Tuesday, February 24, 2026

Rainfall and Flat Rooftops - A Global Disaster

 I can see the problem in the picture of a local council building in Harrow, NW London. The local councils in London allow sub standard flat roof homes - when the annual rainfall is getting worse.

Flat Rooftops And Rainfall

The flat rooves leak and make mouldy housing. The sick people are draining the NHS. 

Landlords and householders are bankrupt fixing leaking rooftops. So rents rise.

Official websites say that a properly designed flat roof should not leak - if it has a slope.  A slight slope. But nonetheless a slope. 

The advertisements for remedies will tell you the problems.

I have experienced leaking flat roofs in Singapore and the UK. It's not just a recent problem. It has been known for years. You can see that houses in medieval and Victorian times - the ones which lasted, have gabled rooftops.

A slight slope is not good enough. We have a conservatory with a supposedly see-through ceiling with a slight slope. Leaves and moss gather on it. They don't roll off.






Useful Websites

Rain in the UK

https://www.metoffice.gov.uk/blog/2026/why-has-it-been-so-wet-this-winter

Flat Roof Defects

https://www.designingbuildings.co.uk/wiki/Flat_roof_defects

Flat Rood drainage

https://www.buildingregs4plans.co.uk/guidance_flat_roof_drainage.php

More rain in Australia

https://www.dailymail.co.uk/news/article-15586039/sydney-melbourne-weather.html

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