15ga or 16ga nailer for T &G ceiling install- 15 ga finish nailer uses ,I have a Bostich N60 that shoots 15 ga nails and was purchased 19 years ago that needs to be lubed, nice gun. However I don't think you need to use 15 gauge for your application. I use the 15 gauge for floor installs. A 15 gauge nailer can and will split oak tongue ...Brad Nailer vs Finish Nailer - Difference Between15/2/2018· A brad nailer uses 18-gauge brad nails that are 5/8 inches (15.9 millimeters) to 2 inches (50.8 millimeters) in length. It is primarily used for lighter wood trims such as casings, moldings, doors, and even handicrafts. Finish nailers are often used to drive 15 and 16-gauge nails on thicker wood projects such as cabinets and dressers.