Ponding Water on Roof

If a leak occurs due to ponding water on the roof, don’t blame the water – blame the roof. A quality roof completely seals out water. When properly maintained, it will stay sealed and won’t leak. 


Roofs are Designed to Prevent Ponding

When a roof is built, it’s designed to prevent water from ponding, even flat roofs have a slight slope to them. The guidelines state a minimum of ¼” per foot. The roof should be sloped in a way that guides water towards the drains. As long as the drains are clear, the water won’t pond. Otherwise, a drain that has been clogged for too long will cause a lot of ponding water on the roof. 


What Causes Water to Pond on a Roof?

The most common reasons for water ponding are:

  • Improper drainage
  • Warping or blistering that changes the slope of the roof
  • Debris build-up on the roof
  • Moss and lichen growth can hold enough water to weight down an area
  • Any heavy items or roof traffic can compress the insulation under the roof membrane over time creating an indent for ponding.
  • Natural settling of a building over time can change the slope of a flat roof so that water is not draining properly.
  • Roof penetrations such as vents and skylights might indent the roof at certain parts which over time can change the slope.

Why is Water Ponding on a Roof Bad?

When a roof is functioning well and sealing out the ponding water and letting it drain there is no need to worry.  But if it is ponding and not draining it is stressing the roof.  To keep a roof system functioning at an optimal level it is important to alleviate as many stresses as possible.

How to Prevent Water from Ponding on the Roof

The only way to prevent ponding water is to have the roof maintained regularly.  This means scheduling an assessment and having minor repairs and preventative maintenance done.


Request a Quote

Ponding Water on Roof Repairs Toronto

Featured Services

24/7 Emergency Repair

Panic can set in when roof leaks are causing immediate damage. When a bucket isn’t enough, every minute counts.   Detail Roofing Technicians are on call 24 hours a day, seven days a week for emergency roof leaks. Trucks are stocked with the all the necessary supplies to make repairs in any condition. Our fleet size allows us to get to customers faster.

Roof leaks happen at all times of day or night.  If there’s water coming into a unit  it is an emergency.  Luckily Detail Roofing has roofing technicians available 24/7.

Read More

Prevent mold, tenant calls and costly repairs…

Read More

Very durable and resistant to moss, mildew and other forms of decay…

Read More

Detail Roofing offers roof replacement financing for Condo Corporations and commercial buildings

Read More

Parkades get leaks too and Design Roofing repairs them…

Read More

Birds and pests are a nuisance on roofs.  It’s best to be proactive and have deterrents in place before nesting season.

Read More

Ready to Start your project?

Detail Roofing is one of the premier Greater Toronto Area commercial & Condominium Corporation roofing contractors. Our professional approach to commercial and industrial roof installation, roof maintenance and repairs has earned us a reputation of excellence among architects, general contractors, roof consultants and building owners alike.

Schedule an Assessment