How to fix ponding water on a flat roof

Find out the secret to fixing ponding water on your flat roof. It doesn’t have to cost the earth and you really can do it yourself!

After any rainfall lands on a flat roof, water will begin to pool. On a performing flat roof ponding water is not a problem as it will drain, or even evaporate, away. However when your flat roof has uneven areas due to sagging, an insufficient slope, or drainage issues, the ponding water doesn’t dissipate.

Common problems caused by flat roof ponding:

• Degrading roofing materials, particularly on older modified and built up roofs
• Extra stress and damage to the load bearing structure due to the extra weight of the water
• In winter freezing standing water will expand causing more damage
• Where seams overlap the ponding water can cause the membrane to lose it’s seal, allowing water in underneath
• Stagnant water allows moss, algae and debris to collect and provides a breeding ground for insects

The solution to ponding water on flat roofs:

Until recently, repair options weren’t something that anyone other than experienced roofers could consider. Roof filling compounds were heavy, brittle and time consuming to apply.

Now there is a trade product on the market that means you can fix the problem yourself, quickly and easily.

Greenslope is new to the UK market and incredibly effective and easy to use. This is the only flat roof ponding filler of its kind currently available in the UK.

If the roof sags or has small uneven areas these need to be levelled. This very easy to apply DIY flat roof levelling compound kit comes with everything you need to pack in the dip and seal with a waterproof coating. You can even create slopes with it to navigate water towards drainage exits! Super easy and fast to apply, it can save you hundreds on your roof repair. Get your ponding water repair kit here.

There could be a simple solution to your roof ponding issues and it is definitely worth investigating these before you call in the professionals!

Other things to check:

Check your drains: If there is anything obstructing the flow of water to the drain or the drain is blocked, remove any debris or blockage.

Structural issues: If you have improperly installed frames, joists or beams you’ll need to call a professional to come and recommend.

Want some more recommendations on flat roof repair and DIY solutions to ponding water? Give us a call or drop us a line and our team of experts are always happy to help!