http://www.homebuildingandrepairs.com... Click on this link to learn more about bathroom construction, home building and repairs. Most bathtubs are usually supported by the front apron or front of the bathtub bottom, back overhang and by either legs attached to the bottom or some type of fill material like Plaster of Paris or mortar. Don't forget to check out our website for more videos and ideas that can save you money on your next construction project.