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Question DetailsAsked on 9/3/2016

Why is water is leaking through an air vent in the ceiling in house without AC on the ground floor after mild rain?

Is it the vent pipe or the roof or the line? Checked the attic and it is dry.

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If the vent is open into the floor joist area (no ducting to roof), then likely a case of window leak or missing siding leaking into the second story subfloor and coming out the downstairs ceiling vent.

If this is a powered vent with ducting to the roof, could be a leak around the vent hood running down the outside of the ducting to the fan, then out the grillage - or could be a missing vent hood or cap or a stuck-open flapper in the hood letting water splash in. Since you say occurring in mild rain, I would guess more likely a totally blown off hood or cap on the roof, or a leak around the hood. Rain getting into the hood through a stuck flapper usually only occurs in very heavy rain (with a lot of splash) or blowing rain driving intot he hood opening.

Normal vendor to track this down would be a Heating and A/C contractor (your Search the List category) - or alternatively if you have a Handyman you have confidence in, then him.

Here are a couple of similar previous questions with answers which might help too -

http://answers.angieslist.com/During-...

http://answers.angieslist.com/Water-c...

Answered 2 years ago by LCD




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