Hi, I'm looking for suggestions to the possible cause of snow entering the attic through at least five of the seven roof vents on the home pictured in attachments. Homeowner had enough snow through one of the vents to cause considerable water damage to the storey below last spring. Vapor barrier likely was the reason damage was limited to one area as the insulation was staurated under most vents.
He tried covering one of the vents with Tuck tape and vapor barrier thinking he may have had slighty to much exhaust vs. intake. There is basically no soffit on the front of the house. But snow has already entered agian during the first snowfall this winter through at least one vent.
The house has vapor barrier and R40 blown-in insulation, and is using Duraflo square top roof vents with a NFA of 50 sq in. And has double 5" soffit with an NFA of 7.53 sq. in. per sq foot. The pictures show the soffited areas marked with a red line, and roof vents are accuratly marked on the roof. The two vents over the large window on the back elevation have not been checked as they are not easily accesible.
I've spoken to a local shingling company who has recommended removing all exhaust ventilation from the roof and is ensuring me that another type of exhaust ventialtion, ie. ridgecap will have the same problem. Of course I have some concerns about doing this. But wonder if the soffit alone would be able to provide fresh air to the attic due to the multiple hights of the soffit. And air exchanger is also being used in this house.
The different heights of the roof vents to me are also suspect as I expect under certain conditions the lower roof vents are acting as intakes and feeding the vents above.
Any help would be greatly apperciated.
He tried covering one of the vents with Tuck tape and vapor barrier thinking he may have had slighty to much exhaust vs. intake. There is basically no soffit on the front of the house. But snow has already entered agian during the first snowfall this winter through at least one vent.
The house has vapor barrier and R40 blown-in insulation, and is using Duraflo square top roof vents with a NFA of 50 sq in. And has double 5" soffit with an NFA of 7.53 sq. in. per sq foot. The pictures show the soffited areas marked with a red line, and roof vents are accuratly marked on the roof. The two vents over the large window on the back elevation have not been checked as they are not easily accesible.
I've spoken to a local shingling company who has recommended removing all exhaust ventilation from the roof and is ensuring me that another type of exhaust ventialtion, ie. ridgecap will have the same problem. Of course I have some concerns about doing this. But wonder if the soffit alone would be able to provide fresh air to the attic due to the multiple hights of the soffit. And air exchanger is also being used in this house.
The different heights of the roof vents to me are also suspect as I expect under certain conditions the lower roof vents are acting as intakes and feeding the vents above.
Any help would be greatly apperciated.
