Regular insulation batting, with plastic sheeting tacked inside of that for vapor barrier. Please do not put flammable material under the house! Especially if you have hot water pipes, a furnace or hot water heater, or even forced air ducting under there. Big fire hazard!
Button up all the air leaks and add a combination of heat trace tape and pipe insulation to the piping that seems to freeze most often. In a lot of trailers, that is at or near the kitchen sink. and the line leading to the bathroom(s) and usually the outdoor spigot too.
And get ambitious, spend some extra dollars and effort, and replace that old copper tubing with PEX instead.....but insulate as well. Every dollar you spend in insulation will be money saved in heating bills, might even pay for itself the first winter.
Button up all the air leaks and add a combination of heat trace tape and pipe insulation to the piping that seems to freeze most often. In a lot of trailers, that is at or near the kitchen sink. and the line leading to the bathroom(s) and usually the outdoor spigot too.
And get ambitious, spend some extra dollars and effort, and replace that old copper tubing with PEX instead.....but insulate as well. Every dollar you spend in insulation will be money saved in heating bills, might even pay for itself the first winter.
