A lot depends on what type and size wood you are using. Screws are usually better. If you use nails, ring or spiral are better than common There are so many elements involved with stairs, you want to do everything possible to prevent squeaks cause if you get one, they are generally difficult to get rid of.
ie. for one inch plywood treads 8 penny would likely work but I use 3" (10 penny). For 1 1/2 wood, use 3 1/4 to 3 1/2". Glue and screw is the best.
Good luck.
You're a regular I see, how's it goin.
------------------
Bart Blainey, B.E.R.
Consultant/Journeyman Carpenter
Building Envelope Specialist
Master Renovator
provip@prodeck.org
http://www.prodeck.org
Barton Blainey (provip) specifically assumes no legal liability or responsibility for the accuracy, completeness or usefulness of any information or process disclosed. The above further expressly advises that any use of or reliance upon the information and or opinion disclosed is at your risk .
_________________________
Bart Blainey, B.E.R.
Consultant/Journeyman Carpenter
Building Envelope Specialist
Master Renovator
provip@prodeck.org
http://www.prodeck.orgBarton Blainey (provip) specifically assumes no legal liability or responsibility for the accuracy, completeness or usefulness of any information or process disclosed. The above further expressly advises that any use of or reliance upon the information and or opinion disclosed is at your risk .