How thick should render coats be?

What he’s done is right, but honestly there no right or wrong answer here everybody got a slightly different option there is no set british standard as far as I’m aware besides two coats the first consisting of a scratch coat. Both layers of render can’t be too thick or thinner, no thinner then 5mm no thick then 10-15mm. As long as it’s flat, smooth and doesn’t crack does it matter the technique used the end results are all basically the same give or take. Regards Frankie BT Roofing Services

I prefer my scratch coat to be 8-10 mm with a waterproofer , only having some lime in the top coat around 10-12 mm each successive coat should not be stronger than the previous coat . If you’re rendering a timber construction it’s best to use a hair, chalk and lime mix which will breath and not hold the moisture unlike cement and sand based mixes which can eventually cause the timber to rot. There’s a lot can be said about rendering this is just my 40 years experience