underlayment on a go-over ?

I have seen more and more "roofers" using paper and ice & water shield on go-overs Is this common ? I have never once used paper or any underlayment on a go-over. Am I missing something ? >>>

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.>>>

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?>>>

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.>>>

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>>>

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). :)>>>

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:>>>

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.>>>

There you go!>>>

If I am correct, most manf. do not supply instructions for installion felt/I&W. A couple of manf. do write that they do not reccomend felt/ I&W to be installed on over-roofs/over-lays. We all know that the life span of shingles are lower when applied over and existing layer, most home owners that pay for this type of roof are quick sellers or financially strapped H/O's

The most popular reason I here why the felt is used is because it will help the shingle keep a straight course. I CAN KEEP A STRAIGHT COURSE JUST BY USING THE GAUGE ON MY NAILER! Other that, I see no reason to use the felt, maybe I will find out when it comes my turn to tear one of those roofs off!

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I thought the whole purpose of nailing over was for a cheap job. Doesn't all this unnecessary stuff kill the purpose?>>>

Would like to debate need for a nailed base sheet when redoing a BUR. Direct attachment to an old roof w/ asphalt would mean that you would inherit any and all the deficiences of the old roof; whereas, by nailing thru the original, you would be venting any gases or moisture entrapped in old system. What say you.>>>

In FL, two layers are allowed but they just don't work. In addition, if the home goes up for sale, the lender will usually not lend on a "go-over" and the roof will have to be removed anyway.

I have only sold ONE in many years of roofing-- on a barn. I can't see where underlayment would benefit either performance or longevity.>>>

I'm right there with you Rozziroofer......Goofy, isn't it?>>>

Im a roofer from michigan your allowed 2 layers here. Underlayments on a recover is crazy and a waist of time and money.>>>

Looks like Vaa and elcid did not read the question.>>>