USE CATEGORY

SERVICE CONDITIONS

COMMODITY

Statistical Values

Construction Waste

(%)

Mean Service Life

(yr)

Standard Deviation

(yr)

Geometric Mean of Service Life

(yr)

SD of Lognormal Service Life

(yr)

UC1

Interior construction Above Ground Dry

These uses not applicable regarding preservative usage

UC2

Interior construction

Above Ground Damp

UC3A

Exterior construction Above

Ground Coated & rapid water runoff

UC3B

Exterior construction Above Ground Uncoated or poor water run-off

Sawn Product

2.5%

10

5

2.2

0.47

Plywood

2.5%

10

5

2.2

0.47

UC4A

Ground contact or fresh water Non-critical components

Sawn Product

2.5%

15

5

2.7

0.32

Posts

0.0%

20

5

3.0

0.25

Plywood

2.5%

15

5

2.7

0.32

UC4B

Ground contact or fresh water Critical components or difficult replacement

Sawn Product

2.5%

15

5

2.7

0.32

Posts

0.0%

20

5

3.0

0.25

Plywood

2.5%

15

5

2.7

0.32

UC4C

Ground contact or fresh water Critical structural components

Sawn Product

2.5%

30

5

3.4

0.17

Round piling

0.0%

50

10

3.9

0.20

Posts

0.0%

25

5

3.2

0.20

UC 4A, B, & C

Ground Contact

Poles

0.0%

60

15

4.1

0.25

Crossties

0.0%

40

10

3.7

0.25

UC5A

Salt or brackish water and adjacent mud zone Northern waters

Sawn Product

2.5%

40

10

3.7

0.25

Piles

0.0%

40

10

3.7

0.25

UC5B

Salt or brackish water and adjacent mud zone NJ to GA, south of SanFran

Sawn Product

2.5%

40

10

3.7

0.25

Piles

0.0%

40

10

3.7

0.25

UC5C

Salt or brackish water and adjacent mud zone South of GA, Gulf Coast, Hawaii, and Puerto Rico

Sawn Product

2.5%

40

10

3.7

0.25

Piles

0.0%

40

10

3.7

0.25

UC 5A, B, & C

Marine Exposure

Plywood

2.5%

40

10

3.7

0.25