Re: sistering a new joist
Diameter isn't the issue; it all comes down to shear strength. A nail will bend, a screw will snap; it has continuous stress risers built in. That's why it takes 1/4" screws (like timberlocks, etc.) to equal the shear strength of 16d nails.
Originally Posted by jkirk
Remove not the ancient landmark, which your fathers have set.