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Setting timbers

3897 Views 23 Replies 6 Participants Last post by  muskoka guy
Does anyone have experience setting timber frame houses? We will be building some houses with partial timber frames and i am trying to imagine the best ways to set them. Specifically setting the rafters safely. I'm just not sure how t rig the straps without them sliding down. ( I'm sure i can figure it out, i just thought I'd ask)
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What do you mean "sliding down"? Do you mean sliding up the truss when you come up on the crane? A girth choke, sometimes with an extra wrap should stay in place, even lifting a column.
Good call. Also just realized that if I'm setting rafters, i can just screw a block to the top since it will be covered anyway. Duhh

Going to use a rope rigging? Call OSHA first.

Do like I (the professional rigger ) say, and choke it.
Really!? "This sounds dangerous if you have to ask these questions" seriously? ............ Look at my history, i'm plenty qualified.

Says the guy with the OSB work platform?
Not a problem, I'm certified as well. Maybe you do have the experience but I wasn't sure when I got the impression you were thinking of lifting them with a rope. Don't use a rope! use straps.

If it was me building this I probably wouldn't set them with a boom truck or forklift. I would set up some planks and muscle them up. Because you're talking rafters not trusses right? Seems like a lot of fooling around rigging up one at a time and trying to control it with a boom truck. If you really want to set them with equipment then I would use a spreader bar. And call the manufacturer of the bar to ask them if there's a safe way to hoist your rafters at an angle. But my guess is they'll tell you not to do it. If you've ever lost a beam being lifted or seen it happen, it doesn't take much tilt before the thing goes flying out.

I've been a qualified rigger before there were qualified riggers.

The company that makes spreaders shouldn't give you an answer, because there is no way for them to know. In fact, I don't see why you would need a spreader for a rafter or a truss.

You could girth the rafter in two places with a hitch similar to a prusik, and then render the slings with a come-along until it was at any angle needed, with no danger of the slings slipping out.
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No, the Kingdome accident had nothing to do with that, and nothing to do with scaffolding at all.

Long Painting had either Essex or Ness attach a man basket to the end of the crane. They boomed up, and ran the loaded basket into the roof and busted the lattice boom jib.

You are required to contact the manufacturer when you modify "a major element" of a crane. Attaching a man basket to the boom tip where there is none available is a major modification. Adding a CD player, a LMI or ATB where none came with the crane originally is not a major modification where the devices are for warning only, and are not tied into the controls.
I see what you mean with your idea but in my opinion spreaders are safer, less movement.
I don't, and I'm presently the rigging superintendent for a crane company
I disagree with you, but you can think that. Btw, the guy that actually wrote them the fine is the one that explained the Kingdome incident to me.
Well, he must not be too smart
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