1. 

   diy32 New Member

   I am installing 18mm engineered flooring in my lounge, which has 18mm exterior ply fixed to floor joists which are 600mm apart, I am using a flooring nailer, I have some 5mm thick silver backed underlay which I was going to lay underneath, is this needed or a bad idea any advice please

    

   diy32, Jan 4, 2015

   #1
2. 

   joinerjohn1 Screwfix Select

   I think you'll find that the underlay is unnecessary. Just nail it directly to the ply.

    

   joinerjohn1, Jan 4, 2015

   #2

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