How to deal with pooling water on your roofThe primary function of a roof is to protect your property from rain, and ensure your home is kept secure and dry. Roofs are also designed to aid the flow of rainwater away from your house, which is why they generally consist of a pitched structure. With flat roofs, however, this pitch is minimal (about 10 degrees), and so they are more likely to collect standing water if designed inefficiently. This can result in ponding, which can cause damage to your roof if not dealt with properly.

Why does ponding occur?

Ponding refers to rainwater that has remained on the roof for more than 48 hours since it fell – quite literally, it forms ‘ponds’ that can turn stagnant and cause a variety of problems. It might mean that your roof hasn’t been pitched properly, that your guttering or downpipe is blocked, or that the roof edge has been constructed incorrectly. If you notice ponding, you should hire roofing experts to advise you as soon as possible.

What damage can ponding cause to my roof?

There are many ways that standing water can cause damage to your roof – for example, by encouraging moss and plant debris to start growing, which can then grow into any cracks and push roofing materials apart; by making the roof sag due to the weight of the water; by increasing the likelihood of leaks, which can damage the structure of the roof and affect your internal walls and ceilings; and by causing the roofing materials to deteriorate faster.

What to do if you notice ponding on your flat roof

If you realise that there’s standing water on your flat roof, it’s always a good idea to call an expert roofer to take a look. You never know, there could be an easy fix (for example, your guttering or downpipe needs unblocking), and you won’t have to pay for any major work to be done. Saying this, if you have noticed a damp patch or a leak in your ceilings, then the problem could be structural, and you will need to get it rectified immediately.

While it’s highly unlikely that your flat roof will need to be replaced, the work might involve widening your drains, adding a sloping material to help the ponding water drain from the roof, or fitting additional drainage systems to your roof. As such, it’s important that you find a roofing professional that is reliable, experienced and able to ensure the flat roof is properly repaired so that rainwater can drain efficiently away from the property at all times.

Here at South Thames Roofing, we’re experts in helping homeowners in Surrey and South London fix ponding problems on their flat roofs. Contact us today to find out more.