Quote:
Originally Posted by Captain Planet
It's going to heavily depend on the load and the structure of the building.
Those rafters or beams are typically in tension between the walls, and not typically laterally loaded.
You may need some sort or reinforcement, like sistering, kneewall, collar-ties, etc.
The Racor style distributes the load over a larger area than say just mounting a winch and few pulleys.
You would need to hire a PE for this or at least someone who can do load calcs.
That's assuming you're going to get a permit of some sort.
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Not connecting to building. Bought a 1000lbs rated gantry crane solely/specifically for this.