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