Technology in Architecture Lecture 15 Waste & Vent Systems Waste & Vent Sizing Procedure Bathroom Design
Waste & Vent Systems
Fundamentals Siphon action can drain water Trap blocks sewer gas Vent breaks siphon S: p. 1006, F.22.8
Air Gaps Eliminate the potential for cross contamination S: p. 1009, F.22.11
Vents and Stacks Circuit vents Soil stack Vent stack Stack vent Note: Drain fittings are 45º Individual vents Circuit vents Soil stack Vent stack Stack vent “Wet stack” Vent through roof (VTR) S: p. 1008, F.22.10
Drains & Sewers House sewer Storm drain Clean outs House traps Note: Drain fittings are 45º House drain House sewer Storm drain Clean outs House traps Fresh air inlet S: p. 1007, F.22.9
Waste & Vent Sizing Procedure
1. Identify waste & soil locations Clusters are more efficient S: p. 1014, F.22.17
2. Layout system vertically & horizontally Grouped fixtures can be stacked in a vertical riser S: p. 1027, F.22.31
3. Size Traps Trap size is used when connecting to main S: p. 1017, T.22.2
4. Calculate Drainage Fixture Units (DFU) Pipe sizes based on DFU S: p. 1017, T.22.2.2
5. Determine loads Fixture location may control size S: p. 1022,
6. Determine slope and size of horizontal drains Slope may be constrained by depth of floor cavity S: p. 1020, T.22.5
7. Verify maximum vent length Measured from plans S: p. 1022, F.22.24
8. Size vents according to DFU and length Calculate for each vent load and developed length S: p. 1019, T.22.4
9. Verify space requirements and adjust design Common adjustments “Wet” walls 6” cavity Slope and ceiling exposure Cleanout access
Bathroom Design
Design Considerations ADA compliance ANSI Standard A117.1 1986 Wheel chair access Grab bars Counter top/fixture heights Visual privacy Acoustical privacy