Comment by michaelt
15 hours ago
Well, we are commenting on an article specifically about the spread of fire in urban areas, as we've seen in LA this week.
Here in the seismically stable UK, we had problems with fire spreading in urban areas [1] in 1666. So we banned wood exteriors on buildings. It works pretty well if you don't need to worry about earthquakes or hurricanes; brick doesn't burn.
This lesson is taught in history classes to 10 year olds, and they don't tend to go into other countries' construction traditions, or reasons not to use bricks.
> Here in the seismically stable UK
I don't think the US has enough seismic activity to be much different. Chile and Japan do fine with solid construction and periodic 6-8 Richter earthquakes. California is allegedly a seismic state within the USA and it rarely sees a 4 degree one, and when it happens it makes it to the US national news (and sometimes even to the news back home, but as a comedy break because people don't even think about getting out of bed if it's not a 6).
I'm not sure about hurricanes, but maintenance can't be much different as rotten wood and moldy bricks are both a problem. Maybe insulating bricks is more expensive?
> This lesson is taught in history classes to 10 year olds, and they don't tend to go into other countries' construction traditions, or reasons not to use bricks.
Cultural differences don't help here, in the US people think about rebuilding homes way more often than people in Europe, so there's this mindset that the home doesn't need to last that long because it will be rebuilt anyways. This shorter life span, "freedom" and profits thanks to lower costs also call for little regulation that forces the building code to aim to survive the regional disasters from the past 60+ years. California's fire code is probably an outlier, but SF had to burn down for the regulation to come out.
I think you underestimate the frequency, strength, and geographic distribution of strong earthquakes in the US. There is nothing comparable in Europe. You have to engineer for the strongest earthquake, not the average one, and on the US west coast that is M8-9+ depending on the specific location. The construction techniques in Japan and US are very similar because both have similarly extreme earthquakes.
The entire western third of the US is has several M7+ earthquakes per century, with a M6 every couple years, and the occasional M8-9+. The 1964 Anchorage earthquake was stronger (M9.2) than the 2011 Japanese earthquake that caused the great tsunami.
In the eastern US, there is a giant seismic zone that had multiple M8+ earthquakes in the 19th century. These were so powerful they changed the path of the mighty Mississippi River. People forget about it because it hasn’t had a large earthquake in over a century.
A lot of R&D is done on new construction techniques for extreme earthquake risks. The challenge with reinforced concrete is the absurd amount of reinforcement and steel you need to make it survive an earthquake that strong, which makes construction slow and expensive. The state-of-the-art doesn’t use reinforced concrete at all, even in skyscrapers; they use specially designed welded steel plates and fill the empty spaces with poured concrete.
The US has an anomalously high exposure to natural disasters as an accident of geography. For example, people often forget just how many active volcanoes there are in the US, including multiple super-volcanoes. While I live in an area well-known for its M9+ earthquake and tsunami risk, I can see three active volcanoes from my kitchen window.
Less about the question (that has been asked so much now its tiring) but more on how when people do ask it, they always ask in such a negative way. Its not why are so many homes built out of timber/wood but rather why are they built out of sticks?
“Stick-built” is the name for it.
There are two main ways to build a house out of wood. You can go for stick-built construction or timber framing. Homes in the US were mostly timber framed until the early 1900s. Advancements in tools and manufacturing techniques has resulted in stick-built homes becoming dominant in the US since then.
If you search for “stick-built” you’ll see pictures and encyclopedia articles describing it. The basic idea is that you take standard dimensional lumber (like 2x4s), bring it onto the site, and assemble it into the frame for the house. Timber construction uses larger pieces of timber to make the house.
I’m not an expert but it seems to me that stick-built construction took over the country because of advancements in fasteners. If you tried to make a stick-built house in the 1800s it would fall apart, but this is the 2000s, and they make a million of them every year.
> I’m not an expert but it seems to me that stick-built construction took over the country because of advancements in fasteners.
The availability of engineered wood products like plywood is a big part of it too. Being able to attach what's effectively a solid sheet of wood to a wall adds a ton of shearing strength, for example. (And that's without getting into fancy modern engineered wood products like parallel-strand lumber or glulam, which give you something even better than raw wood.)
It draws a compelling portrait in people's minds. Everybody knows how easily sticks burn.
are there people besides the posters that find this kind of hyperbole compelling?
2x4s burn much quicker than sticks. Try it.