Blocked gutters rarely announce themselves. There is no alarm and no leak on the day it happens. The gutter fills up over a couple of seasons, the water starts going somewhere it should not, and eighteen months later a painter tells you the fascia has gone soft. By then the clearing job you avoided has turned into carpentry.
These are the signs worth knowing, roughly in the order they show up, and what each one means for the house.
Water coming over the edge in heavy rain
The most obvious sign, and the easiest to miss because you have to be looking during a downpour. Stand at a window in the next decent storm and watch the gutter line. Water should run along the gutter and disappear down the pipe. If a sheet of it is spilling over the front edge, or a corner is fountaining, the gutter is full or the outlet is clogged.
Overflow at the corners is the classic. Corners are where the fall in the gutter takes debris and where it packs in hardest, so that is where the flow stops first.
Staining and tide marks down the fascia
Even after the rain stops, blocked gutters leave a record. Look up at the boards behind and below the gutter line for dark streaks, a chalky white line, or paint that has bubbled and peeled in one section while the rest is fine. That is water that has been running over the edge, down the timber and behind the gutter for months.
Paint failing in a strip under the gutter is not a paint problem. It is a gutter problem that will keep eating paint until the gutter is cleared.
Plants growing out of the gutter
If a seedling can germinate up there, the gutter holds enough soil and enough water to keep it alive, which means it has not drained properly in a long time. Wattle, grass and the occasional small gum are what we pull out of Melbourne gutters most often. Roots also work their way into joints and lift them.
Sagging between the brackets
Wet debris is heavy. A gutter full of soaked leaf litter and silt carries a load it was never designed to hold, and the gutter starts to dip between brackets or pull away from the fascia at the top edge. Sight along the gutter line from one end of the house. It should be straight, with a slight consistent fall. Waves or a section hanging low means the brackets are giving way, and that damage is not something a clean fixes. The gutter has to be refitted.
Water in the eaves or a stain on the ceiling
This is the one that costs real money. When water banks up in the gutter it can rise above the back edge and get in behind, which puts it into the eaves and along the top plate of the wall. Look for damp patches in the eave lining, a soft spot in the plaster in a corner, or a brown ring on the ceiling near an outside wall.
Where a blocked valley is involved, the water goes under the tiles and into the roof space directly, and the first sign is a ceiling stain with no obvious source. Damage at that point involves the roof, the insulation and the plaster, and the repairs run well past what a maintenance visit would have been.
Birds, wasps and mosquitoes
A gutter holding water and rotting leaf matter is a breeding site. Mosquitoes need very little standing water and clogged gutters give them a safe one. Birds nest in the debris, wasps build under the lip, and possums use a blocked gutter as a highway onto the roof. Pests are usually a symptom rather than the main problem, but they are a fair early warning that the gutter is not draining and that other problems are on the way.
A downpipe that stays dry
In real rain, every pipe on the house should be running. Walk out during a storm and check each one. A pipe that is dry while the gutter above it is overflowing has a blockage at the outlet or in the pipe itself. If water is pooling at the base of a pipe instead of getting away, the problem is underground and it needs a different fix.
Dry leaf litter before summer
The other cost is fire. Gutters packed with dry gum leaves and bark are an ember trap, and for houses anywhere near bushland that is the reason to make sure they are cleared before every summer, no matter what the calendar says about the last visit.
Questions we get asked
What happens if your gutters are blocked?
Water goes where it should not: over the edge and down the wall, into the eaves, back under the tiles, or against the foundation. Rot in the fascia, damp inside, and rust in the gutter itself all start the same way, and none of that damage is visible until it is well advanced. The gutter also rusts from the inside out under wet debris, which turns a cleaning job into a replacement.
How can I clear blocked gutters?
On a single storey house with safe footing, a stable ladder, gloves, a scoop and a bucket will do it, then a hose through the gutter to check it flows. Do not work alone, do not lean the ladder on the guttering itself, and do not do it at all on a second storey. Most ladder falls happen on jobs people expected to take five minutes.
How do you unclog a gutter you cannot reach?
That is what gutter vacuums are for. The operator works from the ground with a pole and a camera, which is the safe answer for a double storey, a steep block or a courtyard with no ladder room.
My downpipe is blocked. What can I do?
Try a hose down from the top first. If the water backs up, the blockage is solid and it needs rods or the pipe opened at a joint, which is worth having someone do properly rather than forcing something down it and cracking the pipe.
If you have spotted one of these signs, the fix is usually a straightforward clear and flush, and it is a lot cheaper than what it becomes if you leave it. Send us a couple of photos from the ground for a free quote, or see what a visit covers on our gutter cleaning Melbourne page. Call 03 8682 8767 or email [email protected].