Quote:
Originally Posted by estelle bus
I was reading some technical specification sheets on one of the common rigid insulation board that people use. I noticed that one of them said it needs 3/4 of an inch to 3.25 in of dead air space the question is is it better to have one and a half inch of insulation with no air space or 1 inch of insulation with some airspace? And for your walls and ceiling which side should the dead air space be on?
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You are reading specs that relate to standard construction methods, where an air-gap forms part of the overall R-Value of an installation.
In a bus there isn't room to incorporate those gaps. Don't worry about it.