Water Drainage On Flat Roof

These ditches guide water toward the eavestroughs.

Water drainage on flat roof.

Roof water drain types and sizing sizing a roof water drain. Knowing a bit about your roof can also help you avoid flat roof repair from ponding and drainage issues. The first step in sizing a roof drain is to calculate the surface area of the roof that the. If these roofing types are not fitted with a proper drainage solution they will experience poor drainage which leads to the following issues.

If you realize your so called flat roof is actually a low slope roof you will better understand how a flat roof drains water. Drainage ditches are created in the roof in the lower insulated areas. In most cases a flat roof will pitch in a single direction where gutters can then catch the runoff to remove it. How water runs off a roof depends on the amount of rainfall and how quickly it needs to drain.

Why flat roof drainage is important. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. A low slope roof tilts slightly downhill from its center or from one side so water rolls off to parapet scuppers and down the hopper downspout. Damage to the caulking and tar from debris buildup and pooled water.

Although not commonly used anymore the eavestrough drainage system is a good option if you have an older large industrial or commercial flat roof. This kind of drainage system is most common on small flat roofs where water volume and buildup isn t extreme. Accumulation of debris such as twigs and leaves. The drainage system of any roof can be located at the edge or in the middle of the roof.

What do drainage systems do. It s also sometimes used in tandem with scuppers. Conventional gutter systems such as those used on most houses are suitable for some low slope roofs.