It could be a red rubber (a brick made for 'rubbing' to shape on a rubbing table, now only made for special refurbs)
Or almost anything, there are at least 2500 different brick types in common (pun) use.
Hi, OK,
they are victorian wire cuts. (The groove you see is made by something becoming attached to the wire as it was drawn through the slab of clay)
They would not be regarded as engineering bricks, rather classed as a 'fletton' or common house brick.
They are quite resistant to water penetration and are about the same as a modern brick in that respect, ( putting the lie to Jo90's claim that 'modern' bricks are better, then what would he know? (nowt, is the correct answer))
You will find that they are quite a bit bigger than a modern brick too, being made to lay at 4 course to the foot, (or possibly even 4 to 13")
Mod=ern bricks being metric and measuring a nominal 65mm x 215mm x 103mm) although the length in particular can vary from 210mmm to 225mm throwing more water on Joe's prognostications on plumb perps
I have to build up an old sill to bring it level with a neighbouring window, prior to new windows being fitted. Are these as strong, stronger or weaker than traditional frogged bricks. I have enoughold ones of these to do the job, but not quite enough traditional ones.
Yes go for it.
If the bricks you are building on top of are modern post metric they may not (will not) match in courses and/or perps, but if it's just a few course they may work out, try them against the existing and see what's what.
It depends on how good it needs to look facework wise.
The ones you show apear to have been trimmed for length anyway.
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