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Old 12-25-2011, 05:35 PM   #1
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venting problem needs solution.

My house has a ridge vent and continuous soffit vents running the full length of the house on the front and about half way on the back (There was a room addition put on the back of the house which merged with the existing roof). The new addition has no attic space so I don't think I can tie into the newer roof's attic to compensate for the loss of soffit vent at the back of the house. Any suggestions to vent the "soffit-less" part of the roof? Thanks.


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Old 12-25-2011, 08:55 PM   #2
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Where are you located? Do you get a lot of snow?


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Old 12-25-2011, 09:00 PM   #3
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Why not just add soffit vents to that area?
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Old 12-26-2011, 04:57 PM   #4
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Originally Posted by shazapple View Post
Where are you located? Do you get a lot of snow?
I live in MD outside of DC. Normally we don't get too much snow.
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Old 12-26-2011, 08:08 PM   #5
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Can you post a couple pictures.
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Old 12-26-2011, 08:30 PM   #6
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Venting may not accomplish anything depending on how the addition was insulated.

Need to know more about the structure to make proper recommendations.
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Old 12-27-2011, 10:39 AM   #7
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I will take some pictures and post them. In the meantime, here is a diagram of the roof showing the current vents.

The original structure is shown in blue and the addition in orange (This is not to scale). The addition was constructed by a previous owner so I don't know much about the construction. The addition is tied into the original roof. I do not remember if the addition has a ridge vent on it (I will check that when I take pictures but I don't think it does). The soffits have the perforated vinyl siding material but I cannot verify if its just decorative to match the original house's soffit or are true soffit vents. There is no attic space above the addition. I believe it is just sheetrock, insulation and then roof. In the attic of the original structure where the roof meets the addition I can see the wall of the addition in the attic and fiberglass insulation. There is no access to the addition from the attic so I'm sure I can't rely on the soffit vents of the addition (even if they are vents) to compensate for the loss of the soffit vent in the original structure.

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Old 12-27-2011, 09:18 PM   #8
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You may not actually have a problem, or it may be worse than you think.

Ridge venting typically is rated at 18 NFVA per lineal foot.

If you can figure out the NFVA rating of your continuous soffit, you can figure out how much intake ventilation you have.

If you have more intake ventilation than exhaust, even with the "loss" of intake at the addition, you are still in good shape.

... as long as your soffit intake isn't blocked by insulation at the top of the wall

... and as long as there are rafter baffles in the cathedral ceiling of the addition.


Last edited by Gary in WA; 12-28-2011 at 12:12 AM. Reason: removed web link- belongs under sign. line.
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