As seen in the picture below featuring new ladder system we recommend a wider climbing surface to accommodate a ladder lifeline system and to make the ladder easier to climb.
Standard ladder rung height.
All other rungs on your fixed ladders will be equally spaced at 12.
1910 27 b 1 v the rungs of an individual rung ladder shall be so designed that the foot cannot slide off the end.
Osha standard for ladder rungs july 12 2010.
Therefore a variance is unnecessary.
Step ladder reach guide.
Types of ladders and their uses.
The intent of this standard is to eliminate a continuing change of the uniform distance between rungs.
A suggested design is shown in.
The highest standing level is four rungs down from the top.
This will allow enough length for proper setup the overlap of ladder sections height restrictions of the highest standing level and where appropriate the extension of the ladder above the roof line.
Even though the primary purpose of a ladder is to reach places that you cannot usually reach on your own all ladders are not the same.
The occupational safety healthy administration osha standard 1926 1053 a 6 i states that the rungs and steps of fixed metal ladders manufactured after march 15 1991 shall be corrugated knurled dimpled coated with skid resistant material or otherwise treated to minimize slipping.
This is not the case in your situation.
It would appear that you are providing uniform spacing of rungs for the user of the ladders.
Maximum reach 4 8 6 10 7 11 8 12.
Hence for reaching a height of 25 feet you need a ladder height of 28 feet.
For a maximum reach of 23 27 feet you can see the ladder height required is 28 feet.