The Tree Looks Fine. That Doesn’t Mean It Is.
Here’s the thing about trees. They hide problems well. A tree can look perfectly healthy from the curb full canopy, green leaves, upright and still be carrying internal decay, root damage, or a structural defect that makes it genuinely dangerous. Most property owners never know until something goes wrong. That’s exactly why a professional tree inspection service exists. Not for the obvious stuff. For everything that isn’t obvious. This post walks through what certified arborists actually look at during an inspection, what they’re trying to determine, and why skipping it is a risk most homeowners probably shouldn’t be taking.
It Starts Before They Even Touch the Tree
Good arborists don’t walk up and start poking at bark. The inspection starts from a distance. Tree risk assessment begins with a visual scan of the whole tree shape, lean, canopy density, and how it relates to nearby structures. Is the crown balanced or is it heavily loaded on one side? Is there a noticeable lean that wasn’t there last year? Are there gaps in the canopy that suggest dieback? That first read tells an experienced arborist a lot. Honestly more than most people would expect. Then they get closer.
The Trunk: Where a Lot Gets Hidden
The trunk is often where the real story is. And it takes a trained eye to read it properly.
- During a structural tree analysis, arborists look for cracks, cavities, bark abnormalities, and signs of internal decay. Fungal fruiting bodies, mushrooms or conks growing out of the bark are a significant red flag. They usually mean decay is already well established inside.
- Cracks in the bark, especially vertical splits or deep seams, can indicate the tree is under stress or has been compromised by frost, disease, or improper past pruning. Co-dominant stems two major trunks growing from a single point are another concern. They create weak attachment angles that fail under load. Wind, ice, heavy snow. Ottawa gets all three.
- Hazardous tree evaluation often comes down to what’s happening at the trunk level. It’s not always visible from the outside. Arborists use tools, mallets, probes, and sometimes resistograph drilling to detect hollow sections that don’t show externally.
Roots and Soil: The Part Nobody Looks At
This one gets overlooked constantly.
- A tree’s root system supports everything above it. But the roots are underground, out of sight, and people just don’t think about them. Property tree inspection done properly includes a ground-level assessment of the root zone, the area extending out from the trunk, roughly corresponding to the drip line of the canopy.
- What are they looking for? Lifted soil or pavement around the base, which can suggest root failure or root rot. Girdling roots that circle the trunk and slowly strangle it. Compacted soil from construction, foot traffic, or vehicles. Root damage from excavation nearby.
- A tree with a compromised root system is unpredictable. It can stand for years and then topple in a single storm. That’s the risk. Residential tree inspections that ignore the root zone are missing a huge piece of the picture.
Canopy and Branch Structure
Up top, arborists are scanning for deadwood, crossing branches, including bark, and signs of pest or disease pressure.
- Pest and disease tree checks at the canopy level look for discoloration, unusual leaf drop, abnormal growth patterns, and physical signs of insect activity galleries under bark, exit holes, sawdust-like frass at the base. Emerald ash borer, for instance, leaves very specific evidence. A trained eye catches it. An untrained one usually doesn’t.
- Diseased tree evaluation also covers fungal infections, bacterial cankers, and viral symptoms that show up in the leaves and stems. Some are treatable. Some aren’t. Either way, knowing early changes what’s possible.
- Crossing branches aren’t just aesthetically bad. They create wounds where bark gets worn away, opening entry points for disease. Deadwood is a falling hazard. Included bark where two stems press together and bark gets trapped between them is a structural weak point that can split without warning.
Storm Damage Assessment
After a significant weather event, storm damage tree assessment is a specific and urgent need. Trees that have been through ice storms, high winds, or heavy snow loading need evaluation even if they look okay. Internal cracks can form during storm events that aren’t visible externally. Root systems can be partially lifted and then settle back down, leaving the tree destabilized. Major limbs under load can develop stress fractures that don’t show immediately. Tree safety inspection following a storm isn’t optional for high-value or high-risk trees. The cost of missing something is too high.
What Comes After the Inspection
The inspection itself is really just the information-gathering phase. What matters is what arborists do with that information.
- Tree maintenance recommendations following an inspection might include pruning to remove deadwood or reduce load on a compromised stem, cabling or bracing to support a structurally weak co-dominant stem, treatment for a specific pest or disease, soil aeration or amendment to improve root zone conditions, or when necessary removal.
- Tree preservation services are often possible even for trees that look like lost causes. Diseased trees can sometimes be treated. Trees with root damage can recover with proper care and reduced stress. The inspection tells the arborist what’s actually salvageable and what isn’t.
- Certified arborist services mean those recommendations come backed by real training. ISA certification requires demonstrated knowledge of tree biology, risk assessment methodology, and proper care practices. That matters when decisions involve large trees near structures.
When to Book a Tree Inspection
No hard rule, but some clear triggers. After any significant storm. Before any construction or excavation project near trees, tree health assessment before ground disturbance can determine what’s at risk. When a tree shows visible symptoms unusual leaf drop, bark changes, new lean. And for mature trees, a routine arborist inspection service visit every two to three years is reasonable even with no obvious symptoms. Truth be told, most people wait too long. The inspection is cheap compared to emergency removal. Or compared to what a failed tree does to a roof.
FAQs: Tree Inspection Service
Do I need a tree inspection after a storm?
For any tree near a structure, yes. Storm events can cause internal cracking, partial root lift, and hidden branch stress that isn't visible from the outside. A storm damage tree assessment by a qualified arborist catches damage that could lead to failure during the next weather event which is often worse.
What are signs a tree may be dangerous?
A noticeable lean, cracks in the trunk, fungal growth at the base, dead branches in the upper canopy, lifted soil around the roots, or a sudden change in leaf colour or density. Any of these warrant a hazardous tree evaluation. Some dangerous trees show no obvious symptoms at all which is exactly why professional inspection exists.
How often should mature trees be inspected?
Every two to three years as a baseline, more frequently if the tree has known issues or is near a structure. Older trees accumulate deadwood, develop decay, and can have root systems affected by decades of soil changes. Regular residential tree inspections catch problems while options are still available before the only option left is removal.
