Typically wood that is two or more inches thick is graded only for strength denoted by 1 2 and so on.
1 grade pressure treated lumber.
The treatment process involves placing a load of lumber in a huge cylindrical chamber called a retort with a door on one end that can be sealed airtight and then forcing waterborne chemicals into the wood under pressure.
Pressure treated lumber is ideal for outdoor construction as it has a long useful life span and is much less expensive than alternatives.
The lower the number the more strength and better appearance.
1 lumber also called premium is the higher grade with very few knots warps or other blemishes.
Use when appearance is not important.
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1 lumber is usually used for applications where appearance matters while 2 lumber is used where it will not be visible on the finished product.
2 lumber also called standard has a rougher knottier look.
Use when both strength appearance are important.
Treated wood can last more than 40 years.
Pressure treated wood is an affordable and attractive solution for decks and docks alike.
So the general rule of thumb for lumber grades is this.
Find pressure treated lumber at lowe s today.
And because stronger lumber has fewer and smaller knots it s typically more attractive.
It s easy to work with and terrific for diyers.
Boards contain small and few knots knots may be no larger than 2 one hole is permitted every 3 feet no splits larger than the width of the board stronger than 2 grade because it has fewer and smaller knots 2 grade lumber.
This lumber is pressure treated in order to protect it from termites fungal decay and rot.
Appearance grade pressure treated board 3 pack.