venting with no horizontal roof line

Windows on Wash

Hot mess from a venting standpoint.

Best bet for equal distribution is probably over deck at this point AGW?

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roofnron

I do like above the deck ventilation but it won't though do anything to help the OP's original problem of venting the moisture he has between his ceiling and the original roof deck.

Also, with the above deck ventilation accessing proper intake is still a problem unless your are considering pulling air from the rakes.

Regarding the SmartVent,

I haven't installed the SmartVent product in a valley situation, but I am not sure why you are saying it wouldn't work, (maybe I am missing something obvious). The intake holes are 6.5" up from the center of the valley. My problem with the product is can it pull enough air for all the rafter bays from 1 small opening at the bottom of the valley to be effective. Maybe it is better than nothing though.

I have a contact at SmartVent, I will call and ask their opinion and report back.

AGWhitehouse

Yep, continuous ridge vents at the ridges and intake opening within 3' or so of the valley discharge. That will give enough vertical distance for passive convection. Problem with this approach is the expense. You'll be re-roofing and it would be best to move the insulating envelope to the underside of the roof. Quite an undertaking.

If the budget is tight, I still feel that the sidewall louvers and mechanical ventilation is the best option. It doesn't require messing with the roof and it shouldn't require much additional insulation work. Just need to find the "trouble" areas, ensure air sealing and thoroughness of the insulative envelope, and install the louvers. The whole job could theorectically be done in a weekend, providing what I'm picturing as existing actually is existing.

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AGWhitehouse

Here's a graphic to display my description:

The dashed lines are the roof extents, ridges, and valley lines

The white solid lines are the exterior walls and potential knee walls (i'm assuming they all exist as the space was noted to be finished

The cyan linework are the louver locations. The exhaust would be location of the power fan, which could either be solar activated or tied to the electrical service, though this may require additional wiring. If you can ensure a vertical dimension of 3'-0" between the intake and exhaust louvers (exhaust higher) then you won't need to provide a mechanical fan.

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