We have a building that is constructed. It has a very deep footing.
The contractor originally submitted an Ames In-Building Riser, but it's too deep for the in-building riser in the building's (essentially) existing condition.
They proposed using C900 to come under the footing, without a sleeve, going below the 12" footing and then stubbing up into the riser room without thrust blocks.
We have concerns about restraint and a change of direction underneath the foundation.
NFPA 13 applies and C900 is a permitted material, which is what the contractor has suggested makes it acceptable.
Is routing C900 under a building footing, changing direction, and then stubbing into the building acceptable?
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