It made the channel the water to the drains and away from the building. Effective drainage makes the single greatest contribution to the durability of the roofing system. Ideally the slope of the structural deck should provide the slopes to drain. We should divide the roof surface into smaller square or rectangular areas to use more rather using large drains. It is good practice to use two drains in each drainage area in case one drain gets blocked. Some building codes require two separate drainage system for each roof section to protect from plugged storm and the potential over loading of the structure by pounded water.

How to connect the pipes:

The roof drainage piping is connected to the roof drains. This piping is usually extended in the ceiling.

Roof drainage system:
Components used to carry water off the roof and away from a building such as gutters,
Downspouts and splash back. Recent extreme weather conditions have caused significant damage to buildings, roads, railways. Most evident have been rainfall and flooding events. The changing climate also posses other risks such as:
1. Delay to construction programmes;
2. Slope instability
3. Damage to fabric of building, particular its effect on cladding.
4. Structural damage for wind related events.
5. Effect on roof drainage.

This makes is hard for construction professions to know when additional considerations should be applied in decision making. Roof slabs offer greater control and flexibility than the one-piece roof. Use flat slab with 0 slope for flat roofs. Articulate the plan view with lines for drainage. Repairing leaks on drainage waste and vent system can be time consuming and troublesome. When it rains hard this entire portion of the roof looks like a lake. Drainage of this area occurs by evaporation only. Drainage facilities are necessary when these systems are emptied for maintenance as it passé from the roof. The top of the exterior walls under the eaves that aids water drainage roof eaves or at the rake of the roof. Ponding of water and inadequate existing drainage contributed to increasing the leakage of the interior.

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