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Old 11-30-2011, 07:46 PM   #1
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Leaking roof- likely from snow blowing under ridge cap into ridge vent


metal sheeted roof about 12/12 pitch was installed last summer. No leaks with rain but received several inches of snow along with strong winds. During recent thaw several drips appeared all on south facing ceiling. Contractor used a ridge cap extending about 12 inches down each side to cover the ridge vent. This left a 7/8 gap open between the ribs of the roofing metal. The vent is covered with screening to keep out bats. What would be a better screen or snow stopper solution?

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Old 11-30-2011, 09:11 PM   #2
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Leaking roof- likely from snow blowing under ridge cap into ridge vent


They make a special dence foam about 2" thick just for this. Any real roofing supply should have it.

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Old 12-04-2011, 05:29 PM   #3
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Leaking roof- likely from snow blowing under ridge cap into ridge vent


There is a material, looks like a brillo pad, 3-4 inches wide, that is put between the vent and the roof surface, acts as filter screen to keep snow out. I can't find the web page but its out there. Important point is to make sure the filter does not block the airflow. Ridge vent outlet area should be equal to or less than the lower soffit vent inlet area. Total ventilation area (in and out) should be equal to 1/150 of total attic/vented space, ie, 1 sf of vent per 150 sf of vented space. The vent area is to be dicvided evenly between inlet and outlet, so 0.5 sf in, 0.5 sf out. The outlet vent area should not exceed inlet, otherwise you form a vacuum and will suck conditioned air out of the house.
Heres a website with a similar material: http://www.profilevent.com/howitworks.html
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Old 12-05-2011, 04:29 AM   #4
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Leaking roof- likely from snow blowing under ridge cap into ridge vent


Here's metal roof ridge vent:

http://www.trimline-products.com/pro...vent-metal.cfm
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