I'm replacing my entire front porch using 3 1/8" wide fir planks. These are the exact type of boards I'm removing. The old porch was painted w latex paint and ended up rotting out--though I thought I kept on top of it--I dont want this to happen to the new wood. The local advice I'm getting is seal entire board with oil base primer (tongue and groove should be assembled with the primer wet to help seal joint) Then cover top and end with 2 coats of armorseal tread-plex. Should I make the tongue and groove joint tight or leave some room for expansion (this will be an April project in Pennsylvania--I plan on priming entire planks then moving them outside to an unheated shed for a week to acclimate. Can I use my 16 ga nailer or must I use the hammer in twist nails recommended by the lumber yard--the project is not big enough to justify renting a nailer -- 6'x30'. Any thoughts?