A commercial roof does a whole lot more than just cover the building. It functions as a protective system that also shields the structure, equipment, and occupants from the effects of the weather and environment. What is very much a factor in the life span and performance of a commercial roof is proper drainage. When water is able to get off the surface easily, the roof system will perform as it is supposed to. But when drainage is an issue, a large scale of structural and maintenance issues can present very quickly.
What Role Does Drainage Play In Commercial Roofing?
Unlike in the case of residential, which tends to have pitched roofs, they have large-scale commercial structures that mostly go for flat or low-slope roofs. In this case the design is to allow water flow off the structure, but that is mainly through the use of drainage elements like internal drains, scuppers, and gutters. If these are not present or are inadequate, the rain that lands on the roof will stay there for long periods; that is what is called ponding of water.
Ponding water places stress on roof materials and the structure that supports them. Over time that extra weight may weaken the membrane of the roofing system, break down insulation layers, and increase the chance of leaks. Even the best quality roofing systems may see premature wear if water stands on the surface.
The Risks Of Poor Drainage
When proper function of drainage systems is not present in a commercial setting, issues do arise, which in turn affect the performance of that roof.
Structural Stress
Standing water is a great stressor for roofs. In some extreme cases this extra weight may cause structural strain, which in turn may affect older buildings or those with preexisting weaknesses.
Membrane Deterioration
Roof membranes are made to repel water, but continuous contact with standing water will speed up their breakdown. Over time seams may weaken, and protective layers will begin to fail.
Increased Leak Potential
Water that pools in certain areas is more prone to leaks. At seams, flashing, and points of penetration, moisture has more time to remain in contact with these elements.
Debris Accumulation
Poor quality drainage, which in turn sees leaves, dirt, and other debris accumulate at drain points and low areas of the roof. This issue in turn causes a chain reaction, which in turn sees the drainage problems get worse.
Components of Effective Commercial Roof Drainage
A properly designed commercial roof has a number of drainage features that work as a team to direct water off of the surface.
Internal Drains
In large commercial buildings internal drains are a common feature. They run water through pipes that are contained within the structure, thus preventing exterior runoff from the building.
Scuppers
Scuppers, which are also referred to as “weeps” or “transoms,” allow water out of the roof via holes in the walls and/or parapets. Also, they are sometimes used with downspouts to run water away from the structure.
Gutters And Downspouts
Gutters and downspouts are used in commercial roof systems with low pitch to collect and direct water to specific drain points.
Roof Slope
Also, it is true that roofs that are proper have a proper slope. Even flat commercial roofs usually have a small slope, which in turn causes water to go to drains instead of pooling in low areas.
Maintenance And Inspection Considerations
Routine inspection is key to the maintenance of proper drainage on commercial roofs. With time, debris, weather exposure, and building movement take their toll on drainage elements. By having a maintenance schedule, they ensure that drains stay clear and water flows freely.
Property managers and also building owners profit from the practice of regular checkups of drainage systems post-heavy storms or at the change of seasons. They see that which leaves the systems clogged, monitor which areas tend to have issues of standing water, and also make sure that the flow of water is not impeded, which are all actions that in turn protect the overall performance of the roofing systems.
Supporting Long-Term Roof Performance
Drainage is a key issue in commercial roof health. What they see is that whichever way they direct the water from the roof, the better the performance of the materials and the longer the system will function as it is designed to.
Being aware of how drainage systems work and what they do is a step that building owners and property managers can take to better inform their decisions related to roof design, maintenance, and long-term building protection. What they put in place for drainage also protects the roof but also is a key factor in the preservation of the structure as a whole.
