Attic Ventilation, insulation and window condensation
Just wondering the following: can excessive attic ventilation and sub-adequate roof insulation (R25 in a Zone 5 northern climate) be the cause of our windows having condensation issues? We have what are supposed to be "high end" double hung high energy efficiency windows but have had major window condensation issues (especially on the 2nd floor) ever since our addition was built in 2001.
Also, in terms of excessive attic venting, I mean there are two large gable end vents (16' x 30") at both ends of the roof, plus fully functioning eave/soffit venting all along both sides of the 30' long roof. Any thoughts would be appreciated.
Eastern Ontario, Canada