When I built my garage I drilled a one inch hole at the top of four of the
rafters. I placed two one inch steel bar through two of the holes parallel to
the roof. From the ends of these bars I hung a chain with all four of the
chains meeting and joined together at the joists.
I've use this to pull engines, lift cars and unload stuff from my pickup. This
splits the load among four rafter (2x6's).
Bob Nogueira
On Mar 17, 2012, at 10:45 AM, Jim Franklin <jamesf at groupwbench.org> wrote:
> On Mar 17, 2012, at 11:07 AM, Tim wrote:
>
>> A qustion for engineers here maybe?
>>
>> I want to hang a Datsun Roadster car body from the joists above my shop
>> and garage space so I can start working on a frame in the shop.
>>
>> The joists are approx 2' apart and made of 2x4s. The roof is a 4 12
>> pitch. The car body might weigh as much as 700 pounds but I have yet to
>> get an accurate answer. (I thought I had read at one point that the body
>> weighed between 400 and 500 pounds.)
>
>
> It's important to get some terminology straight before answering this.
Rafters
> form the pitch of the roof; joists are parallel to the floor and stop the
> walls from spreading out (and occasionally are strong enough to support
> storage up there):
>
> http://www.carpentry-pro-framer.com/images/anatomy-of-a-common-rafter.png
>
> The span of the joists is important. How long are they? 2x4s will hold a
lot
> of weight but not if they're 20' long.
>
> Trusses are pre-manufactured as a triangle and might support a car body,
might
> not. It depends how they are held together.
>
> What do you have up there?
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