"It could be that the ridge vents themselves have caused an increase in humidity. Did you remove standard box vents when you installed the ridge vents? Do the ridge vents have a fabric bug screen?
I noticed in one of the photos that…"
"David N, as mentioned this is a suspended concrete slab over a room below. So no, this is not a ground water issue, this is condensation occurring because the slab temp is below the dew point of the exterior air (the house is not yet heated)."
"I have actually been having this occur regularly this winter on my partially completed house. I do not have any garage door and the walls are not insulated. The floor is a 10" suspended concrete slab and I have had several days when…"
"My response is based on my assumption that there is fairly free exchange of air between the garage interior and the exterior. I was not able to follow your description.
For there to be condensation, it means the interior walls of the garage…"
This group will focus on the issues associated with incorporating renewable energy sources like Solar PV, Solar Thermal, Geothermal, Small Wind, Small Hydro into the Residential Energy Efficiency and Sustainability business model.
"Thanks David - I was going to look at PVC for the HRV but was cautioned against it, not because of the offgassing (which would not be relevant for dryer), but because the static build up leading to a high resistance to air flow."
"Various studies have indicated very little air flow along surface of duct (for ventilation - have not studied forced air). So if this is for venting, the screws would not be an issue at all as the pressures are to low.
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