I have an older mobile home and i would like to add insulation to the inside walls

Question

Is it possible to add foam insulation board to the inside walls without removing the inside paneling? I am thinking of insulation that would be 4 ft X 8 ft X 3/4 in. (in thickness) sheets of dense foam insulation applied to the inside walls and new paneling placed over the insulation

Answer 1

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Answer 2

Adding insulation to the inside walls is actually going to make it more difficult for the HVAC to control the temp of the house.  Room to room airflow is important for keeping a consistent temperature and heat actually goes through the walls.  Insulating the inside walls will do nothing to decrease energy costs and will be a waste of time and money.  If I were you, I'd spend that time and money on insulating outside walls and sealing the roof, windows and doors.  Seriously, no heat escapes or enters the house from the inside walls.

Ok, so may you are insulating for sound purposes.  Walls aren't just hollow.  There is usually a stud every 16 inches that would prevent you from doing this.  There is also the matter of what's called the top plate, which is another couple of 2x4s that runs the length of the wall on top.  There are companies that will drill holes into the top plate and use a machine to spray foam into the walls, but this is a very tedious process and impossible for a mobile home, seeing as how there is no attic access.

Answer 3

I think it would be cheaper and less intrusive  to add the insulation to the outside - though lots of work if you try to salvage the existing exterior sheathing.  I also think that 3/4" foam insulation won't help enough to make it worth the effort.

I remodeled an old mobile a few years ago, stripped off the aluminum, screwed 2 x 2s to the 2 x 4 studs, added 1 1/2" closed-cell styrofoam insulation, and resided it with vinyl siding.  The next year I pulled the old panelling off the inside, stapled up 6 mil vapour barrier and 1/2" gyprock for fire safety.  It looked great.  I slept better -- and when I sold it, it was a lot easier to sell and for a lot better price.

Good luck