Has anyone tried retrofitting with “Gapotape?”
My brother in law is retrofitting after his builder installed PIR board and they got into an argument, some of the sheets are falling out and most of the stuff is nailed in (apparently there is even a technique to “nail it” properly according to some videos online, why is that even a thing?) and the space between the rafter and board is huge. He’s not reinstalling the insulation but instead is doing it himself and putting this foam tape around the sides called “gapotape”, that attaches like a band aid and expands in and out over time, they don’t have much stuff online besides an animated YouTube video so I was wondering if anoyone has heard of it and knows if it works or not? Also how long does it take to apply and should I just tell him to do something else or get the whole thing redone maybe even with a different type of insulation? Any reply helps, cheers guys.
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