Gutter Guard Types Compared: Mesh vs Foam vs Brush

"Gutter guard" covers three products that work in completely different ways and suit completely different situations. Sold as one category, they get compared on price — which is how people end up with the wrong one.

Mesh

A perforated aluminium or steel sheet fixed from the gutter lip up under the first row of tiles or sheeting, forming a ramp that debris slides off.

This is the one that actually works in Sydney, provided the aperture suits your trees. It is also the most expensive and the most dependent on installation quality — a mesh fitted with the wrong fall, or without the roof edge properly re-secured, causes more problems than it solves.

• Best for: gums, jacarandas, anything narrow-leaved. Bushfire-prone areas, where ember-rated mesh is a genuine safety product, not a convenience one.
• Watch for: aperture size. A mesh sized for broad leaves will let gum needles straight through.

Foam

A triangular foam insert pushed into the gutter. Water passes through, debris sits on top.

Cheap, and easy to fit yourself, which is most of its appeal. In practice, fine debris works into the foam and stays there, the foam holds moisture against the gutter, and in a couple of Sydney seasons you have a damp sponge full of rotting leaf matter sitting in your guttering.

Getting it out again is worse than cleaning the gutter would have been. We generally recommend against it, and we remove more of it than we fit.

Brush

A long cylindrical bristle brush laid into the gutter. Large leaves rest on the bristles; water flows underneath.

Better than foam because it does not hold water the same way, and it is genuinely easy to lift out and shake off. But gum leaves and seed pods thread straight into the bristles and stay there, so under eucalypts it becomes a leaf-holding device.

• Reasonable for: broad-leaved deciduous trees, low debris loads, renters or anyone wanting something reversible.
• Poor for: the majority of Sydney streets, which have gums.

The installation detail that matters more than the product

Mesh has to be fixed so the roof edge is properly re-secured and the roof can still breathe. Done badly, it lifts the bottom row of tiles, blocks ventilation into the roof cavity, or creates a dam that pushes water back under the sheeting in heavy rain.

That last one is the failure we get called to most: a gutter guard installed with the wrong fall, causing water to back up under the roof edge during a downpour. The guard was cheap; the ceiling repair was not.

What we would fit

On a typical Sydney house under gums: quality aluminium mesh, aperture matched to the leaf, fixed so the roof edge is properly re-laid. On a bush-adjacent property: ember-rated mesh, no argument. On a low-debris inner-city terrace with no overhanging trees: quite possibly nothing at all — an annual clean may cost less than the guard.

We clean gutters, fit guard, and pull out failed guard across Greater Sydney. If we think you do not need it, we will say so.