A seal assembly is mounted to a floor portion of an RV with a slide out room. The slide out room has a wall and a floor that is separated from the floor of the RV. The seal assembly has a floor portion, a separate wear bar and a separate bulb seal. The floor portion has a mounting portion that receives the wear bar and an exterior leg that connects the bulb seal using a tongue and groove. Fasteners connect the wear bar and floor portion to the floor of the RV. The floor portion includes a wiper that extends upwardly from an inner lateral edge. A catch wall extends adjacent the wiper and cooperates with it to form a trough for drainage. The catch wall can receive a corner piece to direct drained water to the outside of the RV.