CorrectPorch Porch Board Thermal Expansion Chart

Maximum Anticipated Temperature Rise From Time of Installation

Board

10°

12°

14°

16°

18°

20°

22°

24°

26°

28°

30°

32°

34°

36°

38°

40°

42°

44°

46°

48°

50°

Lgth (ft)

Required Gap (inches) at Butt Joints or Other Immoveable Objects

6

1/16

1/8

7

1/16

1/8

8

1/16

1/8

9

1/16

1/8

3/16

10

1/16

1/8

3/16

11

1/16

1/8

3/16

12

1/16

1/8

3/16

1/4

13

1/16

1/8

3/16

1/4

14

1/16

1/8

3/16

1/4

15

1/16

1/8

3/16

1/4

5/16

16

1/16

1/8

3/16

1/4

5/16

Notes: Always allow the greater of a 1/4" gap or the value from chart around column platforms.

For values greater than those shown in the chart please contact your CorrectPorch dealer use the site calculator.