Is it OK to add 3mm hardboard between joists and plywood flooring? I
have to replace some damaged floarboards I have removed and they seem
to be 21mm deep, so adding some 3mm hardboard on top of the joists
will mean I can use 18mm ply.

Is the hardboard compressable? Will it suffer from damp?

Mr F.

Mr Fizzion wrote:

> Is it OK to add 3mm hardboard between joists and plywood flooring? I
> have to replace some damaged floarboards I have removed and they seem
> to be 21mm deep, so adding some 3mm hardboard on top of the joists
> will mean I can use 18mm ply.
>
> Is the hardboard compressable? Will it suffer from damp?
> 
> Mr F.


that'll work.

NT

Mr Fizzion wrote:

> Is it OK to add 3mm hardboard between joists and plywood flooring? I
> have to replace some damaged floarboards I have removed and they seem
> to be 21mm deep, so adding some 3mm hardboard on top of the joists
> will mean I can use 18mm ply.
> 
> Is the hardboard compressable? Will it suffer from damp?


I've done the same myself, no problems.

But why are you concerned about damp?  If it gets wet, then yes, 
hardboard is horrible stuff, but there shouldn't be any damp between a 
joist and the floor it supports - if there is, than an uneven floor is 
the least of your worries!

David

Mr Fizzion wrote:

> Is it OK to add 3mm hardboard between joists and plywood flooring? I
> have to replace some damaged floarboards I have removed and they seem
> to be 21mm deep, so adding some 3mm hardboard on top of the joists
> will mean I can use 18mm ply.



It's fine.

In article ,
   Mr Fizzion <wankel@rotary.engine> wrote:

> Is it OK to add 3mm hardboard between joists and plywood flooring? I
> have to replace some damaged floarboards I have removed and they seem
> to be 21mm deep, so adding some 3mm hardboard on top of the joists
> will mean I can use 18mm ply.


Yup - that's the common way to pack floorboards.


> Is the hardboard compressable? Will it suffer from damp?


Since it's basically wood it will have similar properties in this respect.

-- 
*The most wasted day of all is one in which we have not laughed.*

    Dave Plowman        dave@davenoise.co.uk           London SW
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