Buildings in the US

[MortarThePoint]

I found the video below and interesting watch from a UK perspective. I'm not knocking it in any way, but it highlights the difference between UK building regulations and the US. It's worth noting that they build much larger homes in the US and are much more likely to have AC. There are also many more homes in the US. In the UK, we go a long way to make our houses perform more effectively in deference to the climate impact, but we all share one atmosphere and a single US home may have an impact 3-4 times as large as a UK one and there are probably 6 times as many. It's easy to start to doubt our approach in the UK, but worth keeping an eye on the personal financial impact as well as the environmental benefit.

 

As an example, at 13:28 they show the floor insulation which is US R10 and looks to be about 50mm of XPS. R10 in UK units is a U-value of 0.57 W/m²K. Air interfaces etc may lower that to something like 0.5 W/m²K, but the limiting value for building regulations in the UK is 0.18 W/m²K and the notional value is 0.13 W/m²K. Just considering that and the larger footprint area in the US makes a huge difference. Various Google searches suggest that the average footprint in the US is over twice that in the UK. If you assume the same weather, that means they pass about 6 times a much heat through the floor as a UK house. The roof and walls also wouldn't come close to meeting UK building regulations values and are of much greater area.

 

Are we over doing it in the UK?