Higher R value vs lower with foil face


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Old 02-21-22, 04:10 PM
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Higher R value vs lower with foil face

What would you say is more important? For $35 I can get R10 foamboard or for $22 I can get R6 with a foil face. Less R value but would the reflection make up for lost R or is there no real way to calculate the different factor? What would you go with for garage ceiling . don't want to use drywall.
 
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Old 02-21-22, 04:18 PM
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You would likely need to use foam that is class A fire rated, such as Thermax. I doubt either of the products you are looking at are. Fire resistance is the chief reason drywall is primarily used.
 
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Old 02-22-22, 05:27 AM
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I use propane to heat my garage and it produces a lot of humidity. Ive had insulation get soggy and fall many years ago at a different home and I feel the same will happen to drywall.
 
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Old 02-22-22, 06:20 AM
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You need to have some ventilation, unvented heaters as you experience create a lot of moisture.

If it's painted it wont be a problem, otherwise a potential fire hazard.
 
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Old 02-23-22, 07:11 AM
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There is currently no ridge vent or soffit vents. Are you talking about painting the drywall if so both sides or just the side facing down?
 
 

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