I'm wondering what the rule of thumb is for when you need to replace
the (asphalt) shingles on the roof. I moved into my house (in
Ontario) 10 years ago, and I think the roof may have been layed around
5 years previous to that. Having said that, I do need to get my
chimney repaired, and I need to replace the solar panels for the pool
both this year, so I'm wondering if it's worth my while to get the
shingles done at the same time or not.

I'm wondering if there's any way to estimate the remaining life of the
shingles, and whether it's expensive to get shinglers to remove/
replace mounted solar panels if they have to work around them.

Any info on this would be greatly appreciated.

Thanks, John