Subfloor height difference


  #1  
Old 04-03-18, 12:03 AM
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Subfloor height difference

Hi everyone,

I知 installing a new 22mm tongue and groove subfloor for an engineered wood floor. The room was previously two rooms that have been knocked together, and there is a height difference of around 22mm between the two. The first layer of subfloor is down and I plan to sheet over the lower of the two to create an underlayment to bring it up to level, and would appreciate advice on suitable materials: my current thoughts are some 8x4 sheets of 18mm OSB3 and then a layer of 4mm ply or hardboard, but would like to hear what other people think. Given that this is in a kitchen would some sort of membrane on top of the underlayment be a good idea to protect against spills, or would a good quality underlay handle this?

Many thanks,


Stu
 
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Old 04-03-18, 05:00 AM
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Why not use the same 22mm thick material throughout instead of trying to make up the thickness with two sheets of other materials?

I would not install a waterproof membrane. Your floor isn't going to be waterproof so I don't see any benefit. If there is a water leak the membrane will trap the water and cause it to spread.
 
  #3  
Old 04-03-18, 06:01 AM
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Thanks that sounds a much better suggestion: I知 not sure why I壇 not considered just using 22mm sheet originally.
 
 

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