Ply suspended floor

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12 Apr 2012
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Worcestershire
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United Kingdom
I'm just about to start work on my dining room and want to replace the floor. The current floor is a mix of chipboard and original floorboards (circa 1890).

There is a little bit of bounce in the middle of the floor which I'm hoping to take out. There is a single thickness brick wall running the full length of the room under in the middle to support the joists. Hopefully once the floor is up I can pack this a little if it needs it anywhere.

I intend to replace the whole floor in 18mm WBP and then put an underlay on top followed by a nice engineered oak floor.

When I'm fitting the ply sheets do I need to put noggins inbetween the joists and if so what thickness wood should I use?

Finally, there is a slight slope to the floor, which I'm not going to worry about if it is flat. However if the slope has a slight curve to it I'm worried that the new engineered floor will creak and bounce. What sort of margin would be OK? I dont really want to have to reset or replace the joists if I can help it.

Thanks in advance.
 
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I'm also planning to staple chicken wire under the joists and then lay rockwool type insulation down while I'm at it.
 

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