AtriBuild
Sign inStart designing
Pending review

Building systems guide

Drain and vent planning context

Reserve plausible vertical and horizontal coordination zones without generating plumbing design.

Created 2026-08-02Author: not yet recordedQualified reviewer: not yet suppliedSubstantive review date: pending

Direct answer

Cluster fixtures and reserve continuous paths to stacks and service exits early. Because drainage depends on slope, venting, fixture units, cleanouts, structural penetrations, and local rules, AtriBuild should show only assumptions and conflicts until a plumbing professional supplies the design.

Planning workflow

  1. Mark each fixture, likely stack zone, service exit, and floor penetration.
  2. Overlay structure so routes do not silently pass through beams, footings, or inaccessible spaces.
  3. Track vertical changes and conceptual slope direction without claiming a compliant slope.
  4. Give the coordinated plan to the plumbing designer and authority having jurisdiction.

Formula or decision logic

A conceptual gravity route must trend from fixture toward discharge and preserve vertical room for a professional-designed slope. If available fall = start elevation - end elevation is nonpositive, the concept is immediately blocked. A positive fall still does not establish acceptable pipe size, slope, venting, or routing.

Worked planning example

A 24-foot conceptual branch has 3 inches of available fall between the fixture zone and the stack. The overlay can report 0.125 inch per foot as a geometric observation. It must not label that value compliant because diameter, fixture load, fittings, local amendments, and vent design remain unknown.

Open this starting state in AtriBuildUse the related calculatorReview Detached ADU concept

Limitations and review boundary

  • This is not a drain, waste, and vent design tool.
  • Structural and fire-resistance penetrations require coordination.
  • Local plumbing codes and professional judgment control.
Conceptual planning onlyAtriBuild does not provide architectural or engineering services, stamped plans, permit approval, code-compliance verification, contractor bids, or construction guarantees. Verify dimensions, assemblies, utilities, quantities, prices, permits, and safety decisions with qualified local professionals.

Primary sources

Continue in building systems

Electrical layout concepts for early planning

Coordinate intended loads, outlets, lighting, controls, equipment, and routes without pretending to design a compliant electrical system.

Read guide

Read a conceptual power-connectivity overlay

Use graph reachability to expose disconnected endpoints and disabled branches while preserving the engineering boundary.

Read guide

Conceptual water-supply routing

Compare trunk-and-branch, core, and manifold concepts by route length and fixture grouping.

Read guide

Browse the building systems hub

Conceptual power, water, drainage, and HVAC planning with visible professional-review boundaries.

View all guides