How would you support tile hanging over 100mm of EPS

I am thinking of hanging vertical 47x50 battens from the roof rafter feet long fixings at 1.4m c/c recessed into green EPS, membrane and horizontal barrens at 120mm c/c for plain tiles.

Will that work?
What to at the bottom?

What is "green EPS"? Do you mean grey?

I'd suspect 1.4 m separation for the vertical counterbattens was a bit large. What support is required for the weight of your chosen battens and tiles? Maybe you need a larger section cross piece between the rafters to enable a closer spacing?

Also why bother embedding the counterbattens? Isn't it simpler to just put them on top of the EPS?

At the bottom it depends what you've got underneath! Assuming it's rigid and not damp (e.g. brick plinth with a DPC) I'd be tempted to land the counterbattens on the plinth to provide extra support. If there's any sort of gap at the bottom then you'll want a rodent screen (wire mesh) although insects will still be able to get in through the tiles.

Thanks all

Re 1.4m that was the centres for the fixings in the vertical bearers

I agree with not rebating, I would do 100mm and 50mm between

Vertical centres to match rafter feet so likely to be 16”, 400, 450 or 600mm

I like shoes but in my opinion would need to carry load into the external leaf of the wall.

EPS breathable, no void, no water, any condensation on the back of tiles will drain outwards. No plinth as this is retrofit/replacement of tile hanging.

Lot of weight for hanging tiles at 60/m2 probably need to check with SE for fixings, I would a vertices fixed to the side of every rafter so more like 600/400 centres

Also consider:
Vermin and insect ingress at base?
Where will membrane sit?
Lots of changes to BR regarding “cladding” following Grenfell tower, I understand that the normal method of ventilation behind cladding is discouraged unless fire broken at junctions on with expensive breathable intumescent closures?

If the tiles are all hung on a timber batten that is fixed at the top, will that timber batten expand/contract differentially with the seasons and humidity (vs the masonry wall beneath the insulation), so a gap opens/closes at the bottom? If the batten is restrained at both top and bottom, would it be forced into and out of compression when it tries to expand/contact?

In practice the 1.4m restraints might be what's resisting the tendency of the timber to expand, so might need to be closer together.

Edit: Tom, I'd possibly misunderstood that the battens and counterbattens were to create a drainage cavity behind the tiles, which might need cavity fire barriers because it is a wall not a roof. Tony's comment suggests no cavity and no drainage are intended. Cavities don't have to be airtight to give a chimney effect, but cavity barriers do have to be fairly airtight to work correctly, as far as I understand it.

Could you fix them directly to the render with adhesive? Are there any brick slips that give the same look as tile hung?

Posted By: djh

Posted By: muddyCould you fix them directly to the render with adhesive?

I don't think there is any render?

There should be - if only to keep the mice out !

Wasps can make a lovely home in the void behind any cladding. EPS doesn't offer any resistance to wasp jaws. I have watched queen wasps investigating holes for nesting sites, with trepidation.
I've got to decide how to finish some EPS exterior wall insulation in the near future, so I'll try using render to fix the tiles, and some slate as well.