| | Illustrated PDF Version | | :--- | :--- | | “A vent pipe shall rise vertically to a point above the roof.” | A 3D cutaway showing a lavatory drain connecting to a soil stack, with the vent piercing the roof flashing. | | “The fall shall be 1/4 inch per foot.” | A color-coded slope triangle over a horizontal drainage pipe. | | “Water hammer arrestors shall be installed.” | A cross-section of a mechanical arrestor versus an air chamber. |
A typical bathroom cluster (water closet, lavatory, shower, bathtub, floor drain). Key takeaway: All fixtures connect to a common horizontal branch that connects to a vertical soil stack. The illustration highlights the trap seal (usually 2 inches of water) blocking sewer gases. national plumbing code of the philippines illustrated pdf