How do I level this bit of chipboard subfloor?

[redhexagonal]

I need to level this bit of chipboard sub floor by the wall to lay engineered flooring. Its about 1.5m by 0.3m in the centre. The deepest bit is 15mm too low, the rest is mostly alot less but more than 3mm. Its glued and screwed in place so I don’t want to take it up really. Its not in a high traffic area. What are my options?

I need to level this bit of sub floor by the wall to lay engineered flooring. Its about 1.5m by 0.3m in the centre. The deepest bit is 15mm too low, the rest is mostly alot less but more than 3mm. Its glued and screwed in place so I don’t want to take it up really. Its not in a high traffic area. What are my options?

 

[Koolpc]

Self levelling compound?

 

[redhexagonal]

Self levelling compound?

What kind do I need for chipboard? Do I need to prime it or something?

 

[dazlight]

I’d go ardex na
But Mapei renovation will do. Yes prime 1st

 

[redhexagonal]

Thanks I was just looking at that one (Mapei, I can’t see Ardex anywhere local) . What kind of primer do I use first? There are so many!

 

[dazlight]

Buy the Mapei prim grip

 

[redhexagonal]

Buy the Mapei prim grip

That stuff is like twice the price of the screed. Is there something special about it? I have a tub of yellow pre grit primer for plastering, was thinking that might work?

 

[dazlight]

Should do yes. I take it you are floating the wood floor ?

 

[redhexagonal]

Should do yes. I take it you are floating the wood floor ?

Yes, its click 14mm flooring on duralay. So if I understand, the point of the primer is to stop the screed drying out too quick and provide some adhesion? And the yellow grit stuff can also do that