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?

2 Answers

Hi the weight and texture of the blocks will tell as the 7.3n are a heavier block.
20th Aug 2024
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Building supplier should be able to let you know about that,
Usually concrete blocks are 7.3n
And the light blocks are 3.6n
23rd Sep 2024
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