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Posted by on September 21, 2007, 6:12 am
wrote:
>On Sep 20, 2:44 pm, alvinamo...@notmail.com wrote:
>> wrote:
>>
>>
>>
>>
>>
>> >On Thu, 20 Sep 2007 08:34:26 -0700, Mikepier wrote:
>>
>> >> I have to cut off a section of cast iron waste pipe in my attic to tie
>> >> in a vent .My concern is when I cut off the section of pipe, the
>> >> weight of the upper part of pipe would cause it to possible come
>> >> loose from the roof flashing and sink, thus causing a roof leak. The
>> >> last thing I want to do is open up a can of worms by doing this job. I
>> >> was wondering if I should be concerned or if anyone else has done a
>> >> job like this, what advice to offer. Thanks
>>
>> >You didn't state exactly where you are working on the vent pipe. Chances
>> >are you will see very little, if any, movement if you work below existing
>> >vents tied into the main pipe. It would still be a wise choice to secure
>> >the uppermost part of the pipe with strap supports designed to hold pipes
>> >securely.
>>
>> >A reciprocating saw would seem to move the pipe less than doing so with a
>> >handsaw.
>>
>> >I did exactly what you are doing several years back. That vent was cast
>> >iron. I had to cut the pipe in the basement to reroute tub and stool.
>> >There were enough pipes above me to support the vent without moving.
>>
>> >Reflashing or caulking the existing flash when done makes sense.
>>
>> If all you are doing is adding a vent, you can buy strap around
>> devices. Then cut a square hole in the cast pipe with an angle
>> grinder and attach the "strap on". You dont need to cut the whole
>> pipe. After all, it's only a vent.- Hide quoted text -
>>
>> - Show quoted text -
>
>Is there a place online I can find out more about this?
Possibly..... There are some plumbing supply stores online. However,
I'd check your local plumbing supply places. These things are
commonly used. I dont know the exact name for them, but I have seen
them. It's basically just a device that fits around the cast iron
pipe. It fits around about half the pipe, has a rubber gasket, and
uses large hose clamps to attach it. There will be a 1.5 or 2 inch
threaded hole in the side to attach your pipe. They also make similar
devices for water pipes, so it's easier to attach a water source to an
ice maker. Those are called "saddle valves", but they have an actual
valve built in. Knowing that, these drain pipe devices could be
called "saddle" (something). Just a guess.
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