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Old 05-14-2012, 01:06 PM   #1
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white around vented soffits


I found that my vented soffits have a white film growing around them. Not everywhere, just near one corner of the house. Does anyone know what might be causing that?
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Old 05-14-2012, 01:43 PM   #2
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white around vented soffits


Do you have blown insulation ?

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Old 05-14-2012, 02:28 PM   #3
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white around vented soffits


+1

Do you have attic access?

Is there a bathroom near that corner? Exhaust fan?
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Old 05-14-2012, 03:58 PM   #4
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white around vented soffits


Quote:
Originally Posted by Windows on Wash View Post
+1

Do you have attic access?

Is there a bathroom near that corner? Exhaust fan?
or a dryer vent?

That's a potential disaster, but it happens:
http://life.nationalpost.com/2011/09...0%99s-not-all/

The dryer caused an even larger issue. The flexible exhaust line travelled through the ceiling of the garage and had become disconnected, blowing a massive amount of lint and moisture into that area over time, coating everything in cobweb-like lint, water and of course, mould. Not good. Even worse, the lint had also built up around a couple of pot lights and could easily have started a fire — not exactly what this, or any family wants to hear.

Last edited by M3 Pete; 05-14-2012 at 04:02 PM.
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Old 05-14-2012, 07:36 PM   #5
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white around vented soffits


Looks like aluminum that is pitting/corroding due to bare metal showing at the edges of the perforations.

Moisture will accelerate this. I'd look for a bathroom fan that is terminated in the attic. It was common practice by some to run the flex out into the soffit and let it be.

I'd start there.
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Old 05-15-2012, 12:55 PM   #6
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white around vented soffits


Thank you all so much for your help. Yes, there is a bathroom vent nearby. I do have access to the attic and there is blown in insulation. I was unable to find the end of the vent on my first entry to the attic. I guess I will have to "suit up" and head back in there again. I am assuming that this means the vent is not well connected to the outlet vent (not shown in the photos) ...and if I connect that better, it should take care of the problem.

I really appreciate your help.
Thank you
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Old 05-15-2012, 02:20 PM   #7
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white around vented soffits


Score one for this guy....
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Old 05-15-2012, 02:20 PM   #8
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white around vented soffits


BTW...vent the vent through the roof. They never work when they are dumped at the soffit or worst yet...in the attic.
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Old 05-15-2012, 04:35 PM   #9
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white around vented soffits


While you are in the attic, check to see daylight through the punched-hole soffit venting. From the pictures it appears they are not open under the punched-hole soffit. Many times this material was installed directly on the existing wood soffit which had minimal/non-existing venting. From the exterior it may look fine....

If the fan termination is not the moisture source around the punched holes, it may be also be that the insulation is restricting the intake air flow-- depositing the water vapor from the air on the insulation (dripping onto the holes) as it replaces the attic air exhausted above. This may require soffit removal and sub-soffit cutting/enlarging to get the proper NFVA required for your square footage:http://www.airvent.com/homeowner/pro...it-specs.shtml The dark colored holes may have venting under them while the white ones don't-- blocked enough by wood soffit (existing previously) yet loose enough to admit some air/moisture in a right-angle pathway. Either case--- clean the venting for optimum performance after stopping the moisture.

Gary

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