In many locations, the presumption is that these are issues/questions that
the buyer is expected to resolve at or before closing. After the sale is
complete, you don't necessarily get to retroactively address these issues.
If you read my post, I said IF:
1 - It was recently re-roofed
2 - Code says 3 layers are not allowed
3 - A building permit was required, but not pulled.
Then you have a good case.
Shingles have weight. Each layer of shingles puts weight on your roof
structure. This structure must support this weight and the weight of other
things (snow and ice come to mind). 3 layers of shingles may be too much
weight for your roof structure.I 'd be concerned about the roof collapsing.
I'd really worry come Winter.
inspection and pronounce it good or bad and if the top layer looks good, he
would not do any in depth inspecting.
As for the number of layers, there are probably tens of thousands of houses
with three layers. There is the potential for problems, but I'd not act too
quickly. If it has been on there for 10 years, I'd do nothing until it was
time to re-roof. Not knowing the construction, none of us can say if there
is serious danger from the weight. Pitch, snow load, type of rafter or
truss, etc. all play a part. Just look at the weight of the older slate
Slate roofs were certainly not placed on stick-framed houses only sized
for asphalt...that's totally unrelated to the OP's situation.
I agree it's highly unlikely if it's been there any length of time
there's going to be a problem tomorrow.
While weight can be a consdieration, the primary proscription on the
third layer is it tends to shorten life of the new shingles from
additional heat and poor conditions underneath.
As others have said, 3 layers is not a good idea and it does not meet most local
codes. On the other hand, older homes often do turn out to have 3 layers
because someone went ahead and added a 3rd layer without doing the tear-off that
should have been done first. If you had a home inspection done before the
purchase, that definitely would have given you the info on the status of the
roof. As far as trying to go back now and stick it to the seller, that's
doubtful at this point. The fact that you were now able to discover the status
of the roof by checking on your own means you could have done the same thing
before you bought the property.
If you don't see any evidence of sagging, and the roof seems to be in good shape
and is not leaking, you may not need to do anything. If you are getting close
to needing a new roof anyway, it would probably make sense to go ahead and get
estimates and have it done now before this coming winter.
Before doing anything else, confirm that you DO have three layers of
It sounds like you don't have much experience examining roofs (and
there's nothing wrong with that ;) ) so get a roofer or other
knowledgeable pro out to confirm. THEN decide what, if anything, you
should expect from, or need to do to, your roof.
:I moved into my house not too long ago and had the first occasion to
:want to go up to the roof yesterday. It looks like there are three
:layers of shingles. I've read that you should never have more than
:two layers of shingles because of the weight. How much should I worry
:Thanks for your input,
My understanding is that 3 layers is maximum, i.e. if a roof with 3
layers needs reroofing, a complete tearoff is the first step. This is
what happened when my roof was redone around 3 years ago. Judging from
this thread, many if not most areas now require no more than 2 layers.
As noted, make sure about your assessment of how many layers are on
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