Liquid screed expansion joint

[WWilts]

How to make an expansion joint work with liquid screed?
Without any of the screed going down under the insulation?

 

Buildup:
Concrete slab
Blinding
DPM
100mm PIR insulation
Polythene
UFH pipes
50mm liquid screed

 

Expansion joints separating UFH zones (door thresholds).


 

[jayc89]

Ours were stapled into the insulation after it'd been taped and covered in polythene. Once the screed when off, the majority pulled out pretty easily.

[Thorfun]

Our screeders told us to cut the expansion joints to length (we used 5.5mm plywood board) and leave them beside the doorways and they added them as they went around. 
 

we weee also told not to remove them afterwards but to trim down to screed level. 
 

 

here’s a photo of one temporarily in place to ensure it fit but was lifted out for the pour and the put it in.