Which building blocks for heated garage?

[plan-g]

No, you go down with the cell plastic all the way to the crushed stone bed, so there are no problems.
It looks nice with a whole facade..

Consider winter measures, hot water but not too hot water when mixing the mortar, and if there's night frost, cover all the masonry with tarps, including the blocks you are going to use..

The idea was thick stucco similar to the main building.
Does it work on cell plastic?

 

[Plupp 405730]

The idea was thick rendering like the main building.
Does it work on cellplast?

Yes, it works well, then you can smooth the plinth and apply rendering to the facade..

 

[Slarvpellen]

I built with Finja's insulated block base, unfortunately, they seem to have been discontinued. They were a cost-effective option between the Exakt system and uninsulated lecablocks. Can't find a similar variant so I would probably choose to either spend the money on Exakt or equivalent from another manufacturer (seems to have the same price range roughly) or go with uninsulated leca without any additional insulation. If you look at u-values here and compare: https://www.finja.se/storage/ma/2cf...DDABB893241F/Tabeller U-värde Block_SO_sv.pdf

It seems that uninsulated blocks at 250mm+ are quite okay in a garage that is heated occasionally.