I have water dripping from the nails inside of my attic. The attic is
vented by a ridge vent, soffit vents (both run the full length of the
house) and 2 2X3 wall vents. The heating trunk lines for the upstairs
heating (hot air) runs through the attic (they are fully insulated) and
the chimney also runs through the attic but is only used to vent the hot
water heater. The water is beginning to run down the insulation of our
cathedral ceiling and is running down the wall. Any suggestions would be
It would be the opposite, first you cant have to much as an attic
should be at exterior temp, condensation is caused by cold transfering
to hot so its undervented or just being heated from below to much,
Their heat supply in in the attic and its"insulated" , but not enough.
Something clearly wrong; if not a roof leak.
Sounds like a) Too much humidity and b) Insufficient attic
Causes can be lack of a vapour barrier in ceiling of the rooms below
Possibly something venting into attic instead of outside. Sometimes
done by cheap or ignorant builders.
Whatever the cause there is good chance of rot/mould and possible
health concerns. Also roofs are expensive! Recommend problem be
attended to before a new roof is needed.
In this climate the requirement is that there be a minimum of 0.3%
(that's 3 square feet per 1000 square feet of floor area) of attic
ventilation arranged to provide cross ventilation. In this house,
where the roof is 62 feet by 37 feet, and the actual attic some 60 by
33, or about 2000 sq. feet, we have gable end vents and have
additional vents along each soffit/roof overhang.
The problem is that your under layment or felt paper more than likely does
not have the ability to let the moisture rising up from your appliances tak
ing showers etc...the felt traps the moisture trying to escape so it stays
in the attic and due to the humidity the moisture attaches to the nails ju
st like a coke can you take out of the refrigerator and accumulates until d
ripping down...bigger problem is any moisture that does pass through the na
ils gets trapped above it because itβs trapped by the non breathabl
e felt and it fans out on top of the plywood decking under the felt almost
like a trash bag on a wrestler tryin to lose weight quickly..they are calle
d cats eyes if there is rot around the nail head inside itβs way wo
rse on the top side...change your roof and get a system that will address t
hat and increase your ventilation as well
On Friday, January 12, 2018 at 11:11:08 AM UTC-5, firstname.lastname@example.org wrote:
This is an old thread, the OP and there problem is long gone. But since
you re-opened it, if there is excess moisture in that attic, it's not
the underlayment that's the problem. According to the description, the
attic has a ridge vent, continuous soffit vents. That should be enough
to allow proper ventilation through the correct path. Assuming it's
excess moisture and not a roof leak, I'd be looking at why there is too
much moisture in the attic. Are bathroom vents venting into the attic
instead of outside? A dryer hose disconnected and venting in there?
Humidity from a humidifier set too high? No vapor barrier on the insulation
facing the living space?
How many nails are dripping water? How old is the roof? All located
close to each other? Ice/or snow on roof? I would try, first, to
locate the spot on the outside of the roof to see if shingles are
broken, warped or missing. Look, also, at any water stains inside roof
deck. If the drips are low on the roof and there is snow or ice, it may
be ice damming that needs to be removed. Gutters full? Photos might help.
If you have either an old roof or leaks scattered about, you may need a
new roof. If you are handy, or have a handy friend, and there is only
one defect, can likely either replace a broken shingle or repair
protruding nail head(s) and seal them up. Bag up the wet insulation and
get it out, then put down a tarp until the leak is repaired.
On Feb 19, 11:21οΏ½am, Patpamp_at_optonline_dot email@example.com (Patpamp)
Just because the water is drippeing from the nails doesn't mean that
is where the leak is. The leak will probably be somewhere above that,
running down and dripping off the nails.
You have to determine EXACTLY where the leak is. Before you go getting
anew roof, check where the vents protrude thru the roof. many times
the rubber boots around them crack and leak. Then check the ridge
vents and other things protruding thru your roof. If you can't
determine where the leak is coming from, then call in a pro.
Hank <~~~~professional online fixer. :-)
Sounds like condensation if it is driopping from all or most of the
nails. The OP didn't say whether this was something new, the first
time they were in the house in the winter, etc. OP - Please fill us
in with these additional details.
On Feb 19, 10:21 am, Patpamp_at_optonline_dot firstname.lastname@example.org (Patpamp)
Most all nails? And I bet its not raining and not snow covered but
cold. Condensation occurs on the coldest part of a home, like cheap
windows or on windows when humidity is high or metal and your nails
would be the coldest thing hitting warmer attic air. So if im correct
in guessing its just cold out, your attic is undervented for the
ampount of heat loss and air infiltration getting into the attic from
below. This means sealing and insulating it better. It the wood
black , is it a new issue after work was done. Condensation leads to
mold, then wood rot, then big big repairs. How thick is insulation,
where do you live and what temp is it
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.