Radiator pipes in screed floor

[Camlew]

Hi all,

I have recently had a radiator in my living room moved.

The plumber has wrapped the pipes in duct tape only and told me this was sufficient - should I wrap the duct tape in denso tape (or the Screwfix equivalent), remove the duct tape and then denso tape, or stop worrying and leave it as it is?

For screed is there a minimum height of screed recommended above pipes? I am a little concerned that at its highest point there will only be approximately 20mm of screed above the radiator pipes (most of it will sit with about 35mm of screed above it)

Thanks