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Fog-collector mesh should start with a UV-protected polypropylene or polyethylene Raschel fabric, then be matched to your site’s wind, fog, drainage and maintenance demands. FogQuest specifies a Raschel weave, approximately 1 mm fibers and a 35% shade coefficient; those details matter more than buying generic plastic netting that merely looks similar. Stainless-steel and three-dimensional meshes can perform differently, but published results vary with wind speed, orientation and collector design.
This guide explains what to verify before ordering, how pore size and shade coefficient differ, which materials suit different conditions, and how to avoid treating one field study as a universal winner. Mesh choice can improve interception and drainage, but it cannot by itself guarantee a particular water yield.
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At a glance
| Name | Best for | Key spec | Checked |
|---|---|---|---|
| UV-protected polypropylene or polyethylene Raschel | Default choice for most new collectors and straightforward replacement | Raschel weave; about 1 mm fiber width; approximately 35% shade coefficient; typical pores around 1–1.3 cm | November 2026 |
| Hydrophobic-coated stainless-steel mesh | Projects evaluating higher-cost metal mesh under variable winds | Coated stainless construction; coating life and cost must be verified for the site | November 2026 |
| Three-dimensional spacer mesh (FogHa-Tin type) | Designs where thickness, orientation and drainage geometry are being engineered together | 3D spacer structure; performance changed with wind speed and orientation in the cited study | November 2026 |
What mesh specification should you start with?
For a conventional fog collector, begin by requesting UV-protected polypropylene or polyethylene Raschel mesh, not unspecified shade cloth. FogQuest’s FAQ recommends a 35% shade coefficient, Raschel weave and approximately 1 mm fiber width, and warns that other sources have presented quality and durability problems. Treat that as an established starting specification, not proof that every product carrying the same label is equivalent.
Ask the seller to state the polymer, weave, shade coefficient or open-area value, fiber dimensions, UV treatment and roll dimensions in writing. If a listing only says “fog net,” “anti-bird net” or “shade net,” you do not yet know whether its fibers, openings, drainage or outdoor stability match a fog collector.
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How do pore size, fiber width and shade coefficient affect collection?
These are related measurements, but they are not interchangeable. Pore size describes the openings between fibers; fiber width describes the strands themselves; shade coefficient describes the fraction of light blocked by the fabric and is often used as a proxy for openness. A mesh can share a nominal shade percentage with another fabric while having a different weave, strand shape or drainage path.
A fog-collection review reports typical Raschel openings of about 1 to 1.3 cm, with flat ribbon-like fibers approximately 1 mm wide and 0.1 mm thick. Those are reported typical dimensions, not a guaranteed optimum for every climate, frame or droplet distribution. Use them as a plausibility check when comparing quotations, then confirm the manufacturer’s actual technical data.
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Is a 35% shade coefficient the same as 1–1.3 cm pores?
No. The 35% figure is a shade-coefficient recommendation for the specified Raschel product, while 1–1.3 cm is a typical pore-size range reported in a review. Manufacturing tolerances, ribbon geometry and the method used to calculate shade can make two meshes with similar values behave differently. Do not substitute one measurement for the other when approving a purchase.
When a supplier provides only one of these numbers, request the missing one and ask for a drawing or data sheet. Also request air-permeability information if available; it helps reveal whether a dense-looking fabric will choke airflow even when its shade label appears acceptable.
How do Raschel, stainless-steel and three-dimensional meshes compare?
Material is only one part of the comparison. Weave, thickness, orientation, wettability, drainage and the supporting frame can change results enough that no material is a universal winner.
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| Mesh type | Strengths to consider | Risks or unknowns | Best decision rule |
|---|---|---|---|
| Polypropylene or polyethylene Raschel | Established specification; widely recognized; relatively accessible; light and easy to replace | Polymer can degrade if UV protection is poor; generic nets may not have the required weave or fiber geometry | Choose when you want the documented baseline and can verify UV protection, weave and openness |
| Coated stainless steel | Metal substrate; coated MIT-14 mesh collected more water than Raschel across the wind speeds reported in one California study | Higher cost and availability constraints; outdoor coating durability and long-term value require verification | Consider when a project can document coating quality, corrosion compatibility and lifecycle economics |
| Three-dimensional spacer mesh | Added thickness and a different drainage geometry; useful for engineered prototypes | Orientation-sensitive behavior; more complex attachment and cleaning; no general field winner established | Use only when the collector design is built around its geometry and the expected conditions are documented |
The cited California intercomparison by the U.S. Geological Survey analyzed 3,419 volumetric samples from four sites over three summer fog seasons (2014–2016). In that study, Raschel collected 160% more water than FogHa-Tin below 1 m/s, but 45% less above 5 m/s. Coated stainless-steel MIT-14 collected 3% more than Raschel below 1 m/s and 41% more at 4–5 m/s. These are conditional results from those sites and configurations, not a product guarantee.
Why do airflow and drainage matter as much as capture?
A collector must intercept droplets without stopping the fog-bearing air that brings them. After impact, water must form manageable rivulets and reach the gutter rather than being blown through, held in the mesh or redistributed onto the frame. Reviews in the International Journal of Low-Carbon Technologies and Advanced Functional Materials identify porosity, air permeability, wettability, geometry and drainage as interacting design factors.
Look at the complete water path: fiber surface, mesh plane, lower edge, collection trough and outlet. A fabric that captures droplets well but keeps a wet film can lose water to wind-driven re-entrainment or evaporation. Conversely, a very open fabric may drain quickly but present too little surface for the local droplet spectrum.
Ask suppliers whether their openness value is measured under tension and whether the mesh is intended to be installed vertically, inclined or in a layered arrangement. Installation tension can change opening shape. A folded, sagging or contaminated panel can have materially different airflow from a new sample.
How should local wind conditions influence the choice?
Do not select mesh from an average annual wind speed alone. Fog events often arrive in gusts, and the useful comparison may be between low-speed periods that dominate total fog hours and short high-speed periods that dominate structural loads. Obtain site records or a defensible design-wind range, then ask how the candidate mesh and frame behave throughout it.
The USGS figures show why this matters: Raschel’s advantage over FogHa-Tin occurred below 1 m/s, while the relationship reversed above 5 m/s. The same report found coated stainless steel ahead of Raschel in the stated low and moderate-to-high ranges. A different collector, tension, orientation or fog type could produce a different ranking.
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For exposed sites, evaluate more than collection rate. Check mesh tear strength, edge reinforcement, attachment spacing, frame deflection, corrosion compatibility and the ability to slacken or remove panels before severe weather. The mesh is part of a load path; a stronger fabric does not compensate for an under-designed frame.
Does orientation change how much water a mesh collects?
Yes. Wind direction relative to the mesh, panel angle and the orientation of a three-dimensional structure affect both droplet interception and drainage. In the USGS comparison, FogHa-Tin’s results changed with orientation, demonstrating that a 3D fabric cannot be judged independently of how it is installed.
Set the panel to face the prevailing fog-bearing flow while allowing the frame to withstand crosswinds and maintenance access. If wind direction varies substantially, consider whether a single fixed plane, a multi-panel arrangement or seasonal adjustment is practical. Document the chosen orientation so replacement panels are installed the same way.
What UV and outdoor-durability evidence should you require?
For polymer mesh, require an explicit UV-protection statement and the polymer identification. Ask whether the stated treatment applies to the finished mesh, not merely to the resin family. Request any available accelerated-weathering method, warranty terms or replacement guidance, while recognizing that a laboratory exposure rating is not the same as a site-specific service-life guarantee.
For coated stainless steel, ask what coating is used, how it is bonded, how edges are protected and how the supplier addresses abrasion, salt, dust and cleaning. A review notes that coating durability and cost-effectiveness can be concerns outdoors; do not assume a hydrophobic label means the surface will remain unchanged for the life of the collector.
Comparative field-life figures were not established in the cited material, so avoid promises such as “lasts ten years.” Plan an inspection schedule instead: check for fading, embrittlement, broken ribbons, corrosion, coating loss, enlarged openings, clogged pores and loose fasteners. Record photographs and panel dates so deterioration can be distinguished from a one-off storm event.
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How can you verify a supplier’s mesh before ordering a full roll?
- Request a technical sheet. It should identify polypropylene or polyethylene, Raschel weave (if that is the proposed baseline), fiber width and thickness, shade coefficient or open area, roll width and length, and UV treatment.
- Request a physical sample. Measure the relaxed and tensioned opening pattern with a ruler or calibrated image, and compare the ribbon width with the quoted value. A sample cannot prove field yield, but it can expose a mismatch between the listing and the delivered weave.
- Inspect the edges and joins. Look for consistent knitting, clean selvedges and a method for attaching a perimeter cord or hem. Irregular edges can concentrate loads and complicate drainage into the gutter.
- Check documentation for the intended environment. Ask about salt spray, dust, freeze–thaw exposure, cleaning agents and allowable tension. If the supplier cannot state the polymer, weave or UV treatment, treat the product as unverified.
- Confirm repeatability. Make sure replacement rolls will use the same specification and that shade coefficient, color, coating and dimensions are recorded on the purchase order.
FogQuest’s purchasing guidance is a useful search brief: “UV-protected Raschel mesh 35% shade coefficient” plus the polymer name. That phrase is not a certification, so still verify the data sheet and sample.
How much mesh do you need, and what dimensions should you specify?
Specify the finished collector area, not just a roll length. State panel height and width, number of panels, overlap or seams, top and bottom hems, side reinforcement, gutter position and the allowance needed for tensioning. A supplier should be able to quote both net mesh area and the gross roll quantity, including cutting waste.
Keep the mesh plane aligned with the gutter so water is not asked to travel across a sagging lower edge. If the design uses multiple panels, leave access for inspection and a way to remove one panel without dismantling the whole frame. Do not add extra layers simply to increase “capture” without checking pressure drop, drainage and wind loading.
What maintenance prevents mesh performance from falling?
Inspect before and after the main fog season and after unusual wind events. Remove leaves, dust, insects and salt deposits with the cleaning method approved by the supplier; aggressive brushes or solvents can damage polymer ribbons or coatings. Confirm that the lower edge remains open to the gutter and that no tie, clamp or repair patch creates a dam.
- Look for UV fading, chalking, brittleness and cracked ribbons on polymer mesh.
- Look for broken wires, red or white corrosion products and coating blisters on metal mesh.
- Check that openings have not stretched, collapsed or become blocked by sediment.
- Retension panels evenly; over-tightening can distort pores and overload the frame.
- Flush and inspect gutters, downpipes and storage connections separately from the mesh.
- Log storm dates, repairs and observed changes so replacement decisions use evidence from the site.
Water collected from fog is not automatically safe to drink. Mesh selection addresses interception and conveyance; treatment, storage hygiene and local water-quality requirements are separate engineering and public-health questions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are the most common buying mistakes?
- Buying by shade percentage alone. Shade coefficient does not identify the weave, fiber dimensions or drainage behavior.
- Assuming every shade cloth is Raschel mesh. The specified Raschel construction and approximately 1 mm fibers are part of the baseline.
- Choosing the smallest pores available. Dense mesh can restrict airflow, clog more readily and drain poorly.
- Using one study as a universal ranking. Wind speed, orientation, fog microphysics and frame geometry change outcomes.
- Ignoring the lower edge. Captured water is lost if it cannot reach the gutter cleanly.
- Accepting an unverified service-life promise. The cited research does not establish a universal outdoor lifespan.
- Leaving replacement specifications undocumented. A visually similar roll may have a different polymer, UV package or opening pattern.
Which mesh should you choose for common project situations?
For a first collector with ordinary access to replacement material: choose documented UV-protected polypropylene or polyethylene Raschel mesh near the FogQuest specification, then engineer the frame, gutter and tensioning around it.
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For a site with large wind variation and a budget for investigation: obtain comparable samples of Raschel and coated stainless steel, confirm their openness and drainage details, and evaluate them against the site’s wind distribution rather than a single headline result.
For a research or custom collector: a 3D spacer or other geometry may be justified when its orientation, drainage path and maintenance plan are deliberately designed. Treat it as a system experiment, not an automatic upgrade.
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How do the cited sources establish these recommendations?
The selection criteria are the factors repeatedly identified in the technical literature: verified material and weave, fiber and pore geometry, shade coefficient or porosity, air permeability, drainage, UV and weather resistance, wind and orientation, availability, cost and maintainability. The USGS intercomparison supplies conditional field observations; FogQuest supplies the practical Raschel specification; the cited reviews explain why geometry, wettability and drainage prevent a universal winner.
Use those criteria to create a purchase specification and to compare like with like. They are more reliable than a generic “high-yield” claim or a single number detached from the collector and climate in which it was measured.
Frequently Asked Questions
Can I use ordinary agricultural shade cloth for a fog collector?
Only if its technical data confirm the required weave, fiber geometry, openness and UV protection. A shade label by itself does not show that the fabric will intercept droplets and drain them effectively.
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The cited sources do not establish a universal color advantage. Prioritize the documented polymer, weave, UV package, openness and drainage behavior; treat color as a secondary specification unless your supplier provides evidence for the site.
How often should fog-collector mesh be replaced?
No universal service interval is established by the cited sources. Inspect condition and performance trends, then replace when UV damage, broken fibers, coating loss, distortion or irreparable drainage problems appear.
Does better mesh guarantee more water in my tank?
No. Yield also depends on fog frequency and liquid-water content, wind, collector area, orientation, frame height, drainage and storage losses. Published mesh comparisons are conditional and should not be converted into a site-wide promise.
