Get Your Gutters Ready for Storm Season

The first serious storm of the season is the one that finds every weakness at once. Gutters that coped fine with light winter rain suddenly overflow, and water appears somewhere it has no business being — a ceiling stain, a damp cornice, water running down the inside of a window frame.

Almost none of it is caused by a hole in the roof. It is caused by water that had nowhere to go.

Why storms catch homes out

Your roof drainage is a system with a capacity, and Sydney storms routinely test the limit. A short, intense burst puts far more water across the roof in ten minutes than hours of steady drizzle ever will.

When a gutter is half full of compacted leaf litter, its capacity has already been cut before the rain starts. Water backs up, rises above the back edge of the gutter, and runs down inside the eaves and wall cavity instead of away from the house.

That is the failure mode that damages plaster, insulation, and cornices. And it is almost entirely preventable with an afternoon of maintenance.

Signs your last storm already left you

Before climbing anywhere, walk around the house and look for what the previous downpour recorded:

Staining on the fascia or under the eaves. Dark streaks below the gutter line mean water has been going over the back or through a joint.

Erosion or splash-back at ground level. A trench in the garden bed or mud splashed up a wall marks a spot where water has been dumping rather than draining.

Plants growing in the gutter. Not subtle, but people stop seeing it. Anything growing up there means years of accumulated sediment.

Ceiling stains that dried and stayed. An old ring on the plaster is unresolved history, not a closed case.

Water pooling near the house after rain. That may point past the gutters to the stormwater system itself — worth reading our guide on blocked stormwater drains.

Checking your gutters safely

A word on ladders first, because we would rather you read the rest of this than fall off something. Work from a stable ladder on firm level ground, have someone home with you, and stay off the roof itself — tiles crack and metal sheeting is lethal when wet. If your house is two storeys or the roof is steep, this is not a DIY job.

From the ladder, look for:

Debris load. Leaves, twigs, gum bark, and the fine black sediment underneath. That sediment holds water against the metal and is what rusts gutters out from the inside.

Sagging sections. Water should run to the outlet. Where the gutter has dropped between brackets, water sits and stagnates, and mosquitoes take an interest.

Rust, splits, and failed joints. Check corners and joins especially — that is where old gutters part company.

The back edge. Look at how the gutter meets the fascia. If the roof sheeting or tiles do not sit far enough into the gutter, heavy rain will overshoot the back edge no matter how clean it is.

Testing your downpipes

Clean gutters draining into a blocked downpipe still flood. This is the step most people skip.

Run a hose into the gutter near each outlet and watch two things: whether water drains away briskly rather than pooling, and whether it actually emerges where you expect at the bottom.

If it drains slowly, the downpipe is partly blocked — often at the first bend. If water goes in and never appears at the discharge point, the blockage is below ground in the stormwater line, which is a different and more serious problem than a leafy gutter.

Also check the discharge point itself. Downpipes should carry water clear of the house. One quietly discharging against a wall or footing does slow, expensive damage over years.

Flashings, valleys, and the bits people forget

Roof valleys — where two roof planes meet — carry a surprising volume of water and collect debris at the bottom. A blocked valley pushes water sideways under the tiles.

Flashings around chimneys, skylights, vents, and wall junctions are the other classic entry point. Look for lifted edges, perished sealant, or rusted metal.

From inside, the roof space on a dry day tells you a lot: daylight where there should not be any, damp timber, or water staining on the underside of the sarking. If you can see it, note where it is before you call — it saves diagnosis time.

When to call a roof plumber

Call rather than climb when the house is two storeys or the roof is steep, when gutters are rusted through or sagging badly enough to need re-bracketing, when a downpipe is blocked below ground level, or when water is already coming inside.

Gutters, downpipes, flashings, and the stormwater connection are licensed plumbing work in NSW — not general handyman work. A licensed roof plumber can also tell you whether the water reaching your ceiling started at the gutter or the roof, which is genuinely hard to judge from inside.

The timing matters more than the task. Every plumber in Sydney is busy the week after the first big storm. Booking maintenance before the season starts is the difference between a scheduled visit and an emergency one.

FAQs

How often should gutters be cleaned in Sydney?

Twice a year suits most homes — once before storm season in early spring, once in late autumn after leaf fall. Under gum trees, quarterly is more realistic, because bark strip and leaves build up far faster than people expect.

Why does my gutter overflow at the front in heavy rain?

Usually the gutter is blocked, the downpipe cannot clear water fast enough, or the gutter has sagged so water pools instead of running to the outlet. If it only happens in very heavy rain and the gutter is clean, the downpipe or the stormwater line below is the restriction.

Are gutter guards worth installing?

They help a lot under heavy leaf cover, and they reduce how often someone needs to be on a ladder. They do not remove the need for maintenance — fine sediment still gets through, and guards themselves need clearing. Treat them as reducing the frequency, not ending it.