Any do’s & don’ts?
It’s a low slope, with one existing layer. Has some curl-up in a very limited area.
Thanks in advance for the advice.
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Don't do it?
Why not?
If the roof structure is strong enough, and existing isn't leaking, and you do a good job, what's your issue with shingling over?
any existing valleys? Hard to know the condition of the (insert age here) year old flashing/valley pan.
If there's any chimneys with step flashing you won't be able to flash the new roof correctly, water running down the flashing goes to the old roof, under the new layer.
Don't know the condition of the structure underneath (ie rot)
Too much risk with leaving the old roof if you're going to provide a warranty on the new. Better to gain control of the variables of the old roof and what's under it by stripping it than just hope for the best.
All good points...
small gable roof butting into a sidewall. No valleys or chimneys. No concern about rot below.
So....still a bad idea?
IMHO shingles don't last as long on a shingle over. I like to do roofs the best I can, so they'll last a long time and I don't have to get back up there again.
Life is full of uncertainties...or I could be wrong about that?
If it was me or on my own home, I'd strip it (not that I'd do it myself anymore, a roofing crew can be in and out on most houses in ~2 days, much faster than I can do solo and i have better things to do).
>butting into a sidewall.<any flashing there? There should be.
Not sure how you're positive about the 'no concern about rot below.' Edges at the bottom are (to me) notorious for rot, rotted soffits, etc.
and I have the same feeling Boss has about longevity.
jmbj
If it's small, why not tear it off?
See pics of what not to do.
Rich
Are the dark shingles the result of moisture underneath?
Wore out before second layer.
If money is a problem, a second layer can be added. I prefer to tear off and reroof properly. On my house, I'm 54, I will put a second layer on my roof, becase I just put a new roof on, and used 30yr shingles. This means that I figure I will be in my 80's and won't care>G<
lol
Around here we have many roofs with two layers (or more)Seems like it would be difficult to put a layer over a 30 year shingle (as it wouldn't lay down very flat, I'm just guessing)I've never seen two layers like thatI've only seen two layers of the three tab composition shingles
Not my worry! I'm only going to worry when I turn 80+, then I really don't think I'll care!!!!!!!!
That's what my grandmother said. And then she lived there until she was 95 and I had to tear two layers off and roof her house again.View Image
Well when I'm 95 I will call you to reroof for me>G<
I am a year younger than you.View Image
I have done a lot of roofing, and any time I had a tear off of more than one layer, I cursed the lasy @#$%^& who did them. I am 53 and would never put a 2 layer over shingles, ( And have argued and won with insurance CO. who don't want to pay tear off )I also do not like installing metal over old asphalt eather,( usually out building sheds, un insulated ) but have, and I also tell the clients that I will not warranty the roof .
IF IT WAS EASY, EVERYONE COULD DO IT !!!
usa
That's moisture that got under the shingles because they just shingled around the vent, and all other flashings. And then used that miracle black stuff.
If you shingle over the top, you need to lift the flashings and do them properly so that water drains on top of the shingles.
Rich
I don't love roofing, so any job I do I want to last. Best way to make it last is to tear off and re-do, for all the reasons the other guys list. Sure it's possible to roof-over. It's possible to re-paint your Porsch with house paint. Doesn't mean it's a good idea.
A new roof will lay down better if the old roofing is removed. It will also have better wind resistance in a storm and you will be able to see if any wood needs to be replace. Just a better job overall.
I had a really cheap business partner once. He wouldnt pull the old roof on a flip we did.
We finished the roof and came to work the next day in the rain. Got inside and had alot of water in the kitchen.
I looked at him and said have fun finding the leak.
God gave you a whole a s s, use it.
Family.....They're always there when they need you.