Support Design

After thinking about it, I've come up with a design for supporting the stairs that will provide both load support and lateral support.

Basically, I'm going to create 4x4 posts by gluing and screwing two 2x4s togegher. One 2x4 will sit directly underneath each beam, and the other will extend up beside it, and will then be attached to the beam with 4 screws in a box pattern. There will be blocks between the posts to add strength. These posts will carry down to a toe-plate that will have a plastic gasket on its underside to separate it from the concrete to prevent moisture absorption. The toe plate will subsequently be anchored to the floor with mechanical anchor bolts.

I have all of about 15 2.5" screws left, so it's off to Home Depot yet again for fasteners.