How to tell if concrete blocks are 3.6N or 7.3N
Hello everyone. I am building a two-storey extension on my house and have been able to get my hands on some concrete block for pennies. However, I don’t know if they are 3.6N or 7.3N. How can I find out?
Advice from 3 local tradespeople
To determine if concrete blocks are 3.6N or 7.3N, you must check their packaging or manufacturer's documentation for the stated compressive strength. Visual and physical differences like weight can be indicative (7.3N blocks are heavier), and some manufacturers, like H+H, use color-coded stripes (e.g., a black stripe for 7.3N blocks).
Building supplier should be able to let you know about that,
Usually concrete blocks are 7.3n
And the light blocks are 3.6n
Hi the weight and texture of the blocks will tell as the 7.3n are a heavier block.
