*Once iron fences reach 60 damage the iron fence bars will turn rusty in color.
== Skill Required ==
To calculate the [[maximum slope]] you can build on, based on your [[masonry]] skill, use the following formula (submitted by ketza):
=== Skill Minimum required ===To calculate the [[maximum slope]] you can to build ona flat slope, based on your [[masonry]] skill, use the following formula is 5. (submitted by ketza12/28/12):
''Max slope = (3 *'' √''skill) + 10''
{| border="1"
!Skill !! Maximum Slope !! !!Skill !!Maximum Slope !! !!Skill !!Maximum Slope|-|1 || 13|| || 16 || 22 || || 49 || 31
|-
|2 6 || 1417|| || 19 25 || 23 25 || || 54 59 || 3233
|-
|3 8 || 1518|| || 22 29 || 24 26 || || 59 64 || 3334
|-
|4 9 || 1619|| || 25 33 || 25 27 || || 64 70 || 3435
|-
|6 12 || 1720|| || 29 36 || 26 28 || || 70 76 || 3536
|-
|8 14 || 1821|| || 33 41 || 27 29 || || 76 81 || 3637
|-
|9 16 || 1922|| || 36 45 || 28 30 || || 81 88 || 3738
|-
|12 19 || 2023|| || 41 49 || 29 31 || || 88 94 || 3839
|-
|14 22 || 2124|| || 45 54 || 30 32 || || 94 || 39
|}