Cut clasp nails splitting joists

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Hi all,

I am now having a BIG PROBLEM with the nails! They are going in to the boards nicely but are spiting the joists. Not sure it it is safe to continue as I don't want to weaken the whole floor.

Should I pilot hole? I already tried with a 3mm bit and it still split. Perhaps I should abandon and switch to screwing and plugging/filling??

In the below image you can see the nail compared to the board and the drill bit. The red line marks where the bit ends



Read more: //www.diynot.com/diy/threads/scaff-board-floor-what-nail.471952/page-2#ixzz4Ri5iOzoc
 
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Cut nails will split timber as thin as scaffolding board because the rectangular cross-section causes high stress
on the grain and forces it apart. That's why smooth round-wire and (later) oval nails were developed, to avoid splitting the timber; they tend to 'ease' themselves through the wood. Large cut nails are only really suitable for thick structural timbers.
 
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