Sleeving pipes through slab

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I've run a bunch of pipework (Polybutene - PB) for central heating and hot water what will be under a concrete slab and while most of them are insulated and inside some waste pipe offcuts to protect from expansion etc, there are a couple I forgot.

Rather than having to drain and re-plumb I was thinking of insulating the pipes and wrapping them in some flexible plastic (sealed with zip ties and gaffer for the joint) or just duct tape the insulation.

Does this sound like a stupid idea or is there a better way? Picture to explain in case by description makes no sense.

Screenshot 2022-06-04 at 17.13.11.png
 
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