With that said you have limited space in the walls.
Best insulation for bus.
The insulation will have a reflective side facing towards the interior of the bus.
Polyiso foam board insulation is the best skoolie subfloor insulation even better than.
My first thought was spray foam one step yet my understanding is that it can be acidic to the metal breaks down.
Fibers are created by molting hot glass through miniscule hole creating a thin fiber think cotton candy.
Just letting yous know.
Spray foam is the go to insulation for school bus conversions.
There are other options as well i ve seen people use denim or fiberglass insulation for instance but the best bang for your buck is going to be the first two options.
The best skoolie insulation 1 spray foam insulation.
Foam board would be an affordable option with very good r value as well however when on fire it creates toxic gas that is lethal.
This is because of the many.
For our bus we used a thermal break a thin piece of insulation foam between our ceiling wall and pieces of wood.
I will then cover the insulation with something like a lexan flexible panel material.
2 polyisocyanurate foam board.
But after some research i read that celotex is in pir polyisocyanurate which provides one of the better insulation its true but only in warm temperature.
So i m trying to think of how to best insulate them.
I ve seen these types of insulations used in so many bus and van applications but one of the most forgotten aspects of this installation is the air gap.
Before choosing which foam you want you ll need to screw in a thin piece of wood on the metal supports of your bus ceiling and on the walls.
You say that the celotex panel has the best or one of the best lambda value in any insulation.
Sheep s wool is a sustainable product that insulates well naturally manages moisture and condensation and even helps purify the air in your van.
For either option you ll want to attach wooden furring strips to the bus first then insulate out flush with the furring strips.
In our opinion the best all around material for van insulation is sheep s wool insulation.
Fiberglass insulation is created by fusing natural sand and recycled glass together at high heat.
You can either use fiberglass or 1 5 2 pink insulation board which has an r value of 6 9 depending on the thickness you can use stuff in there.
Spray foam was the best r value for the space but would have cost about 1000 eek.
Reflective surface insulation essentially plastic bubble wrap with an aluminum polyester coating can be used to block 90 of radiant heat.