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Old 08-05-2012, 12:21 AM   #1
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Icedam


My shingles have bulged up about three to four feet up from the gutter edge. This winter due to high winds, I had some soffit get pushed up into the eave. When I tried to adjust the metal soffit, I noticed that there is an old wooden soffit above the new aluminum soffit. Would this 'double' soffit be enough to prevent adequate airflow hence the ice damming?

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Old 08-05-2012, 08:23 AM   #2
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Icedam


Ice dams are a heat loss issue first.



Fix the heat loss first with proper air sealing and insulation and you will be much less likely to have any issues even with the current ventilation.

That all being said, yes, ventilated attics help mitigate ice dams by removing heat from the attic.

If the soffit is doubled up, it is very likely that it is also obstructed. Yank them both down and replace them with a wide open version.

Be sure that your exhaust is sufficient too (usually a 60/40 split intake and exhaust works well).
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Old 08-05-2012, 11:27 AM   #3
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Icedam


Many times when people cover old wood soffit with aluminum they completely forget about or ignore the ventilation.
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Old 08-06-2012, 06:26 PM   #4
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Icedam


Thanks for the info and diagram. The house has a vaulted ceiling and there is, if I recall correctly, only 6 inches of space between the ceiling drywall and the roofing deck. I had to remove the drywall from the ceiling in one room when renovating so I know the space is limited...how does the limited space effect ventilation?
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Old 08-06-2012, 11:40 PM   #5
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The limited space more often affects the proper R-Value depth.

Ventilation should be accomplished in this case by the vent chutes that are in the rafter assembly and tight to the underside of the roof deck, however, they, while necessary, eat up what is already lacking R-Value.

If the rafters are 2x6 then you only have 5.5" to start with of which, you give at least 1" back to the vent chute. 4.5" insulation is not proper in any roof assembly and certainly not in Alberta.

Whoever designed that roof set up needs to be slapped.

Regardless of ventilation, that roof will be very likely to ice dam all the time.
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