According to 4 to 1 ratio ladder rule your ladder should be at 75 degree angle.
Set up ladder on angled roof.
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.
This tool will give you a sturdy and level base to place your ladder on slanted ground.
The 75 degree is the 4 to 1 ratio of the pitch.
How to use a roof ladder i show how to use a roof ladder with this short simple tutorial.
You will have difficulties to place and secure the ladder on the roof.
For a quick check on the angle of your ladder.
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.
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.
When lashing your ladder it s advised to secure it at ground level halfway up and finally at the top ideally with one or a few friends helping to ensure that the process is done safely.
The pivit ladder leveling boxes are lined in rubber so that you a have traction to shingled roofs and provides some protection to the shingles.
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.
If you need to use a ladder on a steep shingle roof you need a pivit ladder tool.
The main issue with the ladder and the roof comes up is the surface is sloped or steep.
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.