Ten signs your gutters are blocked.
Every one of these is visible from the lawn. You do not need a ladder, you do not need to climb anything, and spotting them in October instead of February is the difference between a $240 clean and a plasterer.
What to look for, and what each one means.
Nobody inspects their gutters, so the first most people in Mackay know about it is water through a cornice in February, by which point the cheap fix is long gone. The good news is that a blocked gutter advertises itself, and every sign below can be seen from your own lawn.
1. Something is growing out of it.
The classic. Grass, a seedling, a small fig. A seed only germinates where there is enough decomposed organic matter to act as soil and enough retained moisture to keep it alive. That is not a bit of leaf. That is years of accumulation that has turned into potting mix and is now holding water permanently.
2. The gutter line has a dip in it.
Sight along the run from the corner of the yard. A gutter should be a straight line. Wet leaf is heavy, and a saturated mat plus standing water through a wet season is a load nobody bracketed for. Once it sags it holds water permanently and rusts from the inside out. A sag is the point where cleaning stops being enough and the fall has to be corrected, or the run replaced.
3. Dark staining or moss on the wall below one section.
A tiger-stripe of dirt down the fascia, or moss on the render under one specific length. That is the map of where water has been going, drawn for you over years. It always corresponds to a blocked outlet directly above.
4. Rust streaks at the joints.
Orange weeping at a joint or a stop-end means water is sitting where it should be moving. From Beaconsfield out to the beaches this accelerates hard, because salt air and standing water together will eat a gutter that would last decades inland.
5. A downpipe that stays dry while it is pouring.
The best test on the page, and it costs nothing. Next decent fall, look at each downpipe. They should all be running. One that is dry while the others gush has a blockage above it, and that water is going somewhere else - over the front, or behind the gutter into the fascia.
6. Silt in the stormwater grate.
Look in the pit at the base of the downpipe. Fine black silt is decomposed leaf that has already come through, which tells you what is sitting up in the gutter. It is frequently the actual blockage, and the one thing here you can fix yourself at ground level.
7. Mosquitoes, and this one matters here.
A gutter holding water for weeks after rain is a container breeding site, and Queensland Health advice on mosquito control has long included keeping roof gutters clear and free-draining. North Queensland is where the mosquitoes of most concern are established, so this is not a nuisance issue the way it might be in Adelaide. Mackay Regional Council runs mosquito management across public land and drains, but a gutter three metres up on private property is nobody’s job but yours, and it is the one breeding site a council program will never reach. If you are being eaten alive in your own yard and cannot work out where they are coming from, look up.
8. Wasps, birds and, eventually, rodents.
A gutter with a leaf mat is dry, sheltered and three metres off the ground. Nests in the gutter line or under the leading tile mean it has been stable enough for long enough to be attractive, which is itself the diagnosis. Fine pest mesh handles this one.
9. Damp, mould or staining inside.
Check the corners of ceilings on the weather side, the tops of window and door reveals, and the eaves lining from underneath. In our humidity a slow gutter leak becomes visible mould in weeks. If you have got this far, it has stopped being a gutter job. See the overflow page for what to do about it now.
10. Ants, and the termite question.
North Queensland carries some of the heaviest termite pressure in the country. Blocked gutters do not cause termites, but constant moisture against timber and at the base of a wall is exactly the conducive condition an AS 3660 inspection writes up. A downpipe discharging beside a wall for five years is a standing invitation. Fix the water and you have not solved termites - you have stopped advertising.
What fills a Mackay gutter.
The debris here is not the debris the product brochures were written for. Four things do most of the damage, and they behave differently:
- Poinciana. The leaflets are tiny. They go through anything coarse, they pack down into a dense mat, and they rot into the black silt you find in the stormwater pit. A poinciana over a roof is the single most reliable way to fill a gutter in this city.
- Mango. Big, waxy, slow to break down, and the fruit and stems block outlets outright. Half the yards in Andergrove have one.
- Gum and fig. Bark strips, hard leaf and constant weight. This is the leaf load that sags a gutter, and it is why treed blocks in Glenella need a stiffer mesh than an open estate roof.
- Cane trash and dust. Through the crush from roughly June to November, anywhere near blocks or a haul road. Fine, and it binds the rest of it into a mat.
Which of these you have decides both how often you need a clean and which mesh is right, because the aperture that stops gum leaf will pass poinciana leaflets straight through. Our best guard for the tropics guide covers the aperture question, and how to choose walks the whole decision.
Worked example: the same house, two timelines.
Lowset brick in Mount Pleasant, 58 lineal metres, a poinciana next door hanging over the eastern run. The owner noticed staining down the render in October and a dip in the eastern gutter.
Acting in October: clean and outlet flush, $240. The eastern run had lost its fall, so re-bracket and re-fall that 14m section, $520. Then 58m of colour-matched aluminium mesh at $50 per metre, $2,900. Total $3,660, done in the dry, on a date he chose, and the poinciana is now somebody else’s problem.
Leaving it to February: the same sag, plus water behind the fascia for a full wet, plus a stained ceiling in the back bedroom. Now it is a gutter job, plus a replacement run because the base has rusted through from the standing water, plus a plasterer, plus a painter, plus an insurance conversation about whether five years without a clean counts as maintenance - see our page on gutters and insurance claims. Same house, same tree, and comfortably three times the money.
Two visual checks a year, from the lawn: one in October before the wet, one in April after it. That is the whole discipline. Full 2026 rates are on the pricing page.
Gutter checks and cleans across the Mackay region.
Frequently asked questions.
How do I know if my gutters are blocked without getting on a ladder?
You can tell from the lawn. Look for seedlings or grass growing out of the gutter line, a visible sag or dip in a run, dark staining or moss on the wall or fascia directly under one section, rust streaks at the joints, and silt in the stormwater grate at the base of a downpipe. Then wait for the next decent fall and watch which downpipes are actually running. A downpipe that stays dry while it is pouring has a blockage above it.
Do blocked gutters breed mosquitoes in Mackay?
Yes, and in north Queensland that matters more than it does elsewhere. A blocked gutter holding standing water is a textbook container breeding site, and Queensland Health advice on mosquito control has long included keeping roof gutters clear and free-draining for exactly that reason. This part of the country is where the mosquitoes of most concern are established, so a gutter holding water for weeks after rain is not just a maintenance issue, it is a health one.
Can blocked gutters cause termites in Mackay?
Not directly, but they create the conditions. North Queensland has some of the heaviest termite pressure in the country, and constant moisture against timber and at the base of a wall is a conducive condition that gets written up in AS 3660 inspections. A downpipe discharging beside a wall or a gutter overflowing down the same corner for years is exactly the damp, sheltered spot they are looking for. Fix the water and you have not solved termites, but you have stopped inviting them.
Why is my gutter sagging in the middle?
Weight. Wet leaf is heavy, and a gutter carrying a saturated leaf mat plus standing water through a Mackay wet season is holding a load it was never bracketed for. The brackets give, the gutter drops mid-span, and once it has dropped it holds water permanently, which accelerates rust from the inside. A sag is the point at which cleaning stops being enough - the fall has to be corrected, and if the base has already gone the run needs replacing.
How often should Mackay gutters be checked?
Twice a year for a visual look from the ground: once around October before the wet arrives, and once in April after it has passed. If you have gums, figs, poincianas or mangoes over the roof, or you are near cane, the October check is the one that matters and it should be a proper clean rather than a look. Open blocks with nothing overhanging can often stretch to an eighteen-month or two-year cycle. Watch the roof, not the calendar.
Seen one of these on your place?
Send us a photo from the lawn and your suburb. Free on-site check and a fixed price.