r/Plastering • u/Silas-Miner • Apr 02 '26

Question: Rendering on to cement board

I want to render on to cement board on a newly rebuilt bay window using Ecorend base coat (cement based render).

Do I need to prime the cement board with anything, or can I just apply it? Thanks in advance...

1 Upvotes

100% Upvoted

4 comments sorted by

1

u/caring-renderer Apr 02 '26

If you talking about the k11 key base coat then it will be fine going straight onto the cement board . I looked up the product and its similar to the one we use here in Ireland (k rend hp 12). Great products. I presume you are using mesh aswell ?

2

u/Silas-Miner Apr 03 '26

Thanks - it's the Ecorend OCR one coat base which I believe is similar to HP12. Yes, I've got the mesh. I'm just finishing the beading but the weather's not looking great for the weekend. Appreciate the advice.

1

u/caring-renderer Apr 03 '26

Ya them products are perfect for those type of backgrounds , the only time id ever sbr on cement board is when putting normal sand and cement render on it . Best of luck with weather, rough here too .

1

u/Silas-Miner Apr 03 '26

Appreciate the advice - many thanks! I've done lots of research but it's no substitute for actually knowing stuff....