Weber 222 or 224?

[MrMinkhe]

Grateful if anyone can explain the actual differences between plaster/mortar 222 (B) and 224 (C) from Weber. I have bought both types but do not quite understand the difference when it comes to which one I should use to "build/fill" up cavities and cracks before finishing the final surface with plaster?! Which one do I use when I am going to lay, for example, Leca?!

I am used to mixing myself with gullex but now I am using pre-mixed for some small jobs at home.

 

[Stefan N]

The B beam is stronger and should be underneath.

 

[MrMinkhe]

B bruket är starkare och ska va underst.

Thanks for the quick response Stefan! Then I suspect it's the one I also use for masonry.

 

[useless]

B is harder than C (which is harder than D). B is used for building breeze blocks, C for plastering. If the construction is fairly protected and has no strength requirements, C can be used for both building and plastering.

 

[MrMinkhe]

B is harder than C (which is harder than D). B is used for building with lecablock, C for plastering. If the construction is fairly protected and has no strength requirements, you can use C for both building and plastering.

Thanks! Now I've filled a crack behind the net with B but plan to apply C on top to finish plastering. Can I apply it when the B mortar has started to dry a little, or do I need to wait until it's completely dry considering the strength?

 

[useless]

I should have waited at least a day and soaked the surface thoroughly before plastering. But I'm not a pro...

 

[MrMinkhe]

I would have waited at least a day and wetted the surface thoroughly before plastering.
But I'm no pro...

Thanks for the great response!