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Old 09-16-2012, 10:05 AM   #1
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rafter vents


when installing rafter vents...do they need to be full length---eave to ridge---or just long enough to clear the depth of the insulation ?

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Old 09-16-2012, 10:22 AM   #2
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rafter vents


Are you talking about foam or plastic baffles?
If so they just need to clear the insulation.

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Old 09-16-2012, 10:58 AM   #3
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yes, I am using the foam baffles/vents.
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Old 09-16-2012, 02:14 PM   #4
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rafter vents


insulation baffles are installed prevent insulation from blocking the air flow from your soffit vents to the ridge vent. therefore they should extend above the insulation.

I like the following baffle http://www.owenscorning.com/around/v...s/VentSure.pdf it blocks air flow (windwash) from the soffit vent through air permeable insulation. cold air running across a warm ceiling can lead to condensation.
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