In floor heat insulation

[bmxer883]

So not a garage but wanted some advice. So this is a basement thats in ground. My issue im concerned about is there's no perimeter insulation and nothing on top of footer. Problem is we only have 4in to what the top of concrete needs to be so.if I put 1 or 2 in of insulation on top my concrete will be thin. Also there's a spot with no insulation and that's cause the concrete needs to be thicker. And it's all rock so hard to dig out any more how bad is that not having anything.

 

[chinboys]

dig around the outside of this room to 3 feet at the exterior perimeter.
install 4 inches or rigid panel insulation vertical to the 3 foot height.
install 2-4 inches of rigid insulation parallel to the bottom of the hole.
backfill.
you are trying to prevent the heat of the interior slab from wanting to transfer by conduction to the outside ground.
heat always moves from hot to cold.
and try to insulate the interior floor from the vertical interior concrete block wall (you don't want thermal bridging)