Spray foam around roof penetrations?


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Old 07-03-24, 05:34 AM
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Spray foam around roof penetrations?

I know this should be easy find, but everything leads to more advanced insulation discussions. I'm going to be sealing up ceiling penetrations in my attic. I know what needs to be done. However but I'm just wondering if I should spray foam around all vent and exhaust pipes that go through the roof and exterior walls in my attic?
 
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Old 07-03-24, 05:39 AM
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Your attic is unconditioned, ventilated space. There's really no point in air sealing anything other than the ceiling.
 
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Old 07-03-24, 07:24 AM
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Thanks. Simple and straightforward! I will get to work, in the Fall.
 
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Old 07-03-24, 08:04 AM
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The only time I have spray foamed penetrations through the roof is if there is a problem with wind driven rain. All pipes and wires passing from the conditioned living space into the attic should be foamed or caulked to stop all airflow. Depending on your location code may require using fire rated caulk/foam to seal those penetrations.
 
 

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