Good day all, John here in upstate NY, I hope this finds all happy and healthy. I starting my van build ( 09 F250) up top, insulation, lights, speakers, fan and prep for solar. I've watched most of the YT videos but little time is spent talking about how to attach the insulation. I did see double sided tape, my question is whats the best way. Right now the plan is 1/2 inch celotex with the double sided tape to ceiling then thin ceder tongue and grove planks. Am i heading in the right direction? Your input will help greatly.