Best Pressure Treated Wood For Ground Contact

Pressure treated posts should be rated for ground contact awpa grade uc4a for general purpose or uc4b for heavy duty. 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. Cca retention levels were 25 for above ground use and 40 for ground contact.

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Before you purchase pressure treated wood for your project you need to keep in mind what type of project you ll be working on.

Best pressure treated wood for ground contact.

The ratings are based on the amount of preservative used to treat the wood. Store as the names suggest ground. 4x4x8 pressure treated 2x6x8 pressure treated southern pine pressure treated lumber ground contact pressure treated lumber 1x6x10 douglas fir 1 6 pt. To infuse these preservatives the wood is immersed and placed in a pressure chamber.

But now retention levels vary depending on the preservative used. Heavy duty ground contact. Wood treated for above ground is intended for parts of your project that meets all of the following criteria. 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.

If the lumber has been treated by the awpa check for posts that have a uc 4a or uc 4b label. Geoff case home depot s merchant for decking and pressure treated lumber explained. 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. Posts supporting houses garages sunrooms barns or other permanent structures in ground concrete or fresh water salt water splash.

Use uc 4a or uc 4b treated lumber for the best below ground option. 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. Pressure treated lumber has been treated with chemical preservatives to help prevent rot and insect damage. The 4a or 4b rating should be clearly marked on the lumber s end tag.

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. 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. 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.

For example a typical wood treatment is micronized.

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