Time in loo

How many times do school children go to the loo each day? A lot less than everyone thinks they do, it turns out. It may sound like a trivial preoccupation, but it’s crucial when it comes to working out how much water schools can save by installing efficiency measures in toilets, and whether it’s worth their while to do it. The standard assumption is three trips a day, but one survey found that it’s closer to once, if at all – which means that the possible savings are massively overestimated, by a factor of up to six. This is just one of eight “sustainability myths” I discovered in this feature for Construction Manager – accepted practices in green building that don’t necessarily do what they promise. Also revealed: why low-carbon houses can cost more to heat than gas-guzzling ones, why domestic rainwater harvesting systems aren’t worth the hassle, and what to look out for if you’re buying a super-insulated modern flat…