If there are no bugs and the is no Rot, the You Need to Repair The Shot Floorboards. The Place Where the Lags are Easy to find by the location of the nails. It is Necessary to circle with Chalk the place that needs to be Changed and Remove event with scrap. IF YOU CAN CANT REMOVE THE BOARDS, You can use a circular saw. We Make Holes Next to the Lag, The Make Several Tiles On Both Sides of a Bad Site. Thanks to the bad Area Done, it Will Easily Remove. NEXT, You Need To Prepare the Brand New Support for the Boars. The IT Remains Only to Make the Boars Themselves and Attach The Boars with Nails.