A four to one ratio for positioning a single ladder or extension ladder means that for every four feet of wall height the bottom of the ladder must position one ft.
Set up ladder on angled roof.
This is intended for diy enthusiasts who have simple jobs to do o.
The 75 degree is the 4 to 1 ratio of the pitch.
Essentially this involves using rope cable or a ladder lashing kit to tie the rope to a secure point in order to prevent it from slipping or falling as you climb up.
Lay the ladder on the ground ensuring that the base section is facing up and place the feet against the wall of the building to prevent the ladder from sliding when you lift it up.
How to use a roof ladder i show how to use a roof ladder with this short simple tutorial.
This tool will give you a sturdy and level base to place your ladder on slanted ground.
Stand facing it with your feet touching its feet and your arms extended your palms should rest on a rung at shoulder height.
Position the ladder so that the distance from its base to the wall is one quarter of the height of the ladder at its resting point creating a 75 degree angle.
The main issue with the ladder and the roof comes up is the surface is sloped or steep.
According to 4 to 1 ratio ladder rule your ladder should be at 75 degree angle.
It s got splayed legs which give it good lateral stability and the grippers on the ends of that ladder are angled in such a way that it will grip a lower roof with up to about a 2 12 pitch very strongly without the need for a cleat as long as you are using the ladder at it s maximum steepest angle.
For a quick check on the angle of your ladder.
The steepness of the roof will not allow the ladder to stay on straight rather it will be slanted which in turn would increase your risk of falling off.
If you need to use a ladder on a steep shingle roof you need a pivit ladder tool.