To infuse these preservatives the wood is immersed and placed in a pressure chamber.
Best pressure treated wood for ground contact.
The ratings are based on the amount of preservative used to treat the wood.
Wood treated for above ground is intended for parts of your project that meets all of the following criteria.
Cca retention levels were 25 for above ground use and 40 for ground contact.
There are many different types of wood lumber and grades available at your local home improvement store so it is important to know the important items when purchasing the materials for your repair.
Uc4b gound contact heavy duty wood and wood based material used in contact with the ground in severe environments and in climates with a high potential for deterioration including permanent wood foundations and wood used in salt water splash zones.
Micropro ac2 pressure treated wood products are available for above ground ag ground and in ground contact gc and ground contact for critical use gcs applications.
Pressure treated wood is wood that has been treated with chemicals to help it resist weather and insect damage and there are many things to consider when trying to choose the best.
Heavy duty ground contact treated wood should be used for.
Heavy duty ground contact.
Store as the names suggest ground.
Pressure treated posts should be rated for ground contact awpa grade uc4a for general purpose or uc4b for heavy duty.
4x4x8 pressure treated 2x6x8 pressure treated southern pine pressure treated lumber ground contact pressure treated lumber 1x6x10 douglas fir 1 6 pt.
But now retention levels vary depending on the preservative used.
Certain chemicals such as the water repellent ca c copper azole type c also makes the wood suitable for ground contact even in marine environments.
Use uc 4a or uc 4b treated lumber for the best below ground option.
For example a typical wood treatment is micronized.
Pressure treated lumber has been treated with chemical preservatives to help prevent rot and insect damage.
Posts supporting houses garages sunrooms barns or other permanent structures in ground concrete or fresh water salt water splash.
Geoff case home depot s merchant for decking and pressure treated lumber explained.
The 4a or 4b rating should be clearly marked on the lumber s end tag.
If the lumber has been treated by the awpa check for posts that have a uc 4a or uc 4b label.