Spray foam Insulation Under Cab

I also have the exhaust close to the floorboards, but my pipes have exhaust wrap. I don't notice heat from the floorboard, but I definitely feel heat coming off the doghouse. I am thinking of putting in some flexible hose to get a ram air effect when the rig is moving and help move air around the engine/headers.

I would recommend you try some pipe wrap first and see what kind of results you get. The next thing I would recommend is a header blanket. That would be intended to take the high exhaust heat and seems more safe to me. Spray foam will stick to everything it touches, possibly hold moisture and cover up wires/hoses, etc. A header blanket could be tied into place with some galvanized wire and easily removed if you need access in the future.

Jose

DaHose wrote:
How would filling the space under the cab with foam help air flow?

Jose

Don't think improving airflow is the objective. I am thinking the purpose of the foam insulation is to help with the heat generated and coming up from underneath the floorboard. My Class C floor gets really warm.

How would filling the space under the cab with foam help air flow?

Jose

You probably have the correct forum. Give it some time and someone will reply.

Can anyone recommened the best forum to post this in?