Box Section

In construction, a box section is an extruded length of metal with a hollow square or rectangular cross-section. The shape provides rigidity.

Most modern cars are not built on a chassis of welded box sections, instead the strength of the car comes from the shell, into which are sections are welded to stiffen the shell.

These are often spot welded in place, which allows enough gaps for liquids to flow inside of them, but they are enclosed enough that there is no access.

As they often run the length of the car, they can provide a channel for water to flow along. Meaning that water dripping in the boot of the car can end up in the front. 

It is often the case that when people say they can hear water sloshing around, it is water inside box sections.

Although removing the water is relatively simple, because these sections are enclosed with no access, it is not possible to physically clean inside them to treat contaminated water or spillages. This means they need to be flushed through and/or treated with steam or fog.

Written by Danny Argent. Last updated 03/11/2023 17:31

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