Sand and cement render

We have removed an old fireplace surround and blocked it up with timber frame and 18mm ply 900mm x 520mm.. looking to render the whole area including the ply 1200mm x 950mm.. To sand cement render over ply do i need to seal it with PVA or Bluegrit? And add an EML?

Asked by Mark on 3rd Apr 2024
Expert Trade Answers
"You will need to felt it ,then use stainless steel mess and scratch coat then when dry apply a top coat of render"
Answered on 3rd Apr 2024 - Member since Oct 2023 - report
"Should have used cement board if your are putting sand and cement on it, but if you put roof felt them eml over the ply, it will work, we used do this before cement board was available, chimney will also need to be vented so you don't get damp issues"
Answered on 3rd Apr 2024 - Member since Jan 2024 - report
"you need to put building paper{tyvek or similar} over the ply first then EML and scratch the wall. No PVA or similar needed. Bearing in mind when rendering over ply like this it pulls in very fast.
Hope this helps
Answered on 3rd Apr 2024 - Member since Feb 2023 - report
"Cement boards would be better if not u will have to use eml"
Answered on 3rd Apr 2024 - Member since Aug 2021 - report
"It will need metal mesh stapled on Blue grit is only for plasterboard, PVA or dry up and sand and cement Window fall off"
Answered on 3rd Apr 2024 - Member since Jan 2019 - report
"Hi there I don’t think is ideal to render over wood you should of used cement board cheers thanks"
Answered on 22nd Apr 2024 - Member since Aug 2023 - report
"Both will do the same thing really and both will be suitable for your needs"
Answered on 16th Apr 2024 - Member since Feb 2024 - report
"The first time you have a chance at the top is the second one you get a free pass and you can go on"
Answered on 23rd Apr 2024 - Member since Apr 2024 - report
"Hi I wouldn’t recommend sand and cement on top of wood
It will
Only crack in time !

Maybe put some battern in and use some cement board then apply the sand and cement render"
Answered on 13th May 2024 - Member since Apr 2024 - report
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