear off and what i run into.

also, i agree with the old sheathing removal in sections. it just seems easier to pull a few, nail a few. i've heard of some guys pulling entire sides but it seems risky in oregon when there are chances of shower and just the dew you would get over night with an open deck

racebum

progress today...step brother jason pictured, lordy was the help handy ! we started at 2pm and finished half the house in 6hrs. both layers peeled up pretty easy. one part i found amazing was how well the soaked osb held up. also noticed a lot of moisture under the tar paper of the shingle over.

seeyou

There's usually moisture between the layers, but I don't think I've ever seen felt between the layers on a layover. That may have aggravated it. Glad your progress was good.

racebum

oh, and about this. we're using clips and making sure the sheet fall on the truss. nothing seems worse than a big unsupported mass hanging way off a 2x4. my friend was also telling me that we should avoid cutting any sheet smaller than 24" it makes sense too. on the current deck the very worst pieces are the small cuts on top. larger wood has the ability to take on more nails, support itself etc. as for the osb, i picked up a bundle of that LP osb, orange side, white stripe. $9.69 a sheet is why. i considered tracking down the stuff you mention, it's just that spending more is something that would shoot me right over to 3/4" cdx. had i been able to swing it that's what i would have chosen. i have no idea why but the 5/8 and 3/4 cdx is superior in construction to the 1/2. a lot of the 1/2 i checked out was just rough, warped and really light. this 7/16 osb i now have weighs at least a few lbs more per sheet than the 1/2 cdx i picked up. maybe it's just an odd run? who knows.