An insect screen sits in the sun all day and gets rained on all summer. Within a few seasons the cheap ones fade, sag and tear, and the screen that was meant to keep mosquitoes and flies out has holes in it. The mesh material decides how long that takes.
This article compares the four common materials for a house, lodge, farm office, store or pack house: fibreglass, polyester, aluminium and 304 stainless steel. For each one we look at strength, how it weathers in strong sun and rain, how long it typically lasts and what it costs.
| Material | Strength | In sun | In rain and damp | Lifespan | Upfront cost |
|---|---|---|---|---|---|
| Fibreglass or plastic | StrengthLow | In sunBecomes brittle, fades, sags | In rain and dampDoes not rust, but sun and rain together age it fastest | LifespanShort | Upfront costLowest |
| Polyester (coated) | StrengthLow to medium | In sunFades and stiffens over time | In rain and dampGood, but still a polymer | LifespanMedium | Upfront costMedium |
| Aluminium | StrengthMedium | In sunMetal is fine; painted finishes chalk and fade | In rain and dampCan pit in humid, coastal or industrial air | LifespanMedium to long | Upfront costLow |
| 304 stainless steel Roff supplies this one | StrengthVery high | In sunSunlight does not degrade it | In rain and dampDoes not rust in normal inland conditions | LifespanLong | Upfront costHighest |
The pattern is clear: the cheaper the material, the harder the sun and rain hit it. Stainless steel is the one that sunlight does not break down.
Roff supplies only the stainless one, so read the comparison with that in mind. We have tried to be fair to the others.
1. Fibreglass (vinyl-coated) or plastic mesh
Best for: a sheltered, low-budget window where you are happy to replace the screen every few years.
This is the entry-level option. It is the cheapest material by some distance, light enough for a quick DIY fit, and the view through it is good. For a low-demand window that is all you need. The catch is the shortest working life of the four.
In sun and rain: this is its weak point. Strong sun breaks down the vinyl coating, and the glass fibres underneath go brittle, discolour and sag. It does not rust, but sun and rain together wear it out faster than any other option here, often within a few seasons. It also tears, frays and stretches easily, so it does poorly where pets scratch or rodents push. The low price can mislead: the mesh is cheap, but a screen you replace every few years rarely is.
Bottom line: fine for basic, sheltered, budget installations. The weakest choice the moment strength, weather or pets come into it.
2. Polyester or polypropylene (coated fabrics)
Best for: moderate-use windows and doors, or pet screens, where you want more toughness than fibreglass gives.
A step up from basic mesh: better tear resistance and less sag than fibreglass, and the vinyl-coated pet-screen versions stand up to claws reasonably well. It is lighter than metal and the view through it is acceptable, though the heavier coating trims visibility and airflow a little. In South Africa it is mostly sold as made-up pet screens rather than as mesh by the metre.
In sun and rain: more stable in sunlight than fibreglass, but it is still a polymer. Years of strong sun fade and stiffen it, and the coating that gives it its strength is the part that ages. Better than plastic, well short of metal. Where demands are heavy, with industrial dust, high insect loads or rodents, metal beats it on strength, lifespan and impact resistance.
Bottom line: a sensible middle option for moderate use, but not the one for high demands or hard weather.
3. Aluminium mesh
Best for: fixed frames in milder, drier inland spots where you want a metal screen at a lower price than stainless.
Aluminium is the strongest of the non-stainless options: more rigid than the fabric meshes, with good visibility and little sag in a fixed frame. For many homes it is a reasonable choice, with two weather caveats.
In sun and rain: the aluminium itself handles sunlight, but its painted or anodised finish chalks and fades under strong sun. In damp air, and especially humid, coastal or industrial air, aluminium oxidises and can pit. It weathers far better than plastic, but it is not the fit-and-forget metal it first appears to be. It also dents and creases under impact, from pets, children, livestock or strong wind, more easily than steel, and in high-demand settings it usually needs replacing sooner than stainless.
Bottom line: a solid mid-range option in the right climate, but faded finishes, corrosion in damp air and dents keep it a step below stainless.
4. 304 stainless steel woven mesh
Best for: anyone who wants to fit a screen once and leave it: pets, rodents, heavy insect loads, harsh sun, or years of hands-off service.
This is the benchmark the other three are measured against, and the gap is widest outdoors.
- In sun and rain: sunlight does not degrade stainless steel, because there is no polymer or coating to break down, and 304 does not rust in normal inland conditions. Of the four, it is the one that both sun and rain leave alone.
- Strength: it resists tearing and scratching, and many of our customers tell us it keeps rodents out as well as insects.
- Woven construction: a consistent aperture, reliable insect exclusion and a neat, uniform look.
- Holds its shape: it does not sag like plastic or dent as easily as aluminium.
- Low maintenance: wipes or hoses clean, with no rust or rapid wear to worry about.
A note on the coast: 304 stainless is the right grade for inland homes, lodges, farms and the bushveld, which is where most screens go. Right on the sea, in salt spray, any 304 can in time show light surface marks known as tea-staining. If you are on the coast, tell us and we will talk you through the options.
The trade-offs are real but modest: the highest upfront price of the four, a little more care to fit because it is stiffer than soft mesh, and enough weight that the frame should be decent quality.
Bottom line: the premium choice for longevity, toughness and weather. It costs more on the day, and it is the one you are least likely to buy twice.
Other things to check: mesh size, weave and fitting
- Mesh size: a finer mesh blocks smaller insects but reduces airflow slightly. 22, 24 and 26 mesh cover most needs, from flies to the smaller biting insects.
- Woven, not welded: a woven mesh gives a consistent hole shape and uniform strength across the screen. Roff’s mesh is woven stainless.
- Fitting: even a premium mesh fails if it is poorly fitted. Frame it well and tension it properly.
- Environment: harsh sun, coastal air, pets, rodents and industrial use all push you towards stronger, weather-proof materials.
- Cost over time: a cheaper mesh now can cost more over the years in repeated replacement and lost protection.
So what is right for your situation?
Match the screen to the demand, and to the weather it will face.
- Budget, sheltered, low demand: fibreglass or basic mesh.
- Moderate demand, some resilience: coated polyester, or aluminium in a milder, drier spot.
- High demand, with pets, rodents, harsh sun, a long life and minimal fuss: 304 stainless steel.
Stainless steel insect screen mesh from Roff
Roff supplies insect screen mesh in 304 stainless steel, sold by the metre in a 1.32 m width, from one metre up, in 22, 24 and 26 mesh. It costs more than fibreglass or aluminium on the day. Because it lasts so much longer, you replace it far less often, and the gap narrows with every year the screen stays up. It is strong enough to keep pets safely in and insects and rodents out.
See the 304 stainless steel insect screen mesh
Not sure which mesh size you need? Tell us your window sizes, your location and what you are keeping out, and we will recommend the right specification. Contact us using the form below.
Related reading: Fresh air in, pests out: why stainless insect screens matter beyond traditional malaria zones.
