In this case the architect would not provide anything.
Osha roof access requirements.
Per osha 1910 23 d 4 the side rails of through or sidestep ladders must extend 42 inches above the top of the access level or landing platform served by the ladder.
Osha requires that this distance be no greater than 3 5 feet 29 cfr 1926 502 d 16 iv but it may be less for some pfas equipment.
24 inches this extension above the access level must be at least 24 inches wide to accommodate the width of climber s body and not more than 30 inches of clearance allowing the climber to easily reach both hand rails.
While they provide great convenience to building personnel unattended roof hatches left in the open position can be dangerous.
For example ansi standard a1264 1 1995 safety requirements for workplace floor and wall openings stairs and railing systems requires guardrail protection for the exposed sides of ladderway openings in any working walking surface.
Roof hatches known sometimes as roof scuttles are designed to allow workers safe access to roof areas for hvac equipment maintenance roof renovations etc.
A stairway or ladder shall be provided at all personnel points of access where there is a break in elevation of 19 inches 48 cm or more and no ramp runway sloped embankment or personnel hoist is provided.
Through fixed ladders at their point of access egress shall have a step across distance of not less than 7 inches 18 cm nor more than 12 inches 30 cm as measured from the centerline of the steps or rungs to the nearest edge of the landing area.
Each step or rung of a fixed ladder must be able to.
How far the d ring shifts and the harness stretches when it supports the full weight of a fallen worker including the weight of tool belts and other attached equipment or tools.
1910 23 c 1 additional fall protection requirements for concrete trucks when work platforms are equipped with guardrails and toeboards.
Here s an osha booklet on stairs and ladders.
Then the roofing contractor needs to provide safe working for the roofing workers.
The building owner has provided no access to the roof none is required per building code and no fall protection on the roof.
Fixed ladders must be able to support at least two loads of 250 pounds 114 kg each concentrated between any two.
They are present on most nonresidential buildings.
A minimum perpendicular distance of 30 inches 76 cm from the centerline of the steps or rungs to the nearest object on the climbing side.
When unavoidable obstructions are encountered the minimum clearance at the obstruction may be reduced to 24 inches 61 cm provided deflector plates are installed see figure d 5 of this section.