Raise concrete floor

[Anish Mackan]

Hi, I have three bedrooms in a bungalow where the bedroom floors are now about 20mm below the floor level in the hallway. the hallway was recently tiled which has caused the drop. all rooms have a concrete floor that's in good condition. im looking at the best way to raise the floors in these rooms by 10mm as the carpet and thick underlay that I have chosen will bridge the difference. im thinking of laying down 10mm cement/tile backer boards and then the carpet underlay and carpet on top. Do you have any thoughts on this approach? if it's viable, how do I secure the boards to the concrete? Can I glue them down or screw them or leave them without any adhesive and just tape up the joints. Thanks

 

[Jake2021]

Forgive me if I missed it are your floors currently concrete or wood?

 

[Anish Mackan]

floors are concrete

 

[Jake2021]

Just pour some self levelling on them

 

[Jake2021]

https://www.screwfix.com/p/no-nonsense-floor-levelling-compound-20kg/453HU?tc=RT4&gad_source=1&gbraid=0AAAAAD8IdPzyVY2_gHjty5BE5AEi8E9nq&gclid=EAIaIQobChMIvuOM-c2FiAMVSI9QBh0QmwgqEAQYASABEgIatfD_BwE&gclsrc=aw.ds