>From my experience in the commercial construction trades which was hanging steel plumbing pipes from this stuff, you can hang from the top cord only. Use a clamp that is threaded for allthread rod. Don't drill the cords. Drop the allthread below the bottom cord and attach the cross/roller beam. No problem The hambro system is rated to hold the weight of the materials plus some people standing on it, AT LEAST!. A roof structure will hold less weight than a floor structure. The roof is not designed to carry any extra unless there is a rainwater load possibility. The more joists you spread the load across will ensure safety. Try this: First hook a clamp to the top cord of one joist and hang your lift. Put some straps around a 1902 upright and start to lift. Measure the deflection with a story pole and tape measure. If you feel safe lifting it all the way, when you distribute the load, you have a safety factor. Trial and error. Wear your hard hat or the insurance won't cover you after you've been squashed. Keith Roberts On 4/26/07, Phil Bondi <phil at philbondi.com> wrote: > > Hi all. > > Before I spend any money on this, I want to get your > thoughts on this subject.. > > -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20070426/52c0e029/attachment.html
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