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  Reply # 988135 16-Feb-2014 11:04
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kiwitrc:
PeterQ: That is  not right,  screws and  glue are used constantly throughout the building industry as I do and screws are recommended


Builder mate just said the same thing, 50mm stainless screws and SB glue.


I wouldn't use stainless screws unless you drill pilot holes before screwing in, they are quite brittle so tend to break if screwed in too hard and might not handle stresses of joist movement. Normal square or multidrive screws with self countersinking head should be the ones since the floor shouldnt be getting wet anyway, and you will need a #2 square driver bit to match them on your drill/driver.

The advice about using nails seems to NOT allow for horizontal movement (am I wrong?) as the particle board expands, but the idea of filling a groove between each board with gorilla glue or something more flexible should allow movement the best since not gluing them hard onto the joist (maybe less effective for stopping the squeaks unless combined with some nails?). 




Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^



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  Reply # 988232 16-Feb-2014 14:06
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Thanks for all the comments and advice. I now have the carpet up and can see that the particle board was originally fixed with flat-headed galvanised nails punched below the surface. There doesn't seem to be a lot of them.

I have largely fixed the squeaks by driving Surefix square drive countersunk wood screws 8g x 45 mm at about 75mm spaces along each side of the edge joins, to secure the sheets back down to the joists. Also lines of screws mid-sheet where the original nails indicate that there is a joist below. The screws self-tap using my drill/driver and countersink themselves, so although I have a lot of screws to put in, it's a fairly simple process.

I haven't finished the job but already most of the squeaks have gone and it's big improvement. I think I'm going to be pretty happy with the job once it's complete. Haven't used any glue mainly because I don't think I need to.

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