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Old 07-28-2013, 10:59 PM   #16
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vapor barrier


So, you are in China.... And asking about v.b. in basement... No vapor barrier plastic below grade- hot or cold, IMO; http://www.buildingfoundation.umn.ed...jectReview.htm

Another link w. a v.b. poly and the problems created, pp. 26-32; http://www.buildingscience.com/docum...study-analysis

You could use a thick foamboard above grade/3' below-grade, and none below that down to the slab. Moisture is not a problem with the exterior drain membrane, only insulation value (and rain/snow moisture from exterior above-grade concrete wall portion). The slab will be 10-11*F warmer at that depth due to earth warming than surface temperatures. The need for lower heat loss diminishes with depth; http://www.quadlock.com/technical_li...Insulation.pdf

The figures given where for the temps of the inside face (cavity) or Delta T- figuring outside temp averages minus 68*F inside temp times R-value percent of cavity insulation= condensing temp. = safe relative humidity percentage w. no condensing anywhere.

Gary

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Old 07-30-2013, 02:17 AM   #17
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vapor barrier


Thanks Gary , for the response. It has been a challenge i must say. I am trying my very best to provide an ideal system that i can easy use and have great success. I may have gone over kill on the dimpled membrane on the interior concrete walls but because of the exterior wall having no waterproof membrane i have noticed most basements have large amounts of moisture and wet walls so i wanted to protect the interior by adding this type of method . The only problem i face is what type of insulation method i should use that allows me to have a dry humid free basement, Some have suggested to apply a xps foam board instead of batt but how would i be able to apply it i can glue or fasten it to the membrane. or do i just apply the foam board then the metal wall in front to hold it in place? or just stick to the batt. Like i said im trying to find a easy but functional system
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Old 07-31-2013, 09:42 PM   #18
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vapor barrier


Sorry, I got confused and thought the drain mat was exterior. With that in mind, the foamboard should adhere to the d. mat for the R-value directly against it to prevent cavity condensation there. On the drainage mat as it is around R-1 or so. Fig. 27; http://www.buildingscience.com/docum...sure-guideline

Gary
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Old 07-31-2013, 10:19 PM   #19
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vapor barrier


Thanks Gary , I dont think the foam board will work for me at this point because one issue is that the concrete walls are not straight and will have a difficult time to avoid air gaps , I also thought of this but because of the dimpled membrane on my wall i just cant use foam board. I do know that in the future thats all i will use . I forget about the dimpled membrane . the question i still have is do i allow a double vapor barrier or not mmmmm still no concrete answer
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Old 08-05-2013, 11:36 AM   #20
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Foamboard can be installed in thin layers (following irregular walls), built-up to give enough insulating value to prevent condensation, no interior vapor barrier poly next to drywall. Figs. 1 & 7; http://www.buildingscience.com/docum...bout-diffusion

Gary
PS. stand the frame walls plumb, making up any gaps with compressing the fibrous cavity insulation.

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Last edited by Gary in WA; 08-05-2013 at 11:39 AM.
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