Class b engineering bricks failing

[lutonlagerlout]

In the last 2 years we have increasingly come across class B bricks that have failed

they all seem to be the ones with 2 rows of 5 holes

I have contacted ibstock and weineberger and all their current bricks are *F2 S2* basically suitable for all locations

has anyone else seen this?

it all seems to stem from bricks available around 8-12 years ago

here is a prime example



the blue staffs are fine and so is the mortar but the class Bs are completely blown

any ideas?

LLL

[Mikey_C]

been meaning to get a photo and post these for a while, the wall was built a couple of years ago, during the remodelling of local junction.

[Mikey_C]

[Mikey_C]

didn't build the wall myself, but did watch with interest.

[lutonlagerlout]

something very wrong with some bricks at the moment
maybe I should write and ask
LLL

[seanandruby]

Maybe it could be freeze thaw as the holes have a tedency not to fill because of the air in them, i would imagine water would seep in the holes. With soldier courses especially, the holes ( maybe ) don't completly fill. Think tiles are used to combat this over the stretcher course. Or maybe not salt resistent ???
That's my sixpenorth :;):