Loft conversion flooring question

[paulrockliffe]

I actually thought the first ones look OK, I wouldn't use the second as the heads are too small - they're some sort of hidden screw that would be for a finished floor rather than chipboard aren't they?

Wont that design allow for the smooth shaft to remove jacking and then the final threaded bit to stop the board squeaking against the screw?

 

[Deleted member 174758]

I actually thought the first ones look OK, I wouldn't use the second as the heads are too small - they're some sort of hidden screw that would be for a finished floor rather than chipboard aren't they?

Yes. I've used them on plywood flooring which was to be overcoated with flowed-on resin (2-pack) flooring and where the requirement was for minimal filling as that interferes with the resin

Wont that design allow for the smooth shaft to remove jacking and then the final threaded bit to stop the board squeaking against the screw?

Yes, that's what they are meant to do. They work better than chipboard screws in environments where you can't guarantee holding the board down adequately to avoid jacking (or where screwing unpiloted and/or using a lower powered drill). I've screwed down enough 18/22mm chip and plywood flooring with collated flooring screws (square drive, full thread, no reverse thread at the top) to know that with full thread ("chipboard") screws requires a goodly amount of downwards pressure to avoid jacking