ᐅ Garage-carport combination as a timber frame structure with sandwich panels

I am planning to build my garage with an attached carport this year. The garage will have two rooms (garage + workshop) with a height difference of 30cm (12 inches).
Directly adjacent to the garage, there will be a carport ending on a wall. The roof will be continuous.

I am considering building the garage using sandwich panels (with a wooden substructure). The advantages are insulation and easy assembly. No external or internal plastering is needed.

The workshop is intended for use in winter, so insulation is important. Heating will probably be electric or an air heat pump.

A photovoltaic system will be installed on the roof.
For the foundation, two concrete slabs will be poured (on strip foundations) with a height difference of 30cm (12 inches) to help even out the slope.
I am currently working on the detailed planning.

The strip foundations and concrete slabs will be done as self build. The wooden structure will be contracted out (mainly because of the roof length of over 11m (36 feet)).

Current questions:
- Insulation of the concrete slab for winter use. Is a complete floor build-up including screed necessary?
- Heating – air heat pump without underfloor heating, or electric heating in the floor (simpler but less effective).
- Practical mounting of photovoltaic panels on sandwich panels (using a mounting system or not). Some panels should also be mounted on the south-facing vertical wall (perfect south orientation).

Maybe someone has some input, as it’s hard to think of everything. The building permit / planning permission is currently in process.

Is this a boundary line construction? Is this even allowed for a workshop?

Hello kbt09, no boundary construction, everything is within the building area and at least 5m (16 feet) away from all property lines.
Regards, bigborre

How much do you want to heat the workshop? Continuously or just every other Saturday afternoon?

We heat our garage/workshop using a gas cylinder. In winter, it’s usually only in use on weekends at most. For that, it’s more than enough. Saves money!
I can’t say much about the rest.

Evolith schrieb:

We heat our garage/workshop with a gas cylinder. In winter, you’re usually only there on weekends at most. For that, this heating is more than enough. Saves money! I can’t say much about the rest.

Thanks, good input. I’m also concerned about frost protection because I want to install a washbasin. That would need to be automatically controlled.