I discovered mold in a tight area of the attick in the underside. the
roof is only a couple yrs old, has both soffit and tidge vents (soffits
are open. Ive been sealing any leaks to the attic i can find. Ive been
told to add a power ventilator and put in gable vents also. but this
http://www.ronhungarter.com/ventilation_repairs.html seems to
so 1) what do I do
2) what do I do about the existing mold
you may have humidity leaking up from the house especially if this is
over the bathroom...
seal the floor of the attic to prevent warm humid air from entering the
cold attic.....seal opening where wire come through etc..
spray bleach directly onto the mold to kill it...
Do this ASAP before it spreads anymore....
Depends. Conditions in Malone differ from Brooklyn. Mainly in that the
vent fans I've seen are controlled by t-stat, so they run when temps
are over set-point. Nothing to do with moisture- just keep from
charring rafters (DAMHIKT in CT) and frying shingles.
For moisture, you gotta let it, or help it, to go outside, and
absolutely prevent it from going where it can do harm. Even a small gap
in sheetrock taping on ceiling can let lots of water vapor escape
through and up. I'd check entire area below location of mold, and
really seal it properly. Been there.
I agree with Nick on this one Bob. I Arizona, and Denver, low RH is a
problem, even in the summer. It all depends on where you are located.
Warm air CAN hold more moisture than dry air, but that doesn't mean it
Actually, if it is too wet in the attic, having the attic hotter will
LOWER the RH.
Putting in a powered exhaust fan can pull the attic into a negative
pressure with respect to the house and pull cool air out of the house.
That may cause localized condensation in the attic. I don't recommend
If you must use a powered attic fan, use two instead. Set one blowing
in at one end and another blowing out at the other end. That will keep
attic pressures more neutral. But find out where the moisture is
coming from and stop it. (Source Control)
Did this problem just start after you had the new roof installed?
no but the symptoms certainly have. The old roof had virualy no
ventilation. I noticed frost on the nails at the time but the main
symptom was ice damming. the roof was old double shingled so we
contacted some roofers who all said venting was the problem. now i am
where I am - crawleng around looking for air leaks and finding mold in
the small L tight region area in my ranch
If the moisture coming in from outside in the summer, then a
thermostatically controlled fan will help. If the moisture is getting up
there in the winter, it's probably coming from the living area. You need to
keep it out, because a thermostat on a fan won't come on if the attic is
Ive been sealing any and all openings i could find and added exaust
fans to decrese moisture in the house itself.
i know some vent fans also have a humidistat.
here is answers I gave to someone on anouther forum hope it gives more
((Are your soffit vents continuous?>>>>
were sealed I cut openings every 3 feet.
Are your ridge vents continuous and NOT of the nail-over foam type? The
ridge vents need to be the baffled type to allow proper air flow.>>>
nail over foam cobra is the brand -like this
Are your bath and kitchen vents vented to the outside and NOT into the
bath didnt have vent just added to vent moisture out of house
Is there a tree or other shade directly over the problem area? Perhaps
you need the trim branches, etc.>>>
lot of trees, tall evergreen on side but not directly over.
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