Screen Mesh Types Explained: Which Mesh Belongs in Your Retractable Screen?
For most retractable screens, black or charcoal fiberglass mesh in 18x14 or 18x16 is the right choice: it rolls tightly, recovers from creases and keeps out mosquitoes and flies. Step up to 20x20 only where no-see-ums bite, to pet mesh where claws are the threat, and to solar or privacy mesh when heat and glare matter more than airflow. This page explains what each mesh is, what the numbers mean and which ones a roll-up screen can actually live with.
Key takeaways
- Mesh count is strands per inch in each direction: 18x16 means 18 strands one way and 16 the other. Higher counts block smaller insects but cut airflow.
- Fiberglass is the default for retractable screens because it flexes and rolls without creasing; aluminum creases permanently and is a poor match for roll-up cassettes.
- 20x20 mesh stops no-see-ums but typically reduces airflow noticeably compared with 18x16, so use it only where biting midges are a real problem.
- Pet mesh and solar mesh are much thicker than standard mesh: they need a bigger housing roll diameter and usually a smaller spline.
- Charcoal or black mesh is easier to see through than gray or bright aluminum because it reflects less light back at your eye.
What do 18x16, 18x14 and 20x20 actually mean?
Mesh count is the number of strands per linear inch in the warp (lengthwise) and weft (crosswise) directions. An 18x16 mesh has 18 strands per inch one way and 16 the other, so each opening is slightly rectangular. The opening size depends on both the count and the strand diameter: thicker strands at the same count leave smaller holes and less open area.
That is why mesh count alone does not tell you airflow or visibility. Two fiberglass meshes both sold as 18x16 can differ in openness if one uses a heavier vinyl coating. For a deeper look at how open area drives airflow, light and view, see our explainer on screen mesh openness factor.
| Mesh count | Approx. opening | Stops | Airflow and view | Typical use |
|---|---|---|---|---|
| 18x14 | about 0.045 x 0.060 in (1.1 x 1.5 mm) | Mosquitoes, flies, moths, most wasps | Best of the insect meshes | Retractable doors and patio screens, large porches |
| 18x16 | about 0.045 x 0.050 in (1.1 x 1.3 mm) | Same as 18x14, slightly smaller gnats | Very good | Standard window and door screens in the US |
| 20x20 | about 0.039 in (1.0 mm) square | No-see-ums (biting midges), most gnats | Noticeably reduced | Coastal Southeast, Gulf Coast, lake and marsh sites |
| 20x30 and finer | below 0.035 x 0.025 in (0.9 x 0.6 mm) | Very small insects, some pollen | Poor; feels close and warm | Specialty pool cages and porches in heavy midge areas |
Openings are approximate, calculated as one inch divided by the count minus a typical strand diameter of around 0.010-0.013 in (0.25-0.33 mm). Mosquitoes are stopped by any standard insect mesh; the jump to 20x20 is about midges, which are small enough to pass through 18x16.
Fiberglass mesh: the retractable default
Standard "fiberglass" screen is a woven glass-fiber yarn coated with PVC (vinyl). The coating is what you see and feel. It does not rust or corrode, it does not dent, and when it creases it relaxes back flat. For a mesh that will be rolled onto a tube a thousand times a year, that last property is decisive.
Weaknesses: it tears more easily than aluminum when poked, it can be pushed out of a frame by a pet or a child, and the vinyl coating slowly chalks and embrittles in strong sun. In practice a fiberglass mesh in a retractable housing lasts longer than in a fixed frame, because the housing keeps it out of UV most of the day. Expect roughly 8-15 years in a cassette, less if the screen stays deployed in full sun all summer.
Colors are usually charcoal, black, gray and sometimes bronze or brown. Charcoal and black give the clearest view from inside because dark strands reflect less light; gray reads as a slight haze in bright sun.
Aluminum mesh: strong, but wrong for roll-up screens
Aluminum mesh comes in 18x16 and 18x14, in bright (mill), charcoal and black finishes. It is stiffer, holds a flat plane in big fixed frames, resists tearing better than fiberglass and has a crisp look many people prefer in historic window screens.
It is a poor fit for spring roll-up cassettes and pleated screens, because aluminum takes a permanent set when it creases. One accidental fold or a bar snapping back into the housing leaves a visible line forever, and repeated rolling on a small tube work-hardens the wires. Bright aluminum also oxidizes near salt air. Use it in fixed frames, porch panels and storm doors, not in roller screens. If a supplier offers aluminum for a retractable product, ask what roller diameter they use; small tubes make the problem worse.
Pet-resistant mesh
Pet mesh (Phifer PetScreen is the best-known example) is a vinyl-coated polyester with much thicker yarn and a coarser weave than insect mesh. It resists claws and paws that would shred fiberglass. The trade-offs are real:
- It is several times thicker, so a full-height door screen in pet mesh makes a much fatter roll. Many compact door cassettes simply cannot fit it.
- It weighs more, so a spring screen needs more tension to retract it reliably, which also makes the handle pull harder.
- Visibility and airflow are lower than standard mesh, especially in gray.
- It is "resistant," not proof. A large dog jumping at a mid-height panel will still pop it out of a basic track.
No-see-um mesh (20x20)
No-see-um mesh is fiberglass or polyester woven at about 20x20. It is the right answer on the Gulf Coast, coastal Carolinas and Georgia, Florida, and near marshes and lakes where biting midges come out at dusk. Elsewhere it is overkill. The finer weave cuts airflow, traps more dust and pollen on the surface (which is not the same as filtering it), and looks slightly darker.
If you only have midges for a few weeks a year, consider leaving standard 18x14 in place and using a ceiling fan on the porch: midges are weak fliers and moving air keeps many of them away.
Solar screen mesh
Solar mesh is a vinyl-coated polyester (Phifer SunTex and Twitchell Textilene are widely known families) woven tighter to block a stated percentage of solar energy, commonly sold as 80% or 90% blockage. Its job is heat and glare control; it also keeps insects out. Lower openness means less airflow, more daytime privacy and a darker, tinted view.
On large motorized patio screens and zip-track systems, the mesh is often a PVC-coated polyester shade fabric specified by openness factor (for example 3%, 5% or 10%) rather than by mesh count. The trade-offs between heat control and insect screening are covered in solar screens vs insect screens, and the screen selector walks you through the choice.
Privacy mesh
Privacy mesh is essentially high-blockage solar mesh, often 90-95%, chosen for being hard to see through from outside in daylight. The effect reverses at night: when it is darker outside than inside, people can see in through almost any mesh. If night privacy matters, you need a fabric with very low openness or a separate shade.
Mesh types compared side by side
| Mesh | Material | Count / openness | Rolls well? | Strength | Airflow | Best use |
|---|---|---|---|---|---|---|
| Standard fiberglass | Vinyl-coated glass fiber | 18x16, 18x14 | Yes | Fair | Very good | Most retractable doors, windows, patios |
| Aluminum | Aluminum wire | 18x16, 18x14 | No, creases | Good | Very good | Fixed frames, storm doors |
| Pet-resistant | Vinyl-coated polyester | Coarse, heavy yarn | Only in larger housings | Very good | Fair | Doors with dogs and cats |
| No-see-um | Fiberglass or polyester | 20x20 | Yes | Fair | Reduced | Midge-heavy coastal and lake sites |
| Solar | Vinyl-coated polyester | 80-90% blockage, or 3-10% openness | Yes, with larger roll | Good | Reduced to low | West and south patios, glare control |
| Privacy | Vinyl-coated polyester | 90-95% blockage | Yes, with larger roll | Good | Low | Street-facing patios, daytime privacy |
Why mesh thickness matters more than you think
A retractable housing is sized for the roll diameter of the mesh it shipped with. The roll diameter grows with every wrap, so a small increase in thickness becomes a large increase in roll size over a tall screen.
Thicker mesh also changes the spline. A thick mesh fills more of the channel, so you usually drop one spline size. Our spline size guide has the full table.
How to choose: a quick decision rule
- Roll-up door or window screen, no special problems: charcoal or black fiberglass, 18x14 or 18x16.
- Biting midges at dusk: 20x20 no-see-um mesh on the openings you actually sit near.
- Dogs or cats that paw the screen: pet mesh, but only if the housing is rated for it; otherwise a sturdier frame-and-track system.
- West- or south-facing patio overheating in the afternoon: solar mesh on a motorized or zip-track screen (see motorized patio screens).
- Street-facing and daytime privacy: 90-95% privacy mesh, accepting low airflow.
- Fixed frame, historic look or high abuse: aluminum.
Replacing mesh yourself? The step-by-step process is in how to rescreen a retractable screen, and wider frame or track problems are covered in retractable screen repair.
Frequently asked questions
Is 18x14 or 18x16 mesh better for a retractable screen door?
Both stop mosquitoes and houseflies. 18x14 gives slightly better airflow and view, which is why many retractable door makers use it; 18x16 blocks a few more tiny gnats. Unless you have a specific small-insect problem, either is fine.
Will no-see-um mesh keep out pollen?
Not meaningfully. Most pollen grains are far smaller than a 20x20 opening. Fine mesh catches some larger grains and dust on its surface, but it is not a filter, and it reduces airflow you might want for cooling.
Can I put solar mesh on a spring-loaded window screen?
Sometimes. Solar mesh is thicker and heavier, so the roll gets larger and the spring needs more preload. Check the housing clearance and confirm the manufacturer offers solar mesh for that model rather than assuming it will fit.
Why does my black mesh look clearer than my old gray mesh?
Gray strands reflect more daylight toward your eye, which reads as a haze over the view. Black and charcoal strands absorb that light, so your eye focuses past them. The difference is most obvious looking from a dark room into bright sun.
Does pet mesh stop cats from climbing?
It resists claw punctures much better than fiberglass, but a cat can still climb it, and its weight can pull a poorly retained mesh out of a basic track. For climbing cats, edge retention matters as much as the mesh itself.
How long does screen mesh last in a retractable housing?
Fiberglass in a cassette that is retracted most of the day commonly lasts 8-15 years. Screens left down in full sun all season wear faster, mostly through UV embrittlement of the vinyl coating and abrasion at the bottom bar.
Sources and standards consulted
- Screen mesh specification sheets (fiberglass, aluminum, polyester and PVC-coated meshes) (manufacturer documentation)
- Spline and screen frame channel specifications (manufacturer documentation)
- Retractable screen and zip screen component catalogs (manufacturer documentation)
See how we research for our sourcing and verification process.