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/

[craig]

That detail for the sliding door sitting on compacfoam over the insulation and partly over the concrete slab isn't substantial enough, I'd be concerned with the point load over time and potential operational issues occurring. Sliding doors need a solid base to sit on over the entire depth and needs to be level. It can sit on structural insulation but it needs to be done right, part of it is sitting on insulation and that's asking for problems. How's the threshold being fixed in place, how is it be packed (if needed)?

 

[Nickfromwales]

2 hours ago, craig said:

That detail for the sliding door sitting on compacfoam over the insulation and partly over the concrete slab isn't substantial enough, I'd be concerned with the point load over time and potential operational issues occurring. Sliding doors need a solid base to sit on over the entire depth and needs to be level. It can sit on structural insulation but it needs to be done right, part of it is sitting on insulation and that's asking for problems. How's the threshold being fixed in place, how is it be packed (if needed)?

 

Current MBC PH TF project is all Norrsken, and they are all going to be completely off the slab and atop the EPS with 20mm of (Compacfoam) CF200 set in situ to take the loads (biggest slider is <4m iirc).

 

Same on last few with raft founds (Rational and Velfac) with zero issues tbh.

 

I just asked the installers to go all-in on the side and head brackets, and made sure the CF or Bosig is set down very robustly. Threshold can be strapped too if needed, but by the time these are set down onto foam and CT1/other, the sheer weight stops these things from moving about at all.

 

[Alan Ambrose]

Won’t the eps / compactfoam compress with the load tho?

 

i should say I have a similar detail coming up, so I’m v interested in a robust solution.

Edited 2 hours ago by Alan Ambrose

[mjc55]

yes, I will have a similar construction and was considering Thermablock as a solution.