The Pressure Treated Pine that we supply is without a doubt the highest grade PTP that is available today. What we sell is a #1 grade DSS (Dense Select Structural) which is at the top of the list in the Southern Pine Inspection Bureau Standard Grading Rules for Southern Pine Lumber. This creates a pine pergola of exceptional strength and durability.
Here are the major advantages of Pressure Treated Pine Pergolas:
Ground contact lumber (meaning that every component of the kit, even the 2×2 top slats, is made with lumber that is designed to be able to be buried in the ground for the life of the lumber without rotting)
Twice the density
Twice the strength, meaning you can make longer beam and rafter spans between support posts without sagging
Very few knots
Very low amount of edge wain. Usually none.
Not as prone to warping and cracking due to it being cut from a slow grown tree
This is marine grade lumber for use above the water line
Safe pressure treatment (does not contain arsenic)