Sand Cement Render Internal

[EdTurtle]

Hi, just a quick question.

I have bare block walls that i am going to float and set. No doorframes or other to work off like i normally have so going to do box screed in sections.

What is the thickness supposed to be for each coat, 10mm each, so total of 20mm then 3mm multi finish? Is that to thick though, could it be more like 15mm s&c then 3mm multi?

Many thanks

 

[ree]

OP,
Best practice with a render mix is a 3:1 sand & NH lime.
Why are you rendering internally - has there been a damp issue or are you doing it traditionally?
Can you or someone else fix permanent skirtings, and even temporary reveal linings - it would make the job so much easier.
10m coats are correct for rendering.

 

[JohnD]

In my area, it is traditionally 3/4" thick, but 18mm will do.

Years ago they used a lime render internally and modernised to use S&C. It has a hard plaster skim.

It is a coarser sand than bricklayers use, with less cement so rather open texture. It is said to resist damp and shrinkage cracks.