Roof problems

Last October I had a roof replaced on my ranch style house. There was lots of delaminated plywood due to some inadequate venting. I advised the contractor to replace as much as would be required to do the job properly. The proper venting was installed at that time as well. I was recently up on my roof and noticed 6 soft spots and one very soft spot. A quick check in the attic confirmed that it was all old plywood not the new. My questions are if the wood is bad today wouldn't have been bad or at least questionable 10 months ago? Also what is the best course of action next? Rip off entire roof? Repair the half dozen spots? Thank you.

 

Yes, the plywood would have been soft 10 months ago, but apparently the roofer thought that it was solid enough to hold the roofing nails.
Do not rip off the roof.
Repair the roof from within the attic with 2X4 or 2X6 perlines nailed between the roof rafters to shore up the "soft" spots.
Good Luck!
Mike

 

So I am to assume that these perlines made up of 2x4 or 2x6 from inside the attic will remedy my soft spots and offer proper snow load weight bearing capabilities? For the next 15-20 years?Why do you suggest not ripping off the roof? Thanks for the reply.
If I decide to go with the perlines-do I install the 1x part towards the sheathing or the thicker 4x or 6x towards the sheathing? Spacing?

 

Unless the plywood is completely dry-rotted and can't be supported, the perlines should support any snow load on it that a roof rafter will.
As long as the plywood will hold the shingle nails, it should be alright until you reroof, if it has additional structural support.
Take a screwdriver or knife point and poke around on the "soft" spot areas. If it penetrates easily and flakes the plywood, then you may have more of a problem than I guessed. If it doesn't penetrate the plywood easily, it will probably be o.k.
I can't see it, so you'll have to make your call about reroofing, or get a licensed contractor in to inspect it for you and give you hands-on advice.
Hard to imagine a pro roofer shingling over rotted plywood, when he had your authorization to replace it if he thought it necessary.
Good luck!
Mike

 

My next question is how should I handle this with the contractor? I know that there are contractors on this board, how would you guys handle this situation? Also if I go the reinforcing method what is the best installation procedure? spacing? nailing? screwing? What irks me is the fact that I gave him carte blanche to replace as many boards as needed. Now I have to settle for a finger in the dyke fix. I would assume the only real correct way is to strip my 10 month old roof and start from scratch.