Production Downtime & Kiln Failure – Business Interruption Explained

Introduction: why kiln failure is a business interruption problem

If your business relies on a kiln—ceramics, brickworks, refractories, glass, heat treatment, food processing, or specialist manufacturing—one breakdown can stop production instantly. Even when the repair is “only” a few days, the knock-on effects can last weeks: missed delivery slots, spoiled work-in-progress, overtime to catch up, and customers moving orders elsewhere.

That’s exactly what business interruption (BI) insurance is designed for: protecting your gross profit and ongoing costs when insured damage (or another insured trigger) forces you to slow down or stop.

This article explains how BI works in the real world, using kiln failure and production downtime as the practical lens.

What counts as a kiln failure (and why it causes extended downtime)

A “kiln failure” isn’t always a dramatic collapse. Common causes include:

• Burner or ignition system failure
• Control panel/PLC faults, sensor failure, or power supply issues
• Refractory lining damage, cracking, or hot spots
• Fan, motor, belt, or conveyor breakdown (where applicable)
• Over-temperature events and thermal shock
• Gas supply issues, regulators, valves, or safety interlocks
• Cooling system failure
• Poor calibration leading to scrap batches

The reason downtime can run long is that kilns are not plug-and-play assets. Repairs may require specialist engineers, refractory work, curing time, commissioning, and test runs. If parts are bespoke or imported, lead times can be the biggest delay.

Business interruption insurance in plain English

Business interruption insurance is not a standalone “downtime policy” in most cases. It usually sits within:

• Commercial combined insurance
• Property owners / package policies for manufacturers
• Material damage + BI programmes

In simple terms, BI covers the financial impact of an interruption, not the physical repair itself.

• Property/engineering cover pays to repair or replace the damaged kiln or related equipment (subject to terms).
• Business interruption cover helps replace lost gross profit and pays certain ongoing expenses during the interruption.

The key BI terms you need to understand

Gross profit (insurance definition)

In BI policies, “gross profit” is a policy definition, not always the same as your management accounts.

Typically it’s:

• Turnover (sales) less uninsured working expenses (costs that reduce when you stop trading)

Uninsured working expenses often include:

• Raw materials
• Packaging
• Some energy costs (depending on how your policy is set)

The goal is to insure the contribution that keeps the business alive: wages (if retained), rent, finance costs, and profit.

Indemnity period

This is the maximum time the policy will pay for BI losses after an insured event.

For kiln-dependent operations, the right indemnity period is often longer than people expect. It needs to cover:

• Repair/rebuild time
• Commissioning and quality checks
• Time to restore stock levels
• Time to win back orders and normal production rhythm

Common choices are 12, 18, 24, or 36 months.

Sum insured and underinsurance

BI is commonly insured on a “gross profit” sum insured basis. If you understate it, the insurer can apply average (a proportional reduction).

Example: if you insure £1m but should have insured £2m, you may only get 50% of a valid claim.

Waiting period / time excess

Some BI sections have a time-based excess (for example, the first 24/48/72 hours). For a kiln failure, that can matter if you can restart quickly.

Does BI cover kiln failure specifically?

It depends on the trigger.

1) BI following property damage (most common)

Many BI policies respond when there is insured damage to property at the premises.

If the kiln is damaged by an insured peril (for example, fire), BI can follow.

2) Machinery breakdown / engineering breakdown + BI extension

A kiln can fail without a fire or “standard” property peril. That’s where engineering breakdown (also called machinery breakdown) becomes important.

If you have engineering cover for the kiln and the policy includes BI (or a “machinery breakdown BI” extension), it can respond to:

• Sudden and unforeseen breakdown
• Electrical or mechanical failure

This is often the most relevant route for kiln failure downtime.

3) Utilities / services interruption

If the kiln is fine but you lose power, gas, or water, you may need a utilities BI extension. Terms vary heavily, including:

• Named suppliers
• Minimum outage duration
• Maximum indemnity

4) Prevention of access / public authority

If you can’t access the site due to an incident nearby, BI may be covered under prevention of access. This is less kiln-specific but can still stop production.

What BI typically pays for during kiln downtime

While wording varies, BI commonly covers:

• Loss of gross profit due to reduced turnover
• Increased cost of working (ICOW): extra spend to reduce the loss (for example, outsourcing production)
• Wages (if insured) to retain key staff
• Accountants’ fees for preparing claim information (sometimes included)

Increased cost of working: the most practical feature for manufacturers

ICOW can be the difference between a manageable disruption and a long-term customer loss.

Examples during kiln downtime:

• Outsourcing firing/heat treatment to another facility
• Hiring temporary equipment (where feasible)
• Paying overtime and extra shifts once the kiln is back
• Expedited shipping for parts
• Additional quality testing to validate restart batches

The policy usually requires that the extra cost is economic—i.e., it reduces the BI loss and is reasonable.

Common BI exclusions and pitfalls (especially for kiln-related claims)

This is where many claims become stressful. Common issues include:

• No engineering breakdown cover (so the trigger isn’t insured)
• Wear and tear / gradual deterioration exclusions
• Defective design or workmanship exclusions
• Maintenance and inspection conditions not met
• Uninsured damage (for example, damage that falls outside the insured perils)
• Inadequate indemnity period (claim stops before you’re back to normal)
• Stock and WIP not properly accounted for

Kilns are high-heat, high-stress assets. Insurers often want evidence of:

• Planned maintenance
• Refractory inspections
• Calibration records
• Safety checks and interlock testing

Good documentation doesn’t just help risk management—it helps prove the claim.

How a BI claim is calculated (simple example)

Imagine:

• You normally sell £400,000/month
• Your insured gross profit rate is 35%
• Kiln failure stops production for 6 weeks
• You can outsource 30% of output at extra cost

A simplified view:

1. Calculate the shortfall in turnover during the interruption.
2. Apply the gross profit rate to estimate gross profit lost.
3. Add reasonable increased cost of working (subject to policy limits and economic test).
4. Adjust for savings (costs you didn’t incur because you weren’t producing).

This is why clean management accounts, production data, and order books matter.

Kiln failure risk: what insurers look for (and what you should improve)

If you want better terms and fewer claim disputes, focus on demonstrable controls:

• Preventive maintenance plan with documented inspections
• Critical spares strategy (igniters, sensors, control boards, motors)
• Supplier support contracts and response SLAs
• Condition monitoring where appropriate
• Power quality protection (surge protection, UPS for controls)
• Fire detection and suppression appropriate to the process
• Thermal imaging and refractory monitoring
• Operator training and start-up/shutdown procedures

From a BI perspective, insurers also care about:

• Single points of failure (one kiln, one line)
• Ability to outsource or use alternative sites
• Stock buffers and lead times
• Dependency on one or two key customers

Choosing the right indemnity period for kiln-dependent production

A common mistake is choosing 12 months because it “sounds standard”. For kiln-heavy manufacturing, consider the realistic worst case:

• Specialist repair lead times
• Refractory rebuild and curing
• Control system replacement and commissioning
• Regulatory checks (where relevant)
• Requalification of product batches
• Customer re-approval and delivery schedules

If your business would take 18–24 months to fully recover turnover after a major kiln incident, that’s the indemnity period you should be discussing.

Practical steps to take immediately after a kiln failure

The first 24–72 hours can shape the whole claim.

1. Make the site safe and prevent further damage.
2. Notify your broker/insurer early and follow claims instructions.
3. Document everything: photos, engineer reports, timelines, parts ordered.
4. Separate physical damage costs from BI costs in your records.
5. Track lost orders and delayed shipments with dates and values.
6. Record mitigation actions (outsourcing, overtime, temporary kit).
7. Keep communication logs with customers and suppliers.

The aim is to prove:

• What happened
• Why it caused interruption
• What you did to reduce the loss
• What the financial impact was

When BI isn’t enough: consider additional covers

Depending on your operation, you may need:

• Engineering breakdown with adequate sums insured
• Deterioration of stock (if product is temperature-sensitive)
• Goods in transit (if outsourcing increases transport)
• Cyber cover (if kiln controls are networked and vulnerable)
• Product recall / product liability (if quality issues arise after restart)

A good programme is built around your process, not a generic checklist.

FAQs: kiln failure and business interruption

Does business interruption insurance cover a mechanical breakdown?

Often only if you have engineering/machinery breakdown cover and BI is included or extended to match. Standard BI linked to property damage may not respond to a simple breakdown.

Will BI cover the cost to repair the kiln?

Repair costs are usually under property or engineering sections, not BI. BI covers the financial loss from downtime.

What if we can still trade, but at reduced capacity?

BI can still apply. Claims often involve reduced turnover rather than a full shutdown.

Can we claim for outsourcing production?

Potentially, under increased cost of working—if it’s reasonable and reduces the overall loss.

What if the kiln failure is due to wear and tear?

Wear and tear and gradual deterioration are commonly excluded. Maintenance records and engineer findings are important.

How long should our indemnity period be?

It should reflect the time to repair/replace, recommission, rebuild stock, and regain normal turnover. For kiln-dependent manufacturing, 18–24 months is often worth considering.

Conclusion: protect cashflow, not just equipment

Kiln failure is a classic example of why manufacturers need to think beyond repairing the asset. The bigger risk is the gap between “we can’t produce” and “we’re back to normal sales”.

With the right mix of engineering breakdown and business interruption cover, plus a realistic indemnity period and strong documentation, you can protect cashflow, keep staff, and retain customers—even when production stops.

Call to action

If you rely on a kiln or heat-treatment process and want to sanity-check your business interruption cover, it’s worth reviewing:

• Whether breakdown is insured as a trigger
• Your gross profit sum insured and wage basis
• Your indemnity period
• Your ability to outsource or mitigate

If you’d like, share your sector (ceramics, brickworks, glass, heat treatment, etc.) and whether you have one kiln or multiple lines, and I’ll tailor a checklist of the most relevant BI extensions and the questions to ask your insurer.