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-   -   bath fan roof hood creating ice dam (http://www.diychatroom.com/f80/bath-fan-roof-hood-creating-ice-dam-193602/)

jonolsen 01-08-2014 08:02 PM

bath fan roof hood creating ice dam
 
I remodeled my bath a couple years ago and thought I was being wise by installing a vent fan. I went through the roof with it using a common hood that directs the moist air right on the roof creating a big ice dam! It's very cold here in northern Minnesota!! Is there something different I can use on the roof that is higher to help this problem?

gregzoll 01-08-2014 08:09 PM

It will always do that, due to the warm moist air, is reacting to the cold pile of snow around the vent. You need a Roof Rake, to get the snow off of your roof, to stop it. Also making sure that your bath fan has a self closing damper on it, to not let house air out through the vent, when it is not running.

jonolsen 01-08-2014 08:51 PM

Thanks for the info. There's been times when there was no snow on the roof and this still happens!! Isn't there a different type of hood,pipe, something that will let this exhaust up higher and not right on to the roof?


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