I'm in the same area as you. Extremes in weather from winter to summer.
I have 3 layers on my house and it still looks good after 10 years.
Except I remember the roofers cut out/cut off the part of the old shingles
that weren't nailed down. They added vents to the soffits and a few more
vents higher up on the roof.
What brand of shingles? About that
time, Certainteed made some defective
shingles. They admitted this. There
are many class action suites to get the
to pay for more than pro-rated shingle
replacement. Certainteed offered me
what will be a $7000 job. I declined
and became part of the class. If I get
nothing, I've only lost $500. If I get
$500, I broke even. If I get $1000,
woo hoo! I can buy a few tanks of gas!
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