Posts supporting houses garages sunrooms barns or other permanent structures in ground concrete or fresh water salt water splash.
Best pressure treated wood 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.
Heavy duty ground contact treated wood should be used for.
We re partnering with suppliers to convert certain wood products from above ground contact retentions to ground contact retentions in a rolling change that began in february and will impact nearly every u s.
Pressure treated posts should be rated for ground contact awpa grade uc4a for general purpose or uc4b for heavy duty.
Store as the names suggest ground.
The ratings are based on the amount of preservative used to treat the wood.
Geoff case home depot s merchant for decking and pressure treated lumber explained.
To infuse these preservatives the wood is immersed and placed in a pressure chamber.
If the lumber has been treated by the awpa check for posts that have a uc 4a or uc 4b label.
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.
For example a typical wood treatment is micronized.
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.
Cca retention levels were 25 for above ground use and 40 for ground contact.
But now retention levels vary depending on the preservative used.
Before you purchase pressure treated wood for your project you need to keep in mind what type of project you ll be working on.
Above ground treated wood must be used when lumber is less than 6 from the ground or has poor ventilation must be used for applications where wood is difficult.
Wood treated for above ground is intended for parts of your project that meets all of the following criteria.
Pressure treated lumber has been treated with chemical preservatives to help prevent rot and insect damage.
4x4x8 pressure treated 2x6x8 pressure treated southern pine pressure treated lumber ground contact pressure treated lumber 1x6x10 douglas fir 1 6 pt.
Use uc 4a or uc 4b treated lumber for the best below ground option.
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.