Hi Glen
Congrats on the new home and wishing lots of luck with your new garage.
Lots of great comments and suggestions for your new garage.
We did a lot of wrenching on our race car at a friends place in Langley and vowed not to work on cold floors or a cold garage.
Here is what we did for our garage which we build in 1992. Dimension are W27'x D28'x H15'.
Build the foundation so I could pour floor and foundation at the same time, (mono-pour) one pour vs two.
When I formed up the foundation I insulated with (R10) 24 inch wide vertically with PT 2x3 installed between each vertical piece of insulation. The PT 2x3 are used as nailing strips for the sheet metal afterwards.
The concrete slab was also insulated with (R12).
The exterior insulation was covered up with painted 26 gauge sheet metal.
Radiant heat pipes were placed on 6 inch centers, more water in the system the less often the the boiler or in my case hot water tank would cycle on and off. I used the hot water tank because it was/is much cheaper that a boiler and if you do the insulation right and sweat the insulation details you can minimize the heat loss. Except when the overhead door gets opened. But because of the mass of heat in the floor it doesn't take long to get warm in the garage.
The other type of heating system that I considered was the ceiling mounted gas fired commercial hot air blower. I didn't like the noise from those units.
Hand framed the roof in order to get a vaulted ceiling, used collar ties to provide an area for storage. One could also use an attic truss.
Wood frame was all 2x6 which was insulated with R20 fibreglass batt.
Used 2" and 1" conduits for both air and for electrical have 200 amp panel.
Brought in cable and phone lines .(No internet back then.)
Have water which is a frost free set up for outside. Used plywood in lieu of drywall on several the high traffic. Also makes electrical changes easy as well as mounting
Lighting was fluorescent strip lighting installed on every collar tie.
Natural light via 1'x1' glass blocks and 2'x4' skylights.
Overhead garage door was a 22' steel insulated with a 1HP motor.
Made my own overhead door weather stripping as I have never liked the ones that come with the door package.
Man door steel insulated as well.
Installed an alarm system and of course the all important fridge.
