Northland gets more than its share of subtropical lows. When an ex-cyclone tracks down from the north, the first places to take the hit are often the sections between Kaitāia and Whangārei, where mature pūriri, macrocarpa and gums tower over weatherboard homes built decades ago. The trees were usually there first. The question is whether they are ready for the next big blow, and whether your roof is.
Preparation is far easier in calm weather in late winter or spring than in the frantic day before a red warning. Here is a practical way to think about it.
Walk the roofline before the season turns
Start with a slow lap of the house, looking up. Make a note of every branch that sits over or within a couple of metres of the roof. For each one, consider three things: how heavy it is, how it is attached, and what it would hit if it failed.
Branches that overhang the roof by a metre or more are the obvious candidates. Less obvious are long, horizontal limbs reaching towards the house for light. These “lion’s tail” branches, bare along their length with foliage clustered at the tip, act like levers in strong wind.
Look also at what sits upwind. In much of Northland, storm winds come from the north-east or east during tropical systems. A tree on the eastern side of the house, even one that does not overhang, may be the one that ends up on the roof.
Thinning, reducing and when to leave it alone
Good storm pruning is about reducing sail area and leverage, not about making the tree look tidy. A qualified arborist might shorten long limbs back to a suitable side branch, remove deadwood and crossing branches, or reduce the overall crown modestly. Expect costs to vary widely: a light deadwood clean on a small tree might run to a few hundred dollars, while a full crown reduction on a large gum near power lines can run into the low thousands.
Avoid topping. Cutting a tree back to stubs creates a flush of weakly attached regrowth that is more likely to fail in the next storm. Heavy lifting of the lower canopy can have a similar effect, pushing all the weight to the top.
Sometimes the right answer is to leave a tree mostly as it is. A healthy, well-structured pūriri that has stood through decades of storms may be more stable than it looks. Removing trees around it can also expose it to wind it has never had to cope with.
Gutters, flashing and the roof itself
Trees and roofs fail together more often than people realise. Gutters packed with leaves overflow during the intense rain that comes with tropical lows, sending water into soffits and wall cavities. Moss and lichen growing in the shade of a big canopy hold moisture against iron or tiles and can lift edges and shorten coating life.
Before storm season, it is worth:
- Clearing gutters and downpipes, and checking that leaf guards are not clogged on top.
- Looking for loose or lifted roofing screws, cracked tiles and tired ridge capping.
- Checking flashings around chimneys and skylights, which are common leak points in driving rain.
- Photographing the roof and the trees from the ground so you have a record for insurance.
If the inspection turns up corrosion, loose fixings or storm damage from last year that was never properly fixed, it makes sense to have experienced Whangarei roofers look at it before the next system arrives, rather than relying on tarpaulins and luck when the rain is already coming in.
A simple storm-week checklist
When MetService starts talking about a deep low heading south, there is still time for a few useful steps:
- Move vehicles away from overhanging trees, especially large gums and pines.
- Secure trampolines, outdoor furniture and anything that could become airborne and strike branches or windows.
- Know where the main power switch and water toby are.
- Avoid climbing trees or ladders in rising wind. Last-minute pruning in gusty conditions causes more injuries than it prevents.
- Have a plan for where the household will sleep if the bedroom sits under the biggest tree.
After the storm, stay away from hanging branches and fallen lines, and do not walk under a damaged canopy until it has been checked.
Frequently asked questions
Do I need council permission to prune trees over my roof in Northland? Most ordinary garden trees can be pruned without consent, but some are protected in district plans, and rules differ between the Far North, Whangārei and Kaipara districts. Check with the relevant council if the tree is large, native or near a waterway.
How close to the roof should branches be? A clearance of roughly two to three metres from the roofline is a common target, though it depends on the species and how much the branches move in wind. The aim is to stop rubbing, reduce leaf build-up and limit damage if a limb fails.
Will insurance cover a tree falling on my house? Many home policies cover sudden storm damage, but cover can be reduced or declined if the tree was obviously dead or neglected. Keeping dated photos and records of maintenance can help if you ever need to make a claim.