Attic nails dripping

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Gntry

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Jan 18, 2006, 2:40:23 PM1/18/06
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I live in western NY and the weather here for the last week or so has been
around low 30"s, I was in the attic the other day and the nails coming
through the roof are dripping water....I have a full ridge vent, full soffit
on the west side of the house(and they aren't blocked by any insulation),
and gable vents. It is definately cold in the attic and there is about R25
on floor w/ barrier down towards living space, the roof was replaced about
10 yrs ago....what is causing this and should I be concerned?


Speedy Jim

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Jan 18, 2006, 3:07:26 PM1/18/06
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Gntry wrote:

Might not be your cause, but I had a similar situation
that defied explanation. It was so bad that at times
it was practically raining in the attic!

Turns out that that the gas furnace was the culprit.
It vented into a brick chimney which had a proper clay flue liner.
The chimney was in the center of the attic space.

The original monster furnace had been replaced with a much
smaller unit and, I surmise, flue gas temps inside the
chimney were now low enough to cause more condensation.
This moisture could actually be seen weeping out of the
brick mortar joints.

A metallic liner for the flue cured the problem.

Jim

Roger

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Jan 18, 2006, 3:50:05 PM1/18/06
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Haven't experience that, but guessing it may be simple condensation. The
nail conducts the cold from the base of the shingles, and if you have a
warmish, humid attic, it will condense, just like on the inside of a single
glazed window on a cold day. Perhaps your attic needs more ventilation to
lower the humidity.

"Gntry" <gn...@verizon.net> wrote in message
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Don Phillipson

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Jan 18, 2006, 3:25:21 PM1/18/06
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"Gntry" <gn...@verizon.net> wrote in message
news:HQwzf.2167$pq5.1585@trndny02...

> I live in western NY and the weather here for the last week or so has been

First, find out whether this is moisture traveling along
the nails from the roof top surface to the under side, or condensing
from the interior attic air onto the surface of the nails (cooled
by their heads through the sheathing.)

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)


bill allemann

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Jan 18, 2006, 4:09:11 PM1/18/06
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might be condensation. the nails would be at somewhat lower temp
than the surrounding materials.
is attic vented?
any exhaust from the living space vented into the attic instead of outdoors?

bill


"Gntry" <gn...@verizon.net> wrote in message
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Trajen

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Jan 18, 2006, 3:41:27 PM1/18/06
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Just guessing but....
I suspect the cause is why a cold glass of beer sweats on a hot summer
day. The nail is much colder than the warmer attic air. When dewpoint gets
close to temperature
you get visible water vapor. Try a small fan to get the air moving. Again,
only a guess.

"Gntry" <gn...@verizon.net> wrote in message
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CJT

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Jan 18, 2006, 4:09:11 PM1/18/06
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bill allemann wrote:

> might be condensation. the nails would be at somewhat lower temp
> than the surrounding materials.
> is attic vented?

I think he covered that!

> any exhaust from the living space vented into the attic instead of
> outdoors?
>
> bill
>
>
> "Gntry" <gn...@verizon.net> wrote in message
> news:HQwzf.2167$pq5.1585@trndny02...
>
>> I live in western NY and the weather here for the last week or so has
>> been around low 30"s, I was in the attic the other day and the nails
>> coming through the roof are dripping water....I have a full ridge
>> vent, full soffit on the west side of the house(and they aren't
>> blocked by any insulation), and gable vents. It is definately cold in
>> the attic and there is about R25 on floor w/ barrier down towards
>> living space, the roof was replaced about 10 yrs ago....what is
>> causing this and should I be concerned?
>>
>


--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

Doug Kanter

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Jan 18, 2006, 4:20:10 PM1/18/06
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"bill allemann" <custo...@sbcglobalDOTnet.invalid> wrote in message
news:X7yzf.12878$PL5....@newssvr11.news.prodigy.com...

> might be condensation. the nails would be at somewhat lower temp
> than the surrounding materials.
> is attic vented?
> any exhaust from the living space vented into the attic instead of
> outdoors?

Maybe a bathroom fan whose duct is leaking moist air into the attic?


CJT

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Jan 18, 2006, 4:21:41 PM1/18/06
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Gntry wrote:

I think you need to quantify "cold in the attic." Put a thermometer
up there. It could be pretty cold and still be warm enough for the
nails to be a lot colder. Everything's relative when you're talking
about relative humidity. :-)

In fact, you could probably also directly measure the humidity up there
with a cheap hygrometer (although I don't know how good they are at cold
temps).

Is your furnace in the attic, by any chance?

Could there be gaps in that moisture barrier, perhaps around light
fixtures, vent pipes, etc., that are leaking enough conditioned air
to carry the moisture you're seeing?

Can you discern whether some are dripping more than others? The worst
offenders might be nearest the source of moisture.

I would be concerned, particularly because of the possibility of mold
developing.

ba...@sme-online.com

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Jan 18, 2006, 4:29:09 PM1/18/06
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Roger that, Roger, on the moisture condensing. Under prev. owner, my
house had a variety of air leaks from heated space into attic. Roofing
nails, having their large heads very near the Great Outdoors and having
much greater thermal conductivity than plywood deck, served as main
points of condensation. Such that you could see pattern of staining
around their protruding shanks in summer. Slowly fading now. And ...
energy consumption waaaaay down.

OP might look for entry point(s) of relatively high absolute humidity
air from below. They sure are there, and with chimney-effect it doesn't
take a lot of flow-area.

HTH,
J

Bob

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Jan 18, 2006, 4:49:06 PM1/18/06
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"Gntry" <gn...@verizon.net> wrote in message news:HQwzf.2167$pq5.1585@trndny02...

Is it possible that the problem is caused by having the attic door opened?
If you go up, is the moisture there when you first get there, or only after
its been opened for awhile?

Bob

Jane Cook

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Jan 17, 2022, 8:15:07 PMJan 17
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I have a brand new roof. Has ridgevent, and there is a vent on one side of the attic. When it warms up I am getting water dripping from the nail sheath. What’s wrong? Who do I call?

--
For full context, visit https://www.homeownershub.com/maintenance/attic-nails-dripping-81884-.htm

Marilyn Manson

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Jan 17, 2022, 11:05:52 PMJan 17
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On Monday, January 17, 2022 at 8:15:07 PM UTC-5, Jane Cook wrote:
> I have a brand new roof. Has ridgevent, and there is a vent on one side of the attic. When it warms up I am getting water dripping from the nail sheath. What’s wrong? Who do I call?
>

Sounds like excess moisture in the attic. I'd start with whoever put on the roof and get
their opinion, although it might not be worth much, because

I'm not sure why there is a gable vent if they installed a ridge vent. It may or may not be
related to your moisture problem, but it's not a good idea in any case. Are you sure that
they didn't block the gable vent e.g. cover it with plywood on the inside?

https://www.jlconline.com/how-to/roofing/q-a-can-you-combine-ridge-and-gable-vents_o


micky

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Jan 17, 2022, 11:12:46 PMJan 17
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In alt.home.repair, on Tue, 18 Jan 2022 01:15:02 +0000, Jane Cook
<1cbe81fa70561c6e...@example.com> wrote:

>I have a brand new roof. Has ridgevent, and there is a vent on one side of the attic. When it warms up I am getting water dripping from the nail sheath. What’s wrong?

Too many steamy hot showers? Bathroom fan vent doesn't go all the way
through the roof, or at least to just under the ridgevent?

Though I woudln't expect them to change yoru fan vent, maybe for some
reason they did. Conceivably they moved it and forgot to put it back.

I have two vent fans that stop about 4" below the ridge vent, but I
never take steamy showers. OTOH, I have 100 n'bors with the same house
and probably half of them had the same plumbers and haven't heard any
complaints.

What's the out side temp, how warm is the attic when you call it warm?

Except for double bulb and maybe sling hygrometers, they aren't very
accurate, but even a cheap inaccurate one might give valuable
information. Yesterday I put a thermometer/hygrometer in my shirt
pocket under my jacket and a few minutes late the temp when from about
70 to over 80, and the humidity went from 40 down to 30. Later it was
back up. It's the cheapest hygrometer Ive ever seen, but it does move.



> Who do I call?

Ghostbusters

trader_4

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Jan 19, 2022, 9:38:58 AMJan 19
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On Monday, January 17, 2022 at 8:15:07 PM UTC-5, Jane Cook wrote:
That covers the outgoing air, what about the incoming? Is there sufficient
soffit venting? If there is venting, is it being blocked by insulation? Not unusual
to see that, insulation guys shove insulation blocking the vents. They have plastic
baffle like chute things that you can staple between the rafters to keep a channel
free of insulation.

And like others have said, anything venting into the attic that should not be?
Bath fans, dryers, etc?

micky

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Jan 19, 2022, 4:38:31 PMJan 19
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In alt.home.repair, on Wed, 19 Jan 2022 06:38:55 -0800 (PST), trader_4
<tra...@optonline.net> wrote:

>On Monday, January 17, 2022 at 8:15:07 PM UTC-5, Jane Cook wrote:
>> I have a brand new roof. Has ridgevent, and there is a vent on one side of the attic. When it warms up I am getting water dripping from the nail sheath. What’s wrong? Who do I call?
>>
>> --
>> For full context, visit https://www.homeownershub.com/maintenance/attic-nails-dripping-81884-.htm
>
>That covers the outgoing air, what about the incoming? Is there sufficient
>soffit venting? If there is venting, is it being blocked by insulation? Not unusual

I had soffits that were largely blocked by milkweed. At least, I
thought it was milkweed but it was something else. On the outside.
Easy not to notice and though it arose during the summer, it didn't go
away in the winter.

When I was on a ladder, I could peel it off like the lint on a clothes
dryer filter.

I think a tree near my house fell down and it's not a problem anymore.

Marilyn Manson

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Jan 19, 2022, 5:18:15 PMJan 19
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On Wednesday, January 19, 2022 at 9:38:58 AM UTC-5, trader_4 wrote:
> On Monday, January 17, 2022 at 8:15:07 PM UTC-5, Jane Cook wrote:
> > I have a brand new roof. Has ridgevent, and there is a vent on one side of the attic. When it warms up I am getting water dripping from the nail sheath. What’s wrong? Who do I call?
> >
> > --
> > For full context, visit https://www.homeownershub.com/maintenance/attic-nails-dripping-81884-.htm
> That covers the outgoing air, what about the incoming? Is there sufficient
> soffit venting? If there is venting, is it being blocked by insulation? Not unusual
> to see that, insulation guys shove insulation blocking the vents. They have plastic
> baffle like chute things that you can staple between the rafters to keep a channel
> free of insulation.

Also not unusual for roofers to (correctly) say "If we're adding a roof vent, we also
have to add soffit vents." Then they cut in the soffit vents but don't do anything
about dealing with the insulation that was already there (or not dealing with it
correctly, e.g. the baffles you mentioned, etc.)

When I had my roof done the roofer (a family friend) said to me "I've seen your attic.
It's going to be a real PITA to put baffles in, especially during this heat wave. I'm going
to have to charge you accordingly. Option 2: I'll toss in enough baffles for free and you
can do it yourself in the evenings, when it cools down."

I took him up on his offer and he was right. What a PITA. Dirty, sweaty, cramped.

BTW...I built one of these to put over the drop down stairs. Works like a champ.
Mine has such a snug fit that I added a couple of old cabinet doors handles to the
underside of the top so I can just grab them and pull it down into the opening.

https://www.youtube.com/watch?v=89GFFQtV8Yo



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