12x 20 on both sides of the house. (CMC Chapter 7). IRC R319.1 & IBC 2304.11 Connection Diagrams: FIVE DIFFERENT TECHNIQUES. Covenant and easements are generally covered by local building departments. The piers need to be placed at a proper depth to the slope, (some require a soilsengineer). Clay, silty clay, silt: Clay particles will remain suspended in water for a day or longer. The concrete piers are the foundation for your deck. Pay Fees. 9.7 Solid block all joists at ends and intermediate supports with full-depth solid blocking not less than 2 inch nominal thickness. (R502.4). Ledger board width must be => deck joist width but =