Subfloor height difference
#1
Member
Thread Starter
Join Date: Apr 2018
Posts: 2
Subfloor height difference
Hi everyone,
I’m 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
I’m 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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#2
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 18,724
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.
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
Member
Thread Starter
Join Date: Apr 2018
Posts: 2
Thanks that sounds a much better suggestion: I’m not sure why I’d not considered just using 22mm sheet originally.
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