Plaster Skim Coating Directly onto AAC Blocks?

[firewight]

Hi guys, a basic question, we have some kitchen cupboards and under counter areas in the new house build that are still raw AAC Blocks. The original idea was to have these areas tiled, however I have changed my mind on that and just want to plaster skim the walls, primer and paint.

The rest of the house was cement rendered, and then plaster skim coat was applies, sanded & primed.

I understand that these terms (render, plaster, skim coat) seem to get get used interchangeably here, however in AUS where I am from, and subsequently in my house build, and this post, cement render is grey cement applied and smoothed onto the bare AAC blocks, plaster skim coat is a thin white plaster layer applied on top of the render to remove any roughness, which is then sanded to a smooth finish and primed prior to painting.

 

My question is, can you plaster skim coat directly onto AAC blocks and bypass the cement render stage? As mentioned, these are inside cupboards and under counters, which will rarely be seen.

Any thoughts would be helpful.

Cheers!

Cement Render

 

Plaster Skim Coat

[Slowhand225]

No.
You always need the scratch coat (render)

[firewight]

4 hours ago, Slowhand225 said:

No.
You always need the scratch coat (render)

Thank you, however it would be more helpful if you could elaborate as to why that is required?