>... I was using an open track setup with no capture mechanism
> on
> *top* of the track mechanism connected to the roof - essentially one could
> lift
> the roof right off (with 4 grown men[!])- I had meant to incorporate a
> 'safety'
> at each corner but (foolishly)figured the 400+ lbs of the roof would hold it
> for
> now - even in Colorado.

My roof has a lift off preventing device:
http://www.seds.org/billa/obs/plans.html
(the flat bar welded to my support rail); I copied this from Cris Vedeler.
But last time I looked at his www site he hadn't implemented it that way.

But anyway, my rof can move along the tracks with only a couple of blocks
and the garage door opener mechanism to stop it. I'm not sure how much
force the wind would generate or what it would take to stop it.

How much wind did it take to move our roof?

--
Emerald Hills, CA USA http://nineplanets.org/

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