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Posted by Speedy Jim on January 2, 2007, 12:20 pm
Joe wrote:
>
>>Joe wrote:
>>
>>>Getting ready to cut a cast iron vent stack to put in a new vent, now I
>
> know
>
>>>that I must support the weight of the stack and brace it from side
>
> movement
>
>>>I will be renting one of those chain type tools for snapping the pipe. I
>
> am
>
>>>concerned since I never did this, what is going to happen since the
>
> weight
>
>>>of the stack is still there all though supported from dropping how is it
>>>going react, I really don't want this pipe to crack the wrong way. Any
>
> one
>
>>>who has done this and can let me know what to expect would be
>
> appreciated.
>
>>How big, how tall, how supported? Nowhere near enough information to
>>be able to tell anything about your particular installation.
>>
>
>
> 5" diameter pipe, about 10' above cut no branches to roof, supported by
> using existing framing and building a clamping device off of the framing
> about two and three feet above the cut (hub about three feet above cut), and
> about 15' below cut to concrete floor several branches comming off.(tub,
> toilet, sink)
> Thanks
> Joe
>
>
That will be 4" trade size pipe.
Probably looking at around 100 Lbs weight above you.
Wedge a brace at an angle under the support you have
so you can pretension it. You will need to lift that
weight in any event after you make the cut.
If the current framing doesn't support the lower
part of the stack from moving sideways, nail some
blocking down to keep it from shifting.
When the job is done, keep an eye out for roof leaks
where the penetration is.
Jim
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