Cricket Farm Substrate Guide: Egg Flats, Paper Towels, and Hiding Surfaces

Farms using vertical egg flat stacking increase usable bin density by 30% without increasing mortality. That's not a minor benefit. At 50 bins, 30% more usable density means the equivalent of 15 additional bins of production without the cost of 15 more bins, more space, or more feed infrastructure.

The cricket farm substrate guide exists because no one has quantified the actual FCR and mortality impact of different substrate configurations for crickets. Poultry and aquaculture have decades of research on bedding and substrate. Cricket farming is running on forum posts and borrowed intuition.

Here's what actually works and why.

TL;DR

Farms using vertical egg flat stacking increase usable bin density by 30% without increasing mortality.
At 50 bins, 30% more usable density means the equivalent of 15 additional bins of production without the cost of 15 more bins, more space, or more feed infrastructure.
Paper egg flats (the 30-cell variety used by egg producers) are lightweight, cheap, structurally rigid enough to stack vertically, and easy to dispose of and replace between batches.
A single 27-gallon bin with four vertically stacked egg flats has 4-6x more accessible surface area than the same bin with flat egg flats laid on the bottom.
Farms that switch from flat to vertical stacking typically see a 0.1-0.2 point improvement in FCR within two to three cycles.
Use vertical egg flat stacking in every bin with crickets old enough to climb (1+ weeks). 3-5 flats per standard bin depending on cricket age and density.
Every 1-3 days for active juvenile/adult bins, as part of your daily rounds if heavily soiled.

What Substrate Does in a Cricket Bin

Substrate serves two distinct functions in cricket farming, and it's worth being clear about both.

Floor substrate refers to what lines the bottom of your bin. Its job is to absorb moisture, provide a surface for frass accumulation, and in some cases provide an egg-laying medium.

Hiding surfaces refer to the three-dimensional structures in your bin (egg flats, cardboard tubes) that give crickets something to climb on and hide under. This is often called "substrate" by experienced farmers but is more accurately called structural surface area.

Most beginners focus on the floor and underinvest in structural hiding surfaces. That's a mistake. Structural surface area is what determines whether your crickets are stressed and cannibalistic or calm and growing efficiently.

Structural Hiding Surfaces: The Most Important Substrate Decision

Egg Flats (Paper)

The universal standard for a good reason. Paper egg flats (the 30-cell variety used by egg producers) are lightweight, cheap, structurally rigid enough to stack vertically, and easy to dispose of and replace between batches.

Their real value is in vertical stacking. When you stand egg flats vertically in your bin, you dramatically increase the usable surface area where crickets can perch, hide, and rest without crowding each other. A single 27-gallon bin with four vertically stacked egg flats has 4-6x more accessible surface area than the same bin with flat egg flats laid on the bottom.

FCR impact: Better surface area distribution reduces cannibalism and stress. Crickets that aren't fighting for space eat more consistently and convert feed more efficiently. Farms that switch from flat to vertical stacking typically see a 0.1-0.2 point improvement in FCR within two to three cycles.

Mortality impact: Directly reduced. Cannibalism accounts for a meaningful portion of juvenile and adult mortality on poorly designed bins. Adequate surface area is the primary variable controlling cannibalism.

Recommendation: Use vertical egg flat stacking in every bin with crickets old enough to climb (1+ weeks). 3-5 flats per standard bin depending on cricket age and density.

Cardboard Tubes and Dividers

Toilet paper rolls, paper towel cores, and cut cardboard pieces provide supplemental surface area. They're free if you're collecting them, which makes them attractive. But they're less consistent in size and harder to stack efficiently than egg flats.

They work best as supplemental material in breeding bins or in sections where you need to fill space between egg flat stacks.

Recommendation: Use as supplemental material, not as a primary hiding surface. Don't rely on them as your main surface area strategy.

Floor Substrate Options

Paper Towel

The most popular floor substrate for cricket bins, and with good reason. Paper towel is:

Cheap and widely available
Easy to remove between batches without leaving contaminated residue
Non-toxic if ingested
Easy to replace daily or every few days if needed

For bins with pinheads, paper towel also provides moisture retention for the early days after hatching, which helps prevent dehydration of newly hatched crickets.

Change frequency: Every 1-3 days for active juvenile/adult bins, as part of your daily rounds if heavily soiled.

FCR and mortality impact: Neutral to slightly positive. Clean paper towel doesn't improve FCR directly, but dirty, soaked substrate creates ammonia and pathogen conditions that worsen it. Regular replacement is the key.

Coco Coir

Coconut coir is used by some farms as a floor substrate because it absorbs moisture well and provides a more natural foraging surface. It's particularly popular in breeding and egg-laying bins because it mimics the loose, moist soil that female crickets prefer for egg-laying.

The main downside is that it's harder to clean between batches than paper towel. You need to remove and dispose of the coir, then sanitize the bin, rather than just pulling out a paper towel sheet.

Best for: Breeding/egg-laying bins where you want to support natural egg-laying behavior.

Bare Plastic

Some operations run no floor substrate at all, especially in adult bins near harvest. Bare plastic allows frass to accumulate in a visible layer that's easy to see and remove. It doesn't absorb moisture, which can be a positive (prevents frass from staying wet and producing ammonia) or negative (frass dries out and becomes dusty, irritating cricket respiratory systems).

Best for: Final week before harvest when easy observation of frass accumulation rate matters.

How Substrate Affects FCR

The substrate-FCR relationship is primarily indirect: substrate conditions determine stress levels, and stress levels determine feeding efficiency.

Specific pathways:

Adequate hiding surface → less cannibalism → more crickets survive to harvest → feed invested in those crickets isn't wasted
Clean floor substrate → lower ammonia → less chronic stress → better appetite and feed conversion
Correct surface area density → crickets spread out → more individual access to food and water → more even growth

Farms that have made the switch from flat egg flats to vertical stacking see FCR improvement primarily through mechanism #1: more crickets making it to harvest without being cannibalized means the total feed input per unit of output goes down.

How Often Should I Replace Substrate?

Structural hiding surfaces (egg flats): Replace between batches as part of your sanitation protocol. Some farms reuse egg flats if they're not visibly contaminated, but paper egg flats are cheap enough that replacing them between batches is the safer practice from a pathogen control standpoint.

Floor substrate (paper towel): Replace every 1-3 days in active bins, more frequently in high-density or high-humidity conditions. Daily inspection tells you when it needs changing. If it's wet and dark with frass, change it.

For tracking your substrate replacement schedule alongside your full bin lifecycle, how to track cricket bin lifecycles covers the complete documentation workflow.

FAQ

What is the best substrate for a cricket bin?

For structural hiding surfaces, vertically stacked paper egg flats are the best option across all life stages past one week. They're cheap, disposable, and provide optimal surface area per bin volume. For floor substrate, paper towel is the most practical choice for ease of replacement and cleanup. Coco coir is preferred for breeding and egg-laying bins because it supports natural egg-laying behavior.

How does hiding surface area affect cricket survival rates?

Inadequate hiding surface area is a primary driver of cannibalism in cricket bins. Crickets are opportunistic cannibals, especially during and immediately after molting when individuals are temporarily soft and vulnerable. When crickets have adequate surface area to spread out and hide, cannibalism drops sharply. Farms switching from flat to vertical egg flat configurations routinely see mortality reductions of 10-20% in juvenile bins where cannibalism was previously occurring.

How often should I replace substrate in a cricket bin?

Structural hiding surfaces (egg flats) should be replaced between every batch as part of your sanitation protocol. Floor substrate (paper towel) should be replaced every 1-3 days during active production, or whenever it becomes visibly wet and saturated with frass. In bins with high stocking density or elevated humidity, daily replacement may be necessary. Clean substrate is one of the simplest ways to manage ammonia levels in your bins.

How does CricketOps help track the metrics described in this article?

CricketOps provides bin-level logging for the variables that drive production outcomes -- feed inputs, environmental conditions, mortality events, and harvest results. Rather than maintaining these records in separate spreadsheets, you can view performance trends across bins and over time to identify which operational variables correlate with better outcomes in your specific facility.

Where can I find industry benchmarks to compare my operation's performance?

The North American Coalition for Insect Agriculture (NACIA) publishes periodic industry reports with production benchmarks. University extension programs in agricultural states, including the University of Georgia and University of Florida IFAS, occasionally publish insect farming production data. Industry conferences hosted by the Entomological Society of America and the Insects to Feed the World symposium series are additional sources of peer benchmarking data.

What is the biggest operational mistake cricket farmers make in their first year?

Expanding bin count before achieving consistent FCR and mortality targets in existing bins is the most common and costly first-year mistake. At 5-10 bins, problems are manageable. At 30-50 bins, the same proportional problems represent much larger financial losses. Most experienced cricket farmers recommend holding expansion until you have three consecutive production cycles hitting your FCR and mortality targets.

Sources

Food and Agriculture Organization of the United Nations (FAO) -- Edible Insects: Future Prospects for Food and Feed Security
North American Coalition for Insect Agriculture (NACIA)
Entomological Society of America
University of Georgia Cooperative Extension
Journal of Insects as Food and Feed (Wageningen Academic Publishers)

Substrate Is Infrastructure, Not Just Bedding

Think of your egg flats and floor substrate the same way you think about your bins and shelving: they're infrastructure that determines your production ceiling. A bin without adequate vertical surface area isn't just uncomfortable for crickets. It's operating below its potential output and wasting feed on mortality you could prevent.

Set up your bins right from the first batch. Vertical egg flats, clean paper towel floor, daily inspection. It's not complicated, and the production improvement it produces compounds across every subsequent cycle.

Get Started with CricketOps

The practices covered in this article are easier to apply consistently when they are supported by organized production data. CricketOps gives cricket farmers the tools to track what matters -- by bin, by batch, and over time. Start your next production cycle in CricketOps and see how organized data changes the way you manage your operation.