Building and Carpentry

Algebra

Geometry

# What should be the distance of a ladder from wall to base More than 2ft. 10 percent lenght of ladd. 20percent lenght of ladd. or 25percent lenght of ladder?

Top Answer

###### Wiki User

###### May 28, 2007 4:28AM

generally a 4:1 ratio is suggested (25%)

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Ans2:
This ladder setup will put the user at risk. The proper height to
base distance gives a 4:1 ratio, that would give the ladder a ~15
deg angle with the wall. The setup described gives a 30 deg angle
with the wall.
The base of the ladder should be brought in so that it is at 2.5
feet from the wall. If the ladder is to be used for roof access, it
should extend 3 feet past the edge so the user can use the ladder
for support as he steps onto the roof. Additionally, the ladder
should be tied to the roof at an appropriate anchor point.
To calculate the length of the ladder you apply Pythagoras: (B2
+ W2)0.5 = L
...where B is the base to wall distance, W is the height of the
wall and L is the ladder length.
Note: Raising a value to the 0.5 power is the same as taking the
square root of that value...you can't show a square root radical in
WA's text format.