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Posted by David Nebenzahl on June 6, 2008, 4:19 am
On 6/6/2008 12:05 AM Aaron Fude spake thus:
>> 65b76fef6...@e53g2000hsa.googlegroups.com:
>>
>> > What's the point of caulking the roof flashing for the exaust fan
>> > vent?
>>
>> > Specifically, I'm talking about what takes place at 2:20 in the
>> > following video:
>>
>> >http://youtube.com/watch?v=IrwWOW9RE3Q
>>
>> > It seems to be protection against the water flowing up. Is this done
>> > to protect agaist the moisture drawn up by capilary forces? And in
>> > that case, are the shingles themselves caulked?
>>
>> > Thanks!
>>
>> You've seen other replies with good reasons. Another is ice. Ice builds up
>> in places then backs UP the roof and UNDER shingles when it can.
>
> All of the replies make perfect sense to me.
>
> The one thing I'm puzzled by is that all of those would also be good
> reasons for caulking each individual shingle as well. Yet, that's not
> the case. Is that becuase there's plywood under the shingles and a
> hole under the flashing?
Well, it's been a long time since I handled any shingles, but I remember
the asphalt ones had sticky strips on the bottom near the front edge
that would bond with the shingle underneath; does that count? Of course,
neither wood shakes nor tiles have any such sealants, and they seem to
work fine.
I have a customer with a practically brand-new (OK, 10 years old, but to
me that's brand-new) million $-plus house, who reported a leak around a
light fixture in a room. Walked the roof, which was in just *perfect*
condition; nothing loose, not a crack where one could see a chance for
water getting in. Turned out it happened during a storm this spring
where high winds drove rain under the shingles. In a case like that,
there's not much that's going to stop *some* water from getting in somehere.
--
The best argument against democracy is a five-minute
conversation with the average voter.
- Attributed to Winston Churchill
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