Suspended Chipboard Floor Support

29 Nov 2008
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United Kingdom
Hi guys

Downstairs suspended floor, 2x9 joists, 400mm centres with span of approx 4.8m with chipboard on top.

Currently it wobbles around when walked on.

1. I've lifted a board and joists look sound but 2x9's in size seem under spec'd to me?

2. There are no noggins so my plan is to put 3 or 4 rows in. Does that sound ok?

3. In the crawl space underneath there is a level concrete base maybe 4 ft down. Is there any reason why i cant add some vertical supports standing on this to the under side of the joists?

MOD: Pooh edited slightly.
Last edited:
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Yes your imprecise and rude analogy aside there should be maybe even 4 rows, either solid blocking or herring bone struts. This would mean any load on one joist is shared with adjacent ones and the relative deflection will be reduced assuming that's the issue you're seeing!
The vertical support might help and would probably work but without proper design it wouldn't be rated to provide structural support
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The world has gone mad. Using the words 'fat' and 'lass' in the same statement is clearly too much for public consumption.

I had merely drawn this tongue-in-cheek comparison between the deflection of my floor with that of the wobbling excess weight of a big boned lady. No swearing or nuffin.

Please ban me. It clearly deserves more punishment than someone deciding what language I am allowed to use.

Is this site operated from within North Korea?
Fat bottomed girls make the rocking world go round - apparently. There is at least one member here who will attest to that.
No problem, glad you appreciate our time and effort!:rolleyes:

I'm yet to read one that wasn't my own suggestion in my original post.

I'll not post again in this thread, its obviously very important to you to be able to have the last word, even if you end up having to make up quotes to facilitate this.

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