Basement insulation, poor planning


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Old 11-17-23, 04:49 AM
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Basement insulation, poor planning

I should of given this more thought before I started. The home builder already had insulation attached to the top half of basement wall. Secured to treated strapping along the bottom. At first was thinking that would be adequate since the rest of wall is underground. Now I think I would like to add more insulation or at least a vapor barrier. Not sure of the best way to proceed from here. Thinking I should of removed existing insulation and filled the cavities with faced insulation. Any ideas?

 
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Old 11-17-23, 05:06 AM
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Vapor barrier below ground is not needed. Best is foam glued to the concrete and seams taped to create a thermal break and then the stud wall inside that can be insulated or not.
 
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Old 11-17-23, 07:48 AM
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So if I was to work in some 1 1/2" rigid foam board insulation and glue to cement wall, tape the seams including between the foam board and existing insulation, I would be good?
 
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Old 11-18-23, 07:36 AM
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Yes.
 
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Old 11-18-23, 03:32 PM
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What do you think if put in mineral wool insulation on the lower portion of the stud cavity, over lapping a couple inches with existing insulation. Would that work as well? At this point that would be the easier method.
 
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Old 11-18-23, 03:47 PM
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It would work. The foam on the concrete would be better - you won't get the thermal break with just insulation in the stud bays.
 
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Old 11-26-23, 04:47 AM
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I am in the process of adding foam board insulation. I was able to work in 4' x 8' sheets sideways, then added a 2-3" strip and sealed the joints. Would of been much easier if I did that first.

R-Tech 1 1/2 in x 48 in. x 8 ft. R-5.78 EPS Rigid Foam Board Insulation 320817 - The Home Depot
 

Last edited by LLLlloyd; 11-26-23 at 04:48 AM. Reason: grammar errors
 

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