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Mr Wilkes

Concrete Blocks......

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Ive just been given a lot of concrete blocks..the guy said they are the sort that goes inbetween concrete joists to make a floor . what i want to know is..are they for internal use only or could i use em outside in the british weather ?.

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Cheers bob...they are just a bit lighter than the pack of 7n concrete blocks i have, i suppose if i paint them they should be ok.

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You use normal 4" concrete blocks inbetween "T" beams (concrete joists).

 

You might have 6" blocks already so thats why the ones youve been given look lighter, and if they are 4" block they can be used for building with

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they might be aerated blocks, but they don't like like normal blocks, look smoother.

 

or could be pumice, although they probably wouldn't be right for t beams

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They could be filled with polystyrene inside for insulation of the floor, have you broken one to see?

 

TC

Edited by tiercel
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Lightweight block ? Still suitable for building with , just break one and see if it's concrete throughout or hollow

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fenlights mate.all the same for walls .some block n beam blocks are the lighter celcon type but also some jobs specify the 7n blocks.all the same walls.floor etc.fine for walls.

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They are what we call breeze blocks there not as strong as the heavy dense blocks what you are calling 7n they will be ok to build with but you will have to render them because if it rains then freezes they will start to crumble, p.s. thats if youre gonna build them outside, atb wf

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The pictures you have put up are of solid 100mm concrete blocks and they will be a strong as any you can buy the one which go in the floors are called pot and beam and are normally used in apartment blocks the ones you show in the picture are normally used in wall construction above the dpc and are usually rendered if used outside hope this helps

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