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Community and Q&A

Vented crawlspace rim joist insulation

ChrisInIllinois | Posted in Energy Efficiency and Durability on

At some point I plan to encapsulate my vented crawlspace, but atm It seems it might end up year or so before I do it.

I cant seem to find info if it is okay to cut and cobble or spray foam the rim joist for air leaks, etc.. or if it would even matter if the crawlspace is still vented.

It seems it would still let air leak in to the walls, so it looks to be worth doing.

Can you seal/ insulate a vented crawlspace? or will it cause issue should it not be encapsulated?

Feel free to shoot me articles or books, or keywords to look up.  
Thanks again for the info.

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  1. Expert Member
    Peter Engle | | #1

    There's not much point to sealing the rim joist area in a vented crawlspace. There IS value to sealing the floors between the crawlspace and the living space, and part of that is any penetrations for plumbing/wiring, etc. There are a lot of these penetrations in the rim area for utilities going up into exterior walls.

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