How do you tell if bricks are facing or engineering?

[David]

I've had a store of left over new bricks since the extension in 2012. The reds are obviously facing - I can see them in the external walls - but I have no recollection of where the yellow bricks were used.

How do you tell if they are facing or engineering bricks?

Cheers

Dave R

[Roland Perry]

In message [e-mail]>, at 13:22:32 on Fri, 29 Mar 2024, David [e-mail] remarked:

Engineering bricks have almost polished surfaces, and are about twice the density of facing bricks.