On 30 Oct, 18:34, Charlie Pridham wrote:
In article ,
If you bury the cover around the edge rather than using the grip rails
then they will withstand 120 mile winds no problem, the down side is
having to recover them every 5-7 years and the covers need cleaning about
twice a year.
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Yes I think that's still better than any of the fancy tensioning
measures - do it on a warm still day and have equal numbers of folk
either side of the tunnel pulling the sheet down and backfilling the
trench - a bit of a knack but easy when you get it. I think somebody
else said loose covers are the biggest danger - that's true, I've seen
structures wrecked by the torn sheet flapping in the wind.