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polycro?
Polycro comes in different thicknesses. Apparently, it is better to get the 1.5 mm rather than the more common 0.75 mm grade.
There are some useful construction techniques, here:
https://backpackinglight.com/forums/topic/how-to-make-a-polycryo-a-frame-tarpI have read reports of Tyvek leaking at pressure points, e.g., when kneeling. On the other hand Polycro seems to be less durable.
Nick_S
Squaredisk
So a plain groundsheet cut rough to size will work and I could just buy a section of tyvek or maybe this stuff: https://www.ebay.co.uk/itm/402451476051?hash=item5db3fa2e53:g:T4oAAOSw8-VgOAfr
290cm x 132cm
5m x 150cm of this poly stuff costs £25
polycro?
https://www.99boulders.com/best-groundsheets
This guy does Tyvek sheet: https://www.ebay.co.uk/itm/282511928071