sliding door threshold detail with external wall insulation?

[Ed_]

I'm struggling to find a good way of mounting my sliding doors, given I will have 100mm of external wall insulation as the outermost part of my wall buildup:

 

I think the door track needs to go over the concrete slab, for strength, which leaves me struggling to protect the 100mm of external insulation. An extended sill seams like the best idea, but I can't really find any of these being offered, perhaps i'm not looking in the right places?

 

As drawn i'm envisaging a wide sill that bridges the concrete to over the insulation, sat on compacfoam for a bit of strength to spread point loads, with the sliding door track set ontop of that. However I can't find suitable sills and i'm not sure if this arrangement would still put undesirable forces through the external insulation, for example when someone steps on the sill.

 

Are there any other ways that don't introduce big thermal bridges?

 

[Redbeard]

Any metal fabricator should be able to make you what you need. Try EWIStore: https://ewistore.co.uk/shop/external-wall-insulation/cms-810-120/