Nominal generally refers to pressure treated wood.
4x4 Nominal fits 3.5" x 3.5" Post Size
5x5 Nominal fits a 4.5" x 4.5" Post Size
6x6 Nominal fits 5.5" x 5.5"
8x8 Nominal fits 7.25" x 7.25"
Actual general refers to rough lumber (not surfaced on 4 sides) or vinyl or composite posts.
Some of these post may still measure between 'Nominal' and 'Actual' sizes, particularly in Cedar material.
Call 800-555-3694 for pricing, Sold In full pallet quantities only. The cost of our Shiplap Style Log Siding is very affordable per lineal foot. Log Siding and half log siding for homes, interior and exterior are manufactured for easy installation.