Slackline Tree Protection: Pressure
Significant pressure around the circumference of the tree can cause the nutrient pathways in the cambium layer to become blocked or damaged. This is an issue when very thin anchor material is used, such as rope or thin webbing. The best remedy for this is to use wide slings (such as spansets) and to spread them out after placing a little tension in the slackline. This action does a great deal more to dissipate the pressure than treepro. In fact, a thin piece of carpet or felt is probably only dissipating a very negligible amount of pressure on the tree. A good width of contact on the tree to aim for is 4’’ and spacers like seen in the previous images can significantly reduce these effects.
Another topic related to pressure is the thickness of the tree. The smaller the tree, the less pressure it can usually take. This is also dependent on the type of tree you are rigging to. Use trees that are at least 12 inches in diameter. If the tree shakes noticeably under the loads created by the slackline, derig and choose another tree. If you see the bark cracking or compressing, derig and choose another tree.