do you start at the building and work outward

Hello! Thank you for taking the time to contact Trex! Where you begin working on your decking is personal preference. Our best recommendation is to begin on the outer perimeter and work your way towards the ledger (house, wall, etc.) in case a board has to be ripped down to fit. I hope you've found this information helpful! Please contact us here at Trex if you have additional questions! Thank you! - Trex Customer Care Team