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
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"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…"
"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…"
"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…"
"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?"
"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.…"
"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…"
"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…"
"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…"
"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…"
"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. …"
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A presentation by Greg Labbé in April 2014 on retrofitting vintage home for energy efficiency. He talked about basic building science, brick houses, movement of heat energy and moisture in and out of the house, air barrier and water barrier, house…