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Old 09-08-2009, 11:45 PM   #1
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Insulating Band Joist


I'm removing all the old wood paneling from my basement walls and thought it would be a good time to seal my home a little better. I have a question about band joist insulating. I've seen different methods and want to see what you prefer. I don't really want to just stuff batt in there and call it good. As for spray close cell that seems really costly for me right now but I know its most likely the best. What would you think about just using the Great Stuff and spaying a couple of inches in there just for the air seal then using batts. Other idea would be to cut ridged foam to size and use foam adheasive and fit into place and then seal the edges around with the Great Stuff spay. If you have any other suggestions im opened up to hear them. Thanks in advance

Holt

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Old 09-10-2009, 07:04 AM   #2
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Insulating Band Joist


The rigid foam would be my choice.

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Old 09-10-2009, 07:51 AM   #3
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Insulating Band Joist


http://www.buildingscience.com/docum...ion/#Figure_01
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Old 09-10-2009, 04:49 PM   #4
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Insulating Band Joist


Yep. http://www.rd.com/57548/article57548.html
Be safe, Gary
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Old 09-10-2009, 06:35 PM   #5
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Insulating Band Joist


I did my rim joists with rigid styrofoam, pink stuff 2 inches thick, used a few screws per foot to anchor the foam blocks to the rim joist, then filled in the gaps between blocks with Great Stuff. Seemed to work well. You should check with the building inspector to make sure the approach you select meets code in your area, in some locations you need to cover the foam with fire resistant sheet rock.

Sprayed in foam is often cited as the best method, however it is messy, and may not be a DIY project. Rigid foam cuts perfectly on a tablesaw by the way, and as you suggest you could attach it to the rim joist using an adhesive product.
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Old 09-10-2009, 10:07 PM   #6
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Insulating Band Joist


If you go the adhesive route... you might want to make sure the glue will not eat/melt the rigid foam, some adhesives will.

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Old 09-11-2009, 07:39 AM   #7
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Insulating Band Joist


Hey, Thanks for the reply's. Sounds like my idea was pretty much what everyone here does. Building code here says 1/2 gypsum over any foam for fire which is what every artical I've read so far dictates to do. Looks like I have a plan now and all I need is someone with a truck to help me carry those huge foam sheets home.
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Old 09-11-2009, 01:40 PM   #8
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See if they will rip them for you at the box store, into twice the rim width- or fit into car.
Be safe, Gary

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