You can choose any pfas provided it meets the osha requirements in section 1926 502 d.
Osha roof ladder requirements.
A ladder that is less than 24 feet high does not require a fall arrest system of any sort.
Inside faces of wells on the climbing side of the ladder must extend between 27 inches 68 cm and 30 inches 76 cm from the centerline of the step or rung.
The requirements for wells for fixed ladders are as follows.
Wells must be free of projections.
Wells must completely encircle the ladder.
Here are three osha fixed ladder fall protection requirements with delayed effective dates source.
The minimum perpendicular distance from the centerline of the steps or rungs or grab bars or both to the nearest permanent object in back of the ladder is 7 inches 18 cm except for elevator pit ladders which have a minimum perpendicular distance of 4 5 inches 11 cm.
Installing fall protection personal fall arrest systems ladder safety systems cages wells on existing fixed ladders over 24 feet that do not have any fall protection by november 19 2018.
The minimum perpendicular clearance between the center line of fixed ladder rungs cleats and steps and any obstruction on the climbing side of the ladder shall be 30 inches 76 cm except as provided in paragraph a 15 of this section.
What about landing platforms.