Barber-chairing risk assessment
Examine the grain direction along the face of the trunk before making the first notch. The data at longview arborist tx otmconferences shows that high tension in large diameter stems leads to unpredictable splits during a felling cut. This specific tree service work in Longview, TX requires a mechanical eye for wood fiber orientation to prevent barber-chairing. Large diameter pines often hide internal stresses that cause the buttress root area to fracture upward during the hinge compression phase.
Assessing Vertical Splitting Tendencies
Identify the presence of heavy buttress roots or an asymmetric root flare. These features often indicate uneven tension across the base of the stem. When a climber or ground crew attempts a large removal, the weight of the leaning mass pushes against the hinge. If the grain runs vertically through the hinge rather than horizontally, the wood will likely split. A split travels faster than the hinge can compress, sending the stem backward toward the climber or the bucket truck. This movement destroys the intended drop zone and compromises the safety of the rigging setup.
Mechanical Indicators of Failure
Look for deep cracks or longitudinal fissures near the base. A heavy diameter stem with existing splits is a high risk for barber-chairing. The force of the fall travels through these existing weaknesses. Even a small amount of wedge driving can trigger a split if the tension is high. The goal is to maintain a solid hinge that directs the fall forward. If the wood fibers appear to be pulling away from the center during the initial back cut, stop the cut immediately. The energy in a large stem is too great to control once the split begins.
Managing Tension and Hinge Integrity
Use heavy wedges to prevent the tree from sitting back on the saw. This keeps the hinge under compression rather than tension. In Longview, TX, many pines exhibit heavy tension due to soil compaction or leaning growth. If a notch is cut too deep or too shallow, the hinge will fail prematurely. A thin hinge provides less resistance to the splitting force. A thick hinge provides more, but if the grain is bad, even a thick hinge will not stop a barber-chair. Always keep the saw clear of the split path.
Mitigation and Tool Selection
Plan the felling cut to account for the lean. If the risk of a split is too high, traditional felling might not be the correct method. Using a rope and a lowering device for controlled descent might be safer than a free fall. Large diameter stems require heavy duty equipment. A large chipper and proper clearing around the root plate ensure that the site remains manageable after the stem hits the ground. Control the energy through precise cuts and mechanical wedges.