Asked by: Lope De Juana
asked in category: General Last Updated: 1st January, 2020

What is the difference between #1 and #2 pressure treated wood?

What is the difference between these two grades of lumber? #2 or better is the grade supplied by lumber companies. It meets code and there is no noticable difference for deck applications. Generally #1 "only" is used when specified by a structural engineer.

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Just so, what is the difference between 1 and 2 pressure treated lumber?

Typically wood that is two or more inches thick is graded only for strength, denoted by #1, #2 and so on. And because stronger lumber has fewer and smaller knots, it's typically more attractive. So the general rule of thumb for lumber grades is this: the lower the number, the more strength and better appearance.

Similarly, what is #1 pressure treated lumber? #1 lumber grade is to be used when both strength and appearance are important. This product is #1 lumber grade meaning the boards contain small and few knots within the board. The strength of #1 grade lumber is the best you can get on the market.

Simply so, are there different grades of pressure treated lumber?

Pressure treated lumber grades. Most treated lumber does not come in different grades, the exception being plywood, which will come in both ACX and CDX grades. Virtually all treated lumber is considered for construction only – those grades do not take appearance into consideration.

What is #2 lumber?

2 Lumber. No. 2 lumber is the most common grade for framing. Lumber of this grade contains few defects, but knots are allowed of any quality as long as they are well spaced and do not exceed the size regulations.

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