On Oct 15, 4:05 am, wrote:
Live in 60 year old 1300 Sq Ft single story brick house with full basement,
it has recent 600 Sq Ft addition with about 3' crawl space. Live in Michigan
(zone 5) and winter heating bills are a killer. My basement is very cold and
drafty in winter...in dead of winter temp check showed around 37
degrees...I have hot water heating too by the way. The House came with newer
Anderson windows and two years ago I blew cellulose insulation into all
walls that were not insulated...also added about 6" in attic....so total of
about 12" of cellulose there. Oh and I also did my best to caulk everywhere
possible in basemen last winter, but seemed not to help much.......I have
noticed that the inside walls of basement are like ice cold to the touch
too. would it be worth while to dig down a couple of feet and insulate the
outside of basement and crawl space?? If so how to do it? Any advise
appreciated...

You do not mention how much insulation you have in your floor?
Remember heat always moves to cold, that means down as well.
What you need is to disconnect your inner living space from the main
structure of the building.
That means lining the inside of the whole of the exterior walls, the
top ceiling and floors with two inches of polystyrene or similar to
stop the cold bridging of your existing insulation.
There are probably lots of places where the inner walls are in direct
contact with the outer shell.
It is these points where the heat leaks out.
Perry