Is AC Dimmer on Vector Board trouble?
Vector makes many kinds of boards, from pad-per-hole to various styles of holes connected by strips of copper.

In any case, the "creepage" distances between adjacent pads/strips is not all that large, so I would recommend leaving several (not just one) unused pads/strips between circuit nodes that have 120VAC across them. And be sure to clean any unused flux/rosin off the board when you're finished soldering.

In a pinch, you might consider using the heat of your iron to delaminate and remove unused strips between high-voltage nodes.