Timber Floor On Concrete

**mol** · 27th April 2006, 06:55 PM

Hi!

I am laying solid timber t & g floorboards onto a concrete floor using joists.
The floorboards are 120mm x 22mm
The joists are 22 - 23 mm

Under the joists will be a poly membrane

The joists will be fastened with 50mm splitz

Because the floorboards are 120mm I'm told I can't secret nail

Because the floorboards are hardwood I'm told I can't secret nail

Because the floorboards are 22mm and the joists are 23mm I don't have sufficient clearance for top nailing (Apparantly the joists need to be at least 1 1/2 the size of the floorboards ie. 35 - 40mm)

Has anybody top nailed a floor using smaller T nails and been successful.

I've been told I could cut 12mm ply and glue under joists and this would solve the problem but then I'd have to take down the ceiling fans or lose my head.:eek:

Any recommendations would be appreciated.

**glock40sw** · 27th April 2006, 07:08 PM

Neil.
WHo the hell is feeding you this crap?

As I said before...go and see Timber Queensland in the valley.

Or http://www.timber.org.au
D/load the flooring installation and the other guidlines.
It will answer ALL your questions...

**echnidna** · 27th April 2006, 07:15 PM

Originally Posted by glock40sw

Neil.
WHo the hell is feeding you this crap?

As I said before...go and see Timber Queensland in the valley.

Or http://www.timber.org.au
D/load the flooring installation and the other guidlines.
It will answer ALL your questions...

**mol** · 27th April 2006, 08:05 PM

Hi! I got the info from timber.org and they say " only secret nail boards up to 85mm cover"

A floor layer said that because the wood was 120mm wide I can't secret nail and would have to put 2 nails in the top.

Boral Timber said, which everybody else seems to agree with, that the joists have to be 1 1/2 times the flooring depth to adequately put in a top nail without hitting the concrete and to hold the wood secure.

Can I use a smaller T nail?

**Gaza** · 27th April 2006, 08:36 PM

that rule is from AS1684 the timber framing code, i also think it has been transfered across into the timber flooring code.

it is industry practice to use ND brads 38mm with a 19mm flooring and 19mm hwd batten, also glue boards with ultraset.

its also common place to secrete nail first using a secrete nail gun this brings the boards in tight then go back and top nail.

what type of timber are you using.

**mol** · 27th April 2006, 08:44 PM

Hi!

The wood is plantonia

I think thats how you spell it

Its from PNG and is kiln dried

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