The more the better I would have thought. But always a trade off against price and probably weight. I have a lightweight tent by the Swedish maker Hilleberg and its outer has a hydrostatic head of 3000mm. My guess would be not to go below that. The ground sheet is 5000mm.
Before the MH, we camped under canvas for several decades. We would not have bought a tent for use in the UK with a hydrostatic head less than 4000mm. If you can retreat from your awning in prolonged torrential rain, then 3000mm is probably adequate.
3000 is more than sufficient for an awning - you can get up to 5000 I believe now - unless you intend to sleep in your awning during massive prolonged rainstorms or store stuff in there that would be very adversely affected by a bit of damp (which you wouldn't surely as it would get damp normally form not being in an insulated area over night) then anything above 3000 is basically a waste of money IMV. In fact 2000 would more than likely be sufficient but 3000 seems to have become the 'norm' now.
Guys, thanks for that. Was a bit concerned about 3000mm due to the fact that I have a 5000mm ski jacket which wouldn't last longer than a couple of hours or so without leaking and 10,000mm trousers which are ace. Must be a difference between clothing and awnings i.e. no resistance putting the material in to compression. No idea if that is correct but sounds plausible to me. Will start looking at 3000mm HH. thanks again, Steve.
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