Membrane finishing

[Spinny]

Hoping to have the flooring peeps in soon. Wondering how I should prepare the various membranes poking out at the windows and bifolds. (See pics)

1. The window people put a piece of DPM under the bifolds and floor length window. They used double sided tape to stick it upwards against the inside edge of the frame/threshold on the inside. Naturally the DPM has pulled away from the tape and the tape has become gummed up with dust and crap and is no longer sticky. Should I scrape and cut the tape off the frame/threshold, and then what should be used to restick it ?

2. The floors radon/dpm membrane is directly alongside the window DPM. Thinking of sticking this to the window DPM, and then the floor levelling compound should run up against it when they pour it.

3. The black vapour barrier is then on the inside of the 25mm PIR edge insulation. Either I cut this off at the current floor level and it gets covered along with the edge insulation by the floor leveller. Or I try and cut it down to fold over the top of the edge insulation and then get covered, possibly sticking it too to the radon/dpm.

4. The window DPM has got  a short 20mm cut in it just outside the window - how do I repair this ?

 

Many thanks.