On 11/25/2019 9:55 PM, micky wrote:
If one gets a new asphalt? shingle roof with 20-year Monsanto? shingles,
how long should it last? 20 years?

Mine is only 13 years old and has a small leak already. I can't see the
back half of the roof from the ground, but the leak is in the middle,
not by the chimney flashing.

I watched them put it on and they did a good job. They used famous name
shingles, though I can't remember if it was Monsanto, 3M maybe.


Shingles not curled or losing grit, they are OK. How do you know where
leak is? It could be in some poorly sealed area and flowing down to
someplace else. Best if you can observe it if you can see underside
when it is raining. A roofer could find it and fix it but you may be
able to do it yourself.

Shingle roof should last anywhere from 20 to 50 years.