Engineered wood flooring, Yay or Nay?

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6 minutes ago, Temp said:

 

The only place I've seen it us in NHBC docs.. 

 

http://nhbccampaigns.co.uk/landingpages/techzone/previous_versions/2011/Part6/section4/sitework.htm

 

But that's not the same as building regs.

Building Regs = the law.

NHBC = an optional home warranty and insurance service.

[Temp]

I know the difference ?

 

Nothing like this is in the Building Regulations. It might be in one of the Approved Documents or the many  standards they refer to but I've not gone out of my way to look. I'm just reporting what I've heard, which is that people have purchased hased 14mm engineered oak and then had to put 18mm chipboard under it. 

[Temp]

I looked it up...

 

Approved Document A para 1.6 refers to BS 8103-3: 2009 "Structural Design of Low-Rise Buildings - Part 3, Code of Practice for Timber Floors & Roofs for Housing".

 

I didnt look very hard but could only find a 1996 edition of that for free. In that ...

 

Table 3 covers the thickness of plywood flooring needed for several different timber species. Thickness varies from 15mm to 18mm. 

Table 4 covers the thickness of chipboard needed 18mm for 450mm pitch joists and 22mm for 600mm pitch joists.