Floorboard screw recommendation

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Hello all,

About to install some 19x145mm soft wood floorboards square edge. Rather than nail I would prefer to screw, I see there are some small head screws, some with twin threads etc.....just wondering if anyone has any recommendations?

Thanks
 
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I wasn't sure about the twin thread, they do pull the board tight?.....need 50mm wouldn't I for 19mm boards?
 
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They do other sizes, twin thread stops it working loose over time. Could use T STAR if your worried about tightening.
 
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Always used 1&1/2x8 screws. With modern screws any screw that has threads close to the top will cause 'Ramp-up' unless every board is clamped down every joist before every screw is put in. Eventually you will have creaks and most probably an un-level floor.

For small head screws I'd suggest these
https://www.toolstation.com/spax-wirox-t-star-plus-solid-wood-flooring-screw/p19502

Do you think I'd need the 45 or 55 for 19mm square edge pine contractor flooring? I always thought it was the 1/3 rule, so it would be the 55, but not 100% sure as never used these fixings before.

Also reading the description of these screws are they actually meant for the type of flooring I'm using, its written in such a way it could be both solid wood & t&G or maybe they mean solid wood T&G....
 
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yes normally 1x1+50% [2.5 times]so 19+19+9mm so 45 or 50mm [47mm]
but that includes perhaps 20% give or take with no problem as belt and braces :D
so 35-40mm would probably give you sterling service without a problem but at that level problems are far more likely to happen so your choice really ??
 
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These guys are only available in 45 or 55mm so thats my choice, with a T10 drive, old hard as hell joists may be asking for trouble with a 55mm length @3.5mm dia so should try the 45mm I think.
 
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