Hi there Big Bunny I have research a bit on tarps and the like to put under a sewn in groundsheet to protect it.
Builders merchants like Wickes have a builders membrane which is really thick 250 microns (100 guage) in aqua blue size 4m x 3m for £12.29
But the one I am going for is B&Q's membrane same thickness as above and comes on a roll, size 4m x 15m length at a bargain £23.98.
Thats enough for two tents so I can have a spare.
Also do a search on ebay for Tarp "holdon" as they are a very good gadget
Here's an example
Heres another from Tarpaulins Direct
hope this helps and good luck with your project
Regards
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