"You absolutely have to identify the source of the moisture. In the winter time, if outside relative humidity levels are low or if below freezing, then the moisture must be coming from the house. Look for bathroom vents or a bypass that could…"
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Dwayne M Petko
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condensation in attic
24 Replies
visited attic of a house built in 1972 in columbus ohio. problem is condensation and frost on underside of roof sheathing in attic. air turnover is 6.6. attic floor has been sealed and all known…Continue
Tags: attic, in, condensation
Started this discussion. Last reply by Joseph Novella Feb 19.
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Peter Krych replied to Dwayne M Petko's discussion condensation in attic"Does the homeowner humidify his home with unit attached to his furnace? Those devices can over humidify and send excessive moisture even into a well sealed attic."
Eric Kjelshus replied to Dwayne M Petko's discussion condensation in attic"I put a HOBO in crawl space that was wet to damp but out side was very dry. The water line was dripping from the fitting from poly to steel 7 places. Water mist ran a 2nd floor 18' into dirt rotted the rim and got floor board…"
Noah Glatfelter replied to Dwayne M Petko's discussion condensation in attic"Was just following this conversation, just wanted to add to make sure to check all the penetrations through the roof. Its possible that pipe boots could be failing. They get dry rotted and loose there elasticity. If rain combines with…"
Norbert Muller replied to Dwayne M Petko's discussion condensation in attic"I would look for bypasses from the basement to the attic and check out the duct connection on the fans. Looking at the duct, I doubt that there is a lot of air being exhausted. Is the roof deck always wet or is it seasonal?"
Dwayne M Petko replied to Dwayne M Petko's discussion condensation in attic"2 adults 1 child. flex duct is for 2 bath fans. there is no ridge venting. attic moisture is on plywood on underside of roof only. no wet of damp insulation. heating is forced air gas, I don't know how old.…"
Norbert Muller replied to Dwayne M Petko's discussion condensation in attic"Before I comment I have a few questions. What is the orientation of the home? How many occupants? The flex duct is for 2 bath fans? Does the home have ridge venting? If so what type? Where in the attic is the moisture, only on some areas or on all…"
Kevin Wood replied to Dwayne M Petko's discussion condensation in attic"OK next is the insulation has become saturated somewhere and you will have to find the area. I would say it might be time to get a scan of the ceiling for cold spots and to check the area with a non invasive moisture meter. I have found situations…"
Dwayne M Petko replied to Dwayne M Petko's discussion condensation in attic"thank you. that was my first recommendation. Homeowner did seal passage from porch to attic using polystyrenene boards sealed with dow spray foam. THis was completed 6 months ago before winter began and had no affect on…"
Kevin Wood replied to Dwayne M Petko's discussion condensation in attic"Your problem is in design according to what I see in your first picture. The covered entrance section needs to be completely sealed and vented from the main attic from the inside. The moisture collected below the walk in area or patio is trapped at…"
Bruce Navin replied to Dwayne M Petko's discussion condensation in attic"The house in question is in Columbus, Oh. I haven't checked, but I would guess it is all but identical to Pa."
Kari Sauder replied to Dwayne M Petko's discussion condensation in attic"I'm in PA --I forgot about that -- should have remembered about climate differences and referenced accordingly -- thanks. We have frost to only about 4' below ground level here in winter and the site grading is pretty stable. …"
Dwayne M Petko replied to Dwayne M Petko's discussion condensation in attic"I will ask for a record from homeowner. I think he is keeping records of temp and humidity. we have eliminated all sources of water into attic except moisture in basement (not excessive water) just basement dampness. "
Bud Poll replied to Dwayne M Petko's discussion condensation in attic"Hi Kari,
Since I see you pay attention to details, in my northern climate (Maine), not sure where you are, but we have to add a bit more to the slope adjacent to the house. Depending upon the soils, frost can lift the soil 6" or more about two…"
Kari Sauder replied to Dwayne M Petko's discussion condensation in attic"while we're discussing gross water infiltration...I took another look at the house picture and have another question...how's the drainage off the roof? The land looks pretty level and if the down spouts don't have extentions or…"
Eric Kjelshus replied to Dwayne M Petko's discussion condensation in attic"What is the RH of the House? What is the RH out side I have seen a water leak up the RH 40% - I saw a roof leak next to condenstat line dump 4 gal a day into the home. I have seen dryer vent into attic…"
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- At 6:56pm on September 11, 2011,
Diane Chojnowski said… Hi Dwayne,
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