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How to build non-creaky first floor?


WWilts
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18mm tongue & groove chipboard being considered, glued to 400mm centre joists and screwed with Spax at 150mm centres. Expansion space at junction with walls 10mm

Is 22 mm (vs 18mm) chipboard necessary?
Can either the glue or the screws be omitted without making the floor creaky?
Is 10mm expansion at floor perimeter about right?

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I used 22 mil at 600 centre 

3 years on No creaks 

If you use plenty of glue it should be fine 

While it doesn’t look pretty with glue all over the joists below You do need to make sure that every joist is well coated 

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Monitor where walls meet floors, a lot of noise actually comes from a 'silent floor' with a bit of flex in it...but stud walls sitting on them & skirting boards etc rubbing against the floor creating the noise.

 

I cant suggest a fix (I only ever drove screws in between floor:wall flex after we moved into mass produced new builds) - but one to explore/think about as well.

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