PEX Home-Run Manifold Port and Tubing Takeoff
PEX home-run manifold ports and tubing for one line per fixture: cold ports = fixtures; hot ports = hot fixtures; tubing = (cold + hot) x average run x (1 + waste). 8 fixtures with 6 hot needs a 14-port manifold and about 539 LF of PEX at a 35 ft average run; a 12-fixture house (10 hot) needs 22 ports and 847 LF. The manifold is sized to the total ports plus spares; the fixture count drives both. A port count and footage distinct from the flow-sizing pipe-sizing.
Formula and source
cold_ports = fixtures; hot_ports = hot_fixtures; total_ports = cold_ports + hot_ports; tubing_lf = ceil(total_ports x avg_run_ft x (100 + waste_pct) / 100).
PEX home-run takeoff identity by name (one port per fixture line; tubing over the average run with waste); first-principles count arithmetic.
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