Our deck that runs along the lake has a trek railing, top and bottom railings and main posts. We installed vertical black metal balusters. It has been sagging now for awhile. We tried placing blocks underneath but top railings sagged. We took down all the railings to repair but not sure what to do. We want to rework what we have to save money. Also, we want to put posts on top of the decking. Is that safe? Just FYI. Our decking runs the length of the water, maybe 50 feet and is about 3’ wide.