Replies

1. 
   rez | Oct 13, 2007 02:32am | #1

   Greetings canoe,

   This post, in response to your question, will bump the thread through the 'recent discussion' listing again which will increase it's viewing.

   Perhaps it will catch someone's attention that can help you with advice.

   Cheers

    

1. 
   canoehead2 | Oct 13, 2007 02:42am | #2

   Thanks for the bump

2. 
   Matt | Oct 13, 2007 05:44pm | #3

   Just to get the conversation going...

   When you say "fibreboard" do you mean MDF or what?  What thickness of underlayment are you wanting to use, and why do you want to use underlayment?  Subfloor uneven?  Subfloor need to be strengthened?  Additional height needed to match up new floor with other floor covering?

   If it is MDF you are talking about, a few advantages are that it is extremely flat and uniform and contains no voids like some plywood does.  Disadvantages are that it doesn't do well in damp environments and it does off-gas VOCs.  Also, I'm not sure how well MDF would hold the strip floor nails - I don't know, maybe you just want a thin layer which would allow the nails to penetrate the subfloor.  I've never heard of using MDF for underlayment, but I may not be the right one to ask - the houses I build have good subfloors so there is not a need for underlayment under strip hardwood flooring.   Under tile we use cement board and under vinyl flooring we use a special plywood underlayment called Multiply.

    

1. 
   canoehead2 | Oct 13, 2007 08:49pm | #4

   I'm looking for 1/4" underlayment to bring my hardwood floor up to 1" to allow for a flush adjacent tile installation.

   I'm used to seeing this stuff done in sanded, thin-ply poplar plywood but saw a stack of what looked like fibreboard.  Not as dense or hard as MDF.  Didn't seem to have as much glue/binder in it as MDF.  The stuff wouldn't hold a nail but that's OK since one would nail into the subfloor (3/4" ply in my case).

   I didn't catch a brand name for this stuff.