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17.4.5.4.1
In multistory buildings, riser supports shall be provided at the lowest level, at each alternate level above, above and below offsets, and at the top of the riser.
17.4.5.4.2*
Supports above the lowest level shall also restrain the pipe to prevent movement by an upward thrust where flexible fittings are used.
17.4.5.4.3
Where risers are supported from the ground, the ground support shall constitute the first level of riser support.
17.4.5.4.4
Where risers are offset or do not rise from the ground, the first ceiling level above the offset shall constitute the first level of riser support.

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