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2136 Views 6 Replies 3 Participants Last post by  Gary in WA
I am sure this topic has been beat to death. I live in a 2 story 2300 square foot house. Last summer I put on a new roof with Shinglevent II ridge vents.(approx 39 feet)

Our upstairs of our house is always hot in the summer. This spring I had a heat pump installed. Best purchase yet. This fall I plan on adding insulation. I currently only have R12, Code is R40. I installed rafter vents and made sure all soffits are open. The attic is approx 1200 square feet.

The soffits currently have 9 - 16"x2.5" vents cut out. 4 on the front of the house, 5 on the rear.The soffits are cedar tongue and groove.

Should I be adding intake vents or just leave it be? I have tried to figure out the math, but it seriously had me dreaming of numbers all I live in Vancouver British Columbia if that helps.
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Continuous would be way better than 8x16's as you will vent each rafter bay rather than one vent every 7' (depends on brand 8x16=65NFVA and 2-3/4 cont. is 8-9 NFVA)

Install it closest to the fascia board for best air pressure, pp. 616: airflow with gable vents&f=false

Cont. soffit = 1/2 cont. ridge vent plus add the other side soffit = balanced. Be sure to air seal the attic, much more important:

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The soffit vent location is fine, just expand the amount for continuous. The box stores sell it screened and louvered.

"Does that sound appropriate and will it make a noticeable difference in my house?" ---- It will help, though the added insulation will insulate the house from the attic for a noticeable improvement.

Air seal the attic holes before insulating and after adding venting- what to look for:

Check your other pages here also:

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