I have the ground floor apartment in a 100 year old triplex on the plateau in Montreal. It's an 800 sq foot apartment with baseboard electric heaters and I'm currently using over 110kwH per day to heat the house. Having compared the bills from the previous 2 years which I got from the last owner I can see this is not just down to how the heating is being used. The 2 apartments above me have significantly cheaper heating bills.
In the 18 inch crawl space under my floor I can see there are 3 baseboard heaters. I have turned the thermostats on them down but having researched online it seems the recommendation is that the crawl space should be insulated.
The ground is rough and unfinished and last year we had a new moisture barrier installed. There are water pipes in the crawl space but no machinery. I have looked at options for insulating and it seems people are saying it's better to insulate the crawl space rather than just the floor.
To insulate the crawl space I am thinking I need to use rigid foam insulation on the walls, and on the floor above the membrane. Does that sound right? Is it ok to use rigid foam over the membrane/vapour-moisture barrier? Is it reasonable to crawl on the rigid foam without it compressing too much?
I can't find much information about insulating the ground but as it will always be below room temperature it seems like it is necessary. Interested to hear any thoughts about how to go about this and what thickness of rigid foam I should be looking for.