21/08/2026
Why Concrete Cover to Rebar Is More Critical Than You Think
Getting the concrete cover to reinforcement steel wrong is one of the most common (and costly) mistakes on construction projects. Too little cover and moisture reaches the steel, causing it to rust and expand, which cracks the concrete from the inside out. Too much cover and you risk reducing the structural effectiveness of the reinforcement altogether. What's the right balance for your project?
The cover required depends heavily on the environment and the concrete grade being used. A C40 mix used for HGV yard foundations or septic tank bases has very different exposure requirements compared to a C25 used for general footings and trench fill. Getting the specification right from the pour itself is where Roman Concrete can make a real difference, whether that's a volumetric mix calibrated precisely on-site or a pre-mixed drum delivery for larger commercial work across North Kent. Have you ever had a project where incorrect rebar cover caused problems down the line? Drop a comment below. ๐
https://www.romanconcrete.co.uk