http://www.homebuildingandrepairs.com Click on this link if you're interested in learning more about wall framing, concrete building foundations and home repairs. This video will provide you with a few examples that can be used for sealing the bottom of a wall framing plate or the bottom of an exterior wall that's sitting on top of a concrete slab. Not at the edge of a concrete slab like most construction, but about a foot or two from the edge. Remember these are only suggestions and you might need to check with local building authorities for more information.