The short answer
A gutter guard is a mesh, grille, brush or lid that lets rain in and keeps leaves out. Mesh and hinged types suit houses under trees, while brush and foam are cheap to buy but clog with moss and grit. No guard removes upkeep entirely, because fine silt and seeds still settle underneath, so the gutter still needs a look every so often.
The four types you will be offered
Most guards sold for houses fall into four designs. Mesh and grille guards are rigid sheets, usually aluminium or plastic, that clip into the gutter or slide beneath the bottom row of tiles. Leaves blow or slide off the top while water drops through the holes. Brush guards are a long tube of bristles pushed into the channel, with water filtering down between the bristles. Hinged covers are solid lids with slots in them, fixed along one edge so the lid lifts for inspection. Foam inserts are blocks of porous foam that fill the channel completely.
Mesh is the usual choice where trees overhang the roof, because the leaves ride over it and the holes are small enough to keep out most nesting material. Brush and foam cost least to buy, but they sit right in the path of the water and trap whatever arrives, so they need the most attention afterwards. Hinged covers are the tidiest to look at and the easiest to check, though they cost more per metre than the others.
What a guard stops and what slips through
Guards stop leaves, twigs and the bulk of the nesting material that birds carry up to the eaves. That is where they earn their keep, because a channel packed with wet leaves is the most familiar reason for rainwater spilling over the front lip and soaking the wall below.
They do not stop fine material. Roof coverings shed grit and moss as they age, and that powder passes through any mesh and settles on the bottom of the channel as a layer of silt. Seeds land in it, and in time something green grows along the gutter. Blossom, pine needles and sycamore keys can also bridge a fine mesh and sit on top of it, where they mat together and shed water over the edge instead of into the run.
A guard also does nothing for a run that has already lost its line, so if water stands in the channel, read our page on the sagging gutter before adding anything to it.
Advantages and drawbacks side by side
- For: far fewer leaf blockages, fewer trips up a ladder on tall elevations, and less nesting debris in the channel.
- For: on a three-storey house, every avoided clean saves a scaffold tower or a long ladder, which is where much of the cost of cleaning lies.
- For: the downpipe sees less debris, so the outlet is less likely to clog.
- Against: you pay to supply and fit the guard along every run, and the price rises with the length of roofline.
- Against: cleaning a guarded gutter means taking the guard out first, and a cheap guard may lift in a gale or sag between brackets.
- Against: a mesh that clogs with moss can send water over the top in heavy rain, which is the very fault you were trying to avoid.
Set the list against your own house. A long, tall roofline under an oak weighs differently from a short run on a single-storey rear extension.
How guards are fitted at the eaves
Some designs tuck under the covering at the eaves. That means raising the edge course of tiles or slates, and on an old roof with brittle slates the ones you lift can crack. Clip-in guards avoid this because they sit within the gutter itself, and they are often the better fit on an older roof, or on one where a manufacturer's tile warranty matters to you.
Whatever the design, check the gutter before you cover it. Brackets should be firm, the joints should be dry and the run should drain evenly to its outlet. A guard laid over a failing gutter only hides the faults until they get worse. If the fascia behind is soft or close to wearing out, as described in our guide to the lifespan of uPVC fascias, replace that first, since the scaffold you need for one job can serve the other.
When a guard is not worth the money
A bungalow with no trees nearby and gutters you can reach from a short ladder rarely needs one. A tidy clean once or twice a year costs less than a guard and shows you what the channel is doing. Our gutter cleaning guide sets out the routine.
Guards make the most sense on tall elevations under overhanging branches, where reaching the gutter is awkward and leaf fall is heavy and predictable. Even then they reduce the cleaning rather than end it, and it is better to buy that reduction with open eyes. If the main trouble is a single branch, cutting it back may do more than any product.
What we check before recommending one
Before we suggest a guard, we stand under the run and look up at the brackets, the joints, the front lip and whatever hangs over the eaves. Photographs of what we see reach you with the written quote after the survey. If a tidy-up does the job, that is the advice you get, because guards cost real money and not every house repays it.
Fitted work comes with our written 10-year workmanship guarantee, and no mess is left on site. Read more on our gutters, soffits and fascias page, ring 01793 626096 or send a WhatsApp message with a photograph of the run.