This mainly concerns: how do I keep it cool inside, and how do I reduce the noise level.
A difficult object to insulate with all its thermal bridges.
And even if you insulate everything, including the bottom, rear doors and front doors, you still get to only 50% of the total surface.
Of course you do, but a small ceramic heater will keep you comfortably warm in no time.
To keep it cool, purchasing a white or light-colored van is the most efficient.
In addition, moisture is the great enemy of the bodywork and incorrect insulation can even have the opposite effect.
Maybe we can give you some tips.
The walls are currently usually insulated with sheep wool.
This is moisture regulating, does not irritate and ensures a good indoor climate.
Apply sheep wool with spray glue directly to the outside wall.
Good sheep wool is sufficiently stable and will not sag.
Our camper is also insulated with sheep wool and you could smell it at higher temperatures.
This became better during the season, otherwise very satisfied.
Pay attention! What is insufficiently known, but should certainly be taken into account, is the following.
Slotted holes are provided in the lower part of the cavities of the walls.
Due to the shape of the bottom plate, outside under the bottom, a vacuum is drawn during driving.
As a result, air is drawn in through the slotted holes, and the air is removed from the heater / blower.
Be alert not to block this air flow with insulating material; this provides the necessary ventilation when driving, and keeps the walls dry and free of rust.
A campervan is used almost exclusively in the summer.
And in the summer the floor is the least warm part, so why insulate?
If you do insulate, be wary of moisture and only use material that does not absorb moisture.
You cannot stop condensation and materials such as flaked foam will eventually become full.
Once wet, you just can't get it dry again.
Will you use the bus throughout the year as a luxury passenger car, delivery van and as a camper?
Then I prefer the following.
The metal floor is profiled. Plywood or concrete plywood is added to this.
Possibly finish with an easy to maintain layer, rubber, PVC or similar.
The interior is also attached to the plywood.
If the bus is used as a campervan, place a custom-made floor mat on this floor.
Practical as a van, comfortable as a campervan!