Sand and cement render

Question

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?

Stuart · Accepted Answer

You will need to felt it ,then use stainless steel mess and scratch coat then when dry apply a top coat of render

Jamie · Answer

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

Mark · Answer

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
Mark

Nicky · Answer

Cement boards would be better  if not u will have to use eml

Glen · Answer

It will need metal mesh stapled on Blue grit is only for plasterboard, PVA or dry up and sand and cement Window fall off

Jordan · Answer

Hi there I don’t think is ideal to render over wood you should of used cement board cheers thanks

Scott · Answer

Both will do the same thing really and both will be suitable for your needs

Ionut · Answer

The first time you have a chance at the top is the second one you get a free pass and you can go on

Shawn · Answer

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

Sand and cement render

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