Residential Modern Flat Roof Drainage

There are three types of drain systems commonly used on flat roofs.

Residential modern flat roof drainage. There are four main types of residential drainage systems. Inner drains gutters or scuppers each have their own function and deciding which system is best depends on the roof size slope or no slope and cost. Surface subsurface slope downspout and gutters. Design load the water depth or build up would be limited to 3.

This will keep the load down to approximately 15 lbs. Inner drains are resistant to freezing but can require careful maintenance to prevent problems. These ditches guide water toward the eavestroughs. Although not commonly used anymore the eavestrough drainage system is a good option if you have an older large industrial or commercial flat roof.

Each of these systems has its own pros and cons. The main benefit of inner drains is that the system is hidden from view. The angle is not significant enough to prevent water from pooling on the surface. This may make it less ideal for rainy or snowy climates.

Poor drainage can lead to serious issues with flat roofing from leaks to structural damage. For surface drainage to be successful ditches must be dug in a parallel pattern. The one challenge with flat roofing is ensuring proper drainage. A flat roof may use interior drains to collect water from the centre of the roof.

One of the most overlooked items on a flat roof is the draining system. Normally for a flat roof with a 30 lb. A major maintenance issue shared between all types of roof drains is debris removal. Also known as low slope roofs flat roofs are less common in north american residential construction because the low slope of a flat roof has an increased tendency to collect water rather than shed like its more steeply pitched alternative.

A gravity drainage system on a flat roof differs from the gutter system you find on residential roofs in two key ways. More attention should be given to the location of a drainage system to avoid future problems. Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally. These drains are like the drain at the bottom of your shower except that the roof drain has a larger strainer to protect it from debris.

Drainage ditches are created in the roof in the lower insulated areas. Types of residential drainage systems. The engineer should lay out the roof drain system consistent with the structural design strength of the roof. To keep damage like leaks from occurring water should not stand on a flat roof for more than 48 hours.

Inner roof drains are used on flat roofs and include a low section or channel that collects water and feeds it into a concealed drain that leads to an underground drainage system. For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important.