I am amazed by the figures quoted here.
7500mm minimum water head ?
Really ? how come for years and well before TT and others came about, we have had tents that were and are still rated at 800mm or thereabout ?
I remember Ben pointing out that a very popular line from Eureka (Timberline series) has the fly AND floor rated at 800mm; beside what is the rating of the floor in all those shelters that don't have one....?
( that is how come people in their mids often with just a mat on top of a groundsheet, do just fine ?)
This reminds me of a comment at WB along the line that "the higher the bathtub floor , the more llikely you will get flooded " the point there was about location, made from a guy that uses an open tarp
Winds of 190 mph (later amended to 170) .. really ?
(BTW we had winds like that here, from a cyclone, however nobody was camping, just trying to stay alive above water in a few emergency buildings)
Do you expect any tent to stand up to that ?
And , in my experience, unlike some other fabrics that wet out and somehow lose some of the water head , silnylon remains the same. So yes you can get some mist within minutes but it will hold prolonged rain for days. I have done several test leaving my shelters up for days on end .
BTW, at least before they wet out, as far as I understand 800/1000/1200mm waterhead is the same regardless of the fabric/laminate in use.
A point that has been glossed over is that , as Richard pointed out, the misting in many shelters is somewhat masked by the inner , particularly the ones made of fabric or with a fabric top, however you may end up packing up a wet ,from the inside, shelter that in some cases will develop mildew and or delamination in the long term and at least result in a heavy shelter right away.
(again, weigh your shelter dry, leave it out in the rain for a few hours , then pack it up . weigh again. You will be surprised at the weight gain...)
Anyway, when you guys find a fabric/laminate that it is lighter/stronger/has abrasion resistance , a higher water head than silnylon,has better UV resistance, does not delaminate, can be seam taped, comes in your favourite hue, cannot form mildew /become sticky and is less than $20 per yard, ...please let me know.