Although both solutions offer an equal level of safety on non fragile roof surfaces one could argue that a retractable fall arrester is a more convenient solution.
Roofing rope grab.
Rope grabs allow workers to adjust the length of the lifeline and can be useful when workers are moving about the roof frequently.
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The manual rope grab is basically a metal hand trigger.
Users would have to set the length of their connection by adjusting the rope grab which is attached to the back of their harness.
The rope safe features a built in anti panic grip which function engages to arrest a fall even if the user grasps the rope grab in a way the interferes with the primary break.
This way you won t fall any further.
Users also have to deal with the excess rope.
Fasten the top of the ladder with rope or wire tied to a secure anchoring point such as a 20d nail driven into a rafter.
On uneven ground place squares of plywood under one foot to level the ladder base and then secure it with wire or rope tied to stakes.
This unique kernmantle rope grab provides the versatility of easily switching between an automatic or manual rope grab.
When you hold the rope grab down you are able to move freely up and down the rope.
Roofers who use rope grabs need to constantly take up the slack out of the line.
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Once you let go the rope grab latches to the rope and will no longer move up and down.
The anchored ropes can be as long as necessary making this form of fall protection highly versatile.
If you do fall do not grab onto the rope grab and pull the trigger.
That will keep it from sliding sideways as you step onto the roof.
The kit includes a comfort harness with shoulder padding 50 ft.