Originally Posted by Waterrat10
What about Vacuum insulated panels
They are Great...R30 for ONE INCH...but...there is a Big But...
They can cost you almost the same as Aerogel for a normal Box but a bigger issue is their propensity for them to fail. Once they fail your R-value goes from 30 to 2...and as they say in Mexico
, "aye mucho problemas amigo, no tiene hielo hoy".
R-Parts sells them
I have seen many boats with Vacuum panels
ripping them and redoing their boxes after a failure. I just wouldn't trust them personally on my boat.