2" rigid roof flashing

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nizak

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Are the roof flashings that fit over a 2" rigid riser intended to keep water out, or as a means of support, or both?

I'm familiar with 2 different types:

-A light gauge slip over sheet metal type with a collar that comes with a rubber boot.

- A heavy gauge aluminum with an actual collar and set screw that tightens against the pipe.( Possibly an Arlington product)


In certain areas, I am encountering inspectors who are enforcing the use of the latter style saying that the support is needed.

Is there a code reference to the use of either type?

Thanks.
 
nizak said:
Are the roof flashings that fit over a 2" rigid riser intended to keep water out, or as a means of support, or both?

I'm familiar with 2 different types:

-A light gauge slip over sheet metal type with a collar that comes with a rubber boot.

- A heavy gauge aluminum with an actual collar and set screw that tightens against the pipe.( Possibly an Arlington product)


In certain areas, I am encountering inspectors who are enforcing the use of the latter style saying that the support is needed.

Is there a code reference to the use of either type?

Thanks.
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It is to keep water out. I have never seen one that is also a support. The support requirement will be based mostly on your POCO's requirement.

ETA: do you have a web link to the the one that is used as a support?

ETA #2: found the link. http://www.aifittings.com/catalog/mast-parts/aluminum-roof-flashing/725
 
I agree with Edward, the flashing is there to keep water out. The only thing I can think of for the set screw type is to keep the extended part of the mast from rattling or moving somewhat. The mast should be properly secured long before it penetrates the roof. In most POCO's in my area, once you extend beyond 2' over the roof they require a guy wire to help support the mast so that the weight of the triplex cable won't put an excessive amount of pressure on the mast.
 
344.30(A) (1) and (3).

(1) states that RMC shall be securely fastened within 3' of each..... or other conduit termination. But (A)(3) gives an exception by stating that support within 3' is not required "where approved."

If there isn't a support within 3', it sounds like your inspector can choose what to approve or reject.

There is also 230.28(A), which the inspector could interpret in various ways.
 
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