I'm wondering how the R value is measured in the floors of the Bighorn. It seems I don't have any insulation under the floor of the Bedroom area. We've had some cool temperatures (26 degrees) the last couple nights and the bedroom floor is cold. I will probably end up cutting styrofoam strips and glue them between the aluminum joists that are exposed in the storage bay area. I must add, we have been using a small electric heater in the main area of the coach and it is pretty easy to heat. Just that *censored word* bedroom floor.
I realize this is an old thread, but as I stumbled across your post, my curiosity went through the roof as I'm a new owner of a 2010 Bighorn 3670RL. I have not winter camped, of course, as I just purchased the unit a month back, but was determined to find out as I don't won't COLD feet, either!
So, I took the duct work running to the register in the basement off, then went inside and removed the two screws and removed the entire vent register and housing exposing the contents of the bedroom floor.
What I discovered under the carpet:
-Padding
-Plywood
-2 1/2" of styrofoam!!
-another layer of plywood which is the top of the basement floor that is seen from outside.
This is a 2010 model, so I'm not sure about previous models, but the new ones appear to be insulated.