underlayment on a go-over ?

Out here in Oregon you are allowed to have three roof coverings on a home before you have to tear down all the way to the sheathing with the exceptions that with each of the second and third roof coverings-the shingles and roof deck that you are replacing with another covering, must, be in good condition with no excessive loss of roof granules on the shingles and no rot on the sheathing.>>>

I saw the neighbor had Side Job Bob doing it a couple of summers ago. i didn't see any new flashing going into the sidewall, but the field had I&W between the layers.

I'm sure they got a good "price" from Bob :laugh:>>>

We used to do them when they were organic. Could stick them with 2 nails and they would stay. ( I speak from seeing 15 year shingles going 20 years, nailed like that, NOT doing it). :)>>>

T-lock, I am in Boston and you can add a second layer but not a third. I laugh when I see this silliness. I think I & W shield and or paper on a go over is NUTS>>>

tinner I understand what ur sayin (dont agree) but what about the amount of heat between the roof and in the attic space ? This I think would cause the 30 year shingle to age quicker. Never had a complaint with a new roof. Go-over or rip-off.>>>

Lay overs are a thing of the past here. Use to be able to have up to 3 layers on a house. City code now is 1, plus most insurance companies want just 1 layer on the house. To many voids between layers for hail to go through. What good is the I & W sheild gonna do stuck to shingles?>>>

It's a good idea if you want to re-roof the same house in 5 years. Without felt, the 30 year shingles should be good for 12 years. Tear off and the 30's should be good for 22-25 years.>>>