JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Add a Quadrilateral Load form Used to create a quadrilateral load. Quadrilateral Loads are plate pressure load and only applicable to mat foundations. Note: Quadrilateral loads are for mat foundations only. Opens when Loads & Factors > Add Load for Mat Foundation > Quadrilateral Load is selected in the Main Navigation pane. Creating a quadrilateral load Parent topic: Loads & Factors group