Cracks Can Cause Hazards in Trees
Tree failure is a major cause of property damage, especially after high winds. If the wind is strong enough, even healthy trees can be uprooted or broken. But it might not take a storm or high winds to cause a cracked or rotted tree to fail under its own weight.
“Homeowners worried about trees falling and damaging property should call a qualified arborist for an on-site inspection,” advises Tchukki Andersen, BCMA, CTSP* and staff arborist with the Tree Care Industry Association (TCIA). Andersen notes that trees are genetically designed to withstand storms, but all trees can fail – and defective trees fail sooner than healthy trees.
Cracks in tree trunks can be one of the major indicators of an unstable tree. Most cracks are caused by improper closure of wounds or by the splitting of weak branch unions. They can be found in branches, stems or roots, and vary in type and severity.
Identifying Cracked Trunks
There are horizontal and vertical cracks. Horizontal cracks run across the grain of the wood and develop just before the tree fails, making them very difficult to detect. Vertical cracks run with the wood grain along the length of the tree and may appear as shear or ribbed cracks.
Shear cracks can run completely through the stem and separate it into two halves. As the tree bends and sways in the wind, one half of the stem slides over the other, elongating the crack. Eventually the enlarging crack causes the two halves of the stem to shear apart.
Ribbed cracks are created as the tree attempts to seal over a wound. Margins of the crack meet and mesh but are reopened due to tree movement or extremely cold temperatures. Thicker annual rings are created in order to stabilize the developing crack at the location of the wound. This forms the ribbed appearance over a period of many years.
These cracks put a tree at high risk of failure, and are especially dangerous when combined with other defects or with advanced decay.
How to Help A Cracked Tree: Cabling
Cabling is the installation of flexible steel strand cables in trees to reduce stress damage from high winds, the weight of ice or snow, and heavy foliage. Essentially what we are doing is strengthening weak tree branches or limbs so that they are better able to withstand severe weather and to improve their longevity.
- Direct: Direct cabling consists of a single cable between two tree parts, e.g., two limbs, two stems, or a trunk and a limb.
- Triangular: Triangular cabling consists of connecting tree parts in combination of threes. This method should be preferred, when maximum support is required.
- Box: Box cabling consists of connecting four or more tree parts in a closed series. This system should be used only when minimal direct support is needed.
- Hub and Spoke: Hub and Spoke cabling consists of a center attachment (hub) with spans (spokes) of cable radiating to three or more leaders. Hub and Spoke cabling should only be used when other installation techniques cannot be installed.
Hire a Tree Care Professional
We have qualified arborists that can determine the potential for failure by measuring the shell thickness in a few locations around the tree’s circumference, determining the width of the crack opening, and looking for the presence of any other type of defect.
credit: http://www.tcia.org/tcia/Blog
