Pressure Treated Fence Pickets – The southern yellow pine treated with pressure is one of the most popular woods use in the construction of fences. It is available, inexpensive, and has a long life if properly install. Most southern yellow pine trees treated with Quaternary Copper Alkaline. The process of “treating stress” involves soaking wood in chemicals and placing it in a pressure chamber. Pressure causes chemicals to penetrate wood. The retention rate only means how much chemicals store by wood. The higher the retention rate, the better the resistance to the element. Different external projects require different retention rates. Marine grade wood, used for docks or ships in salt water or brackish water, has a retention rate of 2.5. Acid wood, or wood placed on the ground, has a retention rate of 0.40. Use wood outdoors such as 2×4 and pickets a retention rate of 0.25.
Wood looks the same and seems like a good way to reduce material costs. Unprocessed landscape wood to be placed on the ground around moisture. This will cause the wood to become weathered and brittle, and ultimately damage basic services. Pickets and 2×4 must be assessed for external use, or retention rates .25. They are not under class, this assessment is suitable for their use. You might want to pick up a picket one inch from the ground when install it so they don’t touch the ground directly. This will prevent pickets from absorbing moisture from the soil which causes swelling and decay. Even though you need the right retention rate, you don’t need to do it again.
Retention of 0.25 for the central NC area for pickets and 2×4. No need to spend time hunting wood with a higher retention rate and paying more for it. Some case when do so can cause violations. The EPA orders all marine, or wood, grade with a retention rate of 2.5 to place in brine or brackish water. If not, they can give you a fine. The level of chemicals is too high for normal use and can contaminate the surrounding soil and water sources. Building a fence make sure you get wood with the correct retention rate. The keyword is “right”, not too low and not too high. The retention rate in this article fits the Raleigh area in North Carolina. If you live in various parts of the country, you might want to check local building codes for retention rates in your area.