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Ice Dam - how to vent?


Posted by Dave on August 18th, 1999 11:46 AM

Every winter I get an ice dam in the valley where two gables come together. // I'm planning on cutting open the kneewall to make sure there is airflow along the roof rafters - but there will not be any flow from the outside. How can I get the temperature in this crawlspace equal to the outside temperature? Should I add roof vents at this level?

/
//\
// \ /
// Vent //\
//______\ // <-- attic
// \ //____\
// \ // \
// \ // \
//| |\####//| |\
// | | \##// | | \
// | | \// | | <---kneewall
//-----------------[short ]-------------\
[gutter]
| |
| |

### - is where the water & ice form. Should I add roof vents here?

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