Screwing down old square-edge floorboards

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Hello.

Am looking for a steer on the screws I'll need for replacing old 19mm square-edge pine floorboards onto the joists.

The boards are going to be sanded so will need to be 2-3mm countersunk. I'd quite like small heads but not at the expense of them pulling through.

I started with some Turbo TX 4mm x 50mm because I thought they'd be better than cross-headed ones but got a bit nervous when the heads on a couple of them got mangled when I tried to remove them.

Looking at Toolstation there's Floor Tite Tri Lock Pozi Screw and Spax Wirox but only in 60mm so probably too big. Screwfix do one called Optimaxx 4 x 50mm

Not sure if I'm over-thinking it but tips on what to look out for would be good. Thanks!
 
Last edited:
The screws should be twice the thickness of the board plus the board depth so 60mm, in practice you can get away with less. I use the Spax wood screws because they are the best imo.
 
Thanks. Most of the reviews talked about chipboard, so I wasn't sure. Is it any Spax or a specific one?
 

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