What is the easiest method for securing a wood sole plate on to a concrete basement floor?

 

If you have access to a power nail gun, these work well. They use a nailer, use special concrete nails desigend to work in the gun, and special .22 caliber gunpowder charges (of varying strengths) to drive the nails.

I've had good luck with the high-quality power nail guns, and not-so-good luck with the orange box cheapo guns.

If you go this route, use ear protection, as the charges are very loud.

Alternatively, you can drill holes (every 2 to 3 feet or so) through the bottom plate and into the concrete floor, and use expanding anchors to secure screws or bolts through the bottom plate and into the floor.

If you go this route, it is helpful to use a small diameter masonary bit to start all your holes through your bottm plate such that they mark the location on the floor. After you have started all you holes through each peice of bottom place, remove the bottom plate and advance the holes to the desired depth with the small masonary bit. Them come back and use a larger maronary bit (the proper size will be specified by the anchor manufacturer) and finish the hole to the proper size.