Brick bungalow in midwest US. Scraped and shingled in 1997. No visable leaks,
curling, cracking, etc. Shingles were rated for about 15 years.
Building code allows 2 layers of shingles.
Should I wait for visable problems with the old shingles or should I look
for another way to determine when to add a new layer?
15 year shingles!!!!! I didn't know they even made such a product. The
cheapest crap available. Next time buy a better line of shingles and you
won't be looking to pay to have them replaced over again.
They're what you call "builder quality". And that's not a compliment.
Everything I've ever been told by reputable roofers is that doubling-up
shingles is a poor idea. Professionals usually won't even warranty a
double-up job, if they'll agree to do it at all. The correct approach is to
remove the old shingles and redo from scratch.
Maybe the OP doesn't want to pay the landfill fees...
I'll second that. Total tear-off, AFAIAC, is the ONLY proper way to redo
a roof. Labor is half the cost or more for the job, and the extra years
you get by NOT double-layering will pay for the additional day to strip
the roof, and the extra dumpster. People at work know I grew up in the
business, so when they seek my advice, that is what I always tell them.
The 'upscale' roofing company in town pushes those T-lock 'floating
overlay' roofs. When I was getting estimates, I basically threw the guy
out of my house when he claimed there was no benefit to stripping old roof.
Plus, bare deck is the best way to check for soft spots that need
patching, and refresh the flashing and drip edge, plus add the overhang
and valley ice shield a 1997 roof is unlikely to have.
Which is exactly what my neighbor ended up needing. When we had our roofs
done a few years ago, he had one corner where most of the gravel had worn
off the shingles. Under that was wood that had rotted and needed to be
replaced. Removal of the shingles exposed the wood.
I don't see how you could properly do those without a bare roof to start
My view is "if it ain't broke, don't fix it."
You may be in an abnormally mild climate, or had more than your share of
cloudy days. You may have a batch of 40-year shingles that were mislabeled.
Further, if you have a mischievous hail-storm next week, your insurance
company may pay for it.
Don't add a second layer. Do a tear-off and start from the bare sheathing.
That way you can not only repair any vulnerabilities but you can take
advantage of newer materials and technology. For example, the new mylar
reflecting material that replaces tar paper. It is even more leak proof than
felt and keeps your attic cooler.
On Fri, 21 Oct 2011 17:41:24 -0500, Wilfred Xavier Pickles
If the shingle still look good and are laying flat, I'd wait another
year or so. Mine 15 year shingles were 22 years when I put a new roof
There are varying opinions on tear off. If the shingles are curling,
warped, flashing bad, it is best to tear off. If they are in general
good condition, it is possible to put a second layer. Talk to a
reputable roofer about that and have him take a look.
In my case, I left them on and after 10 years, everything is just
and groove yellow pine I put on the stripped down roof.
I had new shingles put on by pros and they said how beautifully the
shingles nailed down, and I said that is because of the wood under the
single layer of shingles. No need to remove the old ones. It has bee 6
years and all is well. Center city Philadelphia,
Harry makes a good point though. Houses in the US are often built
with high maintenance materials that last 20 to 30 years. Houses in
Europe are often hundreds of years old with stone, brick, state, or
clay that needs little of no maintenance.
A few weeks ago, we stayed in a place in Italy that was built in 1200
and refurbished in the 1400s. Of course, it has been upgraded,
plumbed, and electrified since then.
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