Roofing question

[DaveNay]

This is what the shingles look like....good reason to be replacing them, eh? /forums/images/graemlins/tongue.gif

Dave

 

[Bird]

Yeah, it does appear that it might have been a little past time for a new roof. /forums/images/graemlins/wink.gif

 

[slowrev]

Dave,
I would replace just the bad areas of sheathing. Even if you just put OSB over it you will still have to replace all the bad edge sheathing boards. And thin OSB will not hold nails as good as 3/4 sheathing. Use drip edge as well.

I am not a roofing expert, but I did stay at a holiday inn /forums/images/graemlins/smile.gif
Actually I have done several roofs working with experts.
Use the 20LB (or is it 30 lb) felt under the shingles, it lasts better and does not rip loose as easy as the 15lb stuff when you are putting the shingles on top of it. Ripping felt can give you a wild ride off the roof /forums/images/graemlins/shocked.gif

Ben

 

[Cliff_Johns]

Dave,
I think you need to replace rotted sections rather than sheath over it. The reason is weight. It may not seem like much weight, but roofs are designed to hold three layers of shingles and a snow load. Think about how much a whole extra layer of compressed wood would weigh. In any case, I think you would have trouble attaching it well.

Also, when you open the really rotten sections, you may find that you need to sister some rafter tails to the existing ends if the rafters are also rotted, which by the looks of your pictures, I think a couple may be.

Cliff

 

[gsganzer]

I'd think you'd just need to fix up the bad spots. I'd rip some new "boards" from some 3/4" plywood and just replace the existing boards that are damaged. The plywood is cheaper then dimensional lumber, hold nails better then OSB or dimensional and won't swell as bad as OSB if it gets wet from a leak. I'm not a big fan of OSB for decking applications. I don't mind using it for sheathing.

 

[ByronBob]

Where are the soffit vents? You need air movement to help prevent moisture from trapping in the material.

If you plan on staying there for a long time I'd replace everything. Because under the rot do you know the trusses are soild? When I did my house it became apparent that doing the whole thing from scratch was the best solution.

I'm not a roofing expert but IMO you'd be better off long term doing it over.

 

[gsxr1100]

soffit's are along the side. Stand near the side of the house and then look up toward the roof. Where the overhang is there are holes in the siding (for example). That is the soffit's.

 

[gsxr1100]

Dave,
I feel for ya. I did my 2 layer removel last Sept. Boy, did that suck. I also had the same roofing boards (old school) and the same roofing shovel as you!

My old man (285 lbs) was walking and and breaking the boards as fast as I could replace them with 1" plywood! Nevermind the 7" drip edges I needed and the fire and water stuff from ****!

God, I hate roofs. Next roof is all metal... /forums/images/graemlins/grin.gif

 

[ByronBob]

Oh yea,

Make sure you put water and ice shield on the ends and in the valleys. These are places that catch the water the most.

 

[DaveNay]

Well....upn further review of the play on the field, the call is reversed. As I have exposed more of the boards, the rot has become worse (even to the point of being careful where I step....I'm 6'3" 280 lbs also /forums/images/graemlins/shocked.gif) I now intend to remove all the boards and replace them with OSB. I'm not going to get into the debate between OSB and plywood, as the OSB is what has been delivered already /forums/images/graemlins/tongue.gif. gsxr1100, whoever invented that roofing shovel was a genius. I keep switching between it and a garden pitchfork. I am being less careful to remove nails now, as I am going to be pulling up the boards. A far as ventilation goes, that was pretty much an unheard of concept when this house was built. There are a couple of gable vents, and that's it. I am going to be installing the continuous ridge vent, and the drilling holes in the soffit (little louvered aluminum vents fit into these). The roof I am replacing is on the "new" part of the house...built in the 1920's. Believe it or not, the roof on the oldest parts is still original cement board (probably asbestos like the side walls). It has held up way better than the asphalt shingles (2 or three layers are coming off).

Cliff....always an optimist aren't you?! /forums/images/graemlins/crazy.gif Oh well, I think you might be right that one or two refters are a little soft as well. I'll find out sometime tomorrow.

Dave