Properly insulating a shed requires you to.
Shed floor insulation.
One of the drawbacks for spray foam is that you need backing for it to adhere to the surface.
This will be according to your shed plans.
Budget ability and experience also.
The best way to insulate a shed floor is in the building phase of the shed.
If you are installing insulation on a pre built shed you cannot simply drill a hole in the floor and pump it full of spray foam.
Insulating a shed will reduce damage to your stored tools equipment or boxes.
Access to the underside of the floor though affects the options available for insulating it.
There is a nice video below detailing how to do this easily.
I recommend foam boards as they can be cut to fit between the floor joists easily.
Measure the distance between the floor joists.
However having a layer of insulation beneath the floor boards will contribute towards keeping the contents of the shed toasty.
It can also make it more versatile allowing you to store plants or use it as a rec room.
Insulating the shed floor will help create a thermal barrier between the inside and outside air spaces.
Insulating the walls would be simple because they were exposed to the inside and insulation batting could easily be squished between the studs.
How to insulate a shed.
Warm air rises and so naturally the walls and the roof are the first areas to consider.
Figuring out how to insulate the shed floor one of the most challenging steps to the project was figuring out how i would insulate the shed floor.