What Size Nailer for Baseboards? (15, 16 or 18 Gauge)- nail size for baseboard trim ,12/12/2020· Applying the baseboard to the wall normally means using 15 or 16-gauge nails from a nailer or nail gun. You simply line up the baseboard on the floor and attach them to the wall. You may need to cut a miter or trim the baseboards that wind up near a door or corner of the room or hallway. Drive the nails approximately 12 to 16 inches apart.Can you install baseboards without a nail gun?13/3/2020· Senco has two air free cordless nail gun options for those on a tighter budget with no compressor.The Senco Air Free 25 and Air Free 41 are battery powered nail guns that make finish and trim work go fast.The Air Free 25 is good for lighter jobs and is capable of driving around 1,000 nails per charge of the battery.