Simpson PPB44-4Z 4X4 Porch Post Base 4" Depth, ZMAXModel No. PPB44 4Z Gauge. 12 Width 1 (in.) 3 5 8 Width 2 (in.) 3 3 8 Height (in.) 5 3 4 Depth (in.) 4 Coating Material. ZMAX The PPBZ porch base offers a simplified, one time installation designed to support permanent porch framing throughout all stages of construction. This design eliminates the need for temporary vertical support and streamlines the subcontractor scheduling process while still providing adequate safety to enable full access for