You can achieve a better level of insulation in the van by batoning out the shell fitting thicker insulation in the van and then plying over the insulation.
Camper van roof lining.
Although there is an extra step in lining the van with plywood first in the long run i think it gives a cleaner finished product.
Your camper van insulation and ventilation is integral to the comfort level of your van life.
There are other advantages to the fully ply lined van also.
Many camper conversions add a vapour barrier over the top of the insulation and before lining the walls and ceiling.
Trim fix high temp adhesive 500ml van lining glue 12 pack 12 x cans of trim fix high temp adhesive 500ml van lining glue ideal for use in vehicle trimming applications e g.
The 7mm liner is a thermal equivalent to 100mm of glass wool.
When choosing the best campervan roof vent for your setup consider.
This will prevent any water vapour not ventilated making it.