Doubling insulation

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Old 10-03-19, 03:37 AM
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Doubling insulation

81/4" cathedral ceiling depth
 
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Old 10-03-19, 04:31 AM
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OK... What's your question????????????????????????????
 
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Old 10-03-19, 04:47 AM
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I'm guessing your question is about the amount of insulation that can be placed in a space 8 1/4" high. If so, the answer is 8 1/4". Placing more insulation isn't only worthless but compressing insulation reduces it's effectiveness.

Not all insulation is equivalent, though. You may be able to increase the insulation's benefit by using a type of insulation with a higher R-value. For example, foam insulation can be superior to other insulation materials.
 
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