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Seal around dryer vent wall penetrations

Curious if the vent pipe exits through the wall to the exterior or into a garage?

Pc1
 
Exterior wall section of IRC will tell you that all exterior walls are required to resist the flow of water into the house. Energy code will also require the resistance of the free flow of air through that same wall. If there is a penetration of any sort it would also be required to be sealed in the annular space around the pipe or vent between it and the wall to stop moisture and air from entering the building.

In addition, a dryer vent must have a self closing louver or door and no screen/lint trap.
 
Daddy-0- said:
Exterior wall section of IRC will tell you that all exterior walls are required to resist the flow of water into the house. Energy code will also require the resistance of the free flow of air through that same wall. If there is a penetration of any sort it would also be required to be sealed in the annular space around the pipe or vent between it and the wall to stop moisture and air from entering the building. In addition, a dryer vent must have a self closing louver or door and no screen/lint trap.
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Hi,

I tried searching for the specific section of the 2009 IRC code that mentions what you said and did not find it. Do you happen to know which specific section of the 2009 IRC code? Thanks.
 
Yes and it is a new construction, completed in Sept 2012, and we are noticing issues which the builder is reluctant to fix.
 
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