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Monday 8am - 5pm Tuesday 8am - 5pm Wednesday 8am - 5pm Thursday 8am - 5pm Friday 8am - 5pm

J.W. Simpkin Ltd, High Holborn Road, Ripley, Derby (2026)

02/06/2026

Intumescent Coating Failures: 7 Common Causes and How to Avoid Them

Intumescent coatings are a vital part of passive fire protection.

Applied correctly, they help protect structural steel by expanding under heat and delaying the point at which the steel loses strength.

Applied badly, they can fail.

And failure is rarely down to the coating alone.

It usually starts with the process.

Poor surface preparation.
The wrong primer.
Incorrect dry film thickness.
Unsuitable site conditions.
Rushed application.
Damage from follow-on trades.
Ignoring manufacturer specifications.

Each one can compromise performance, compliance, and the wider fire strategy of the building.

The lesson is simple: intumescent coating is not a decorative finish. It is a tested fire protection system, and it has to be treated as one from specification through to final inspection.

At JW Simpkin, we deliver accredited intumescent coating services on-site and off-site, helping projects get it right first time.

Read the full article here:
https://www.jwsimpkinltd.co.uk/intumescent-coating-failures-7-common-causes-and-how-to-avoid-them/

Discover the most common reasons why intumescent coatings fail on structural steel. Learn how to prevent costly fire protection issues on your project.

29/05/2026

Here’s the Facebook post:

Fire Alarm Zoning and Fire Compartmentation: Why Coordination Matters

A fire alarm system is not just a warning device.

It is part of the wider fire strategy of a building.

Fire alarm zoning helps identify where a fire has been detected, how people should respond, and how the building’s evacuation strategy should operate. But its effectiveness depends on more than detection alone.

It must be coordinated with the building’s compartmentation.

Fire-resisting walls, floors, doors, cavity barriers, service pe*******ons, and protected routes are designed to contain fire and smoke. Alarm zones need to reflect that logic, not work against it.

When zoning and compartmentation are properly aligned, the result is clearer information, better evacuation control, and a more coherent fire strategy.

When they are poorly coordinated, confusion enters the system. And confusion is not a fire safety measure.

In our latest article, we look at fire alarm zoning, how it relates to compartmentation, and why coordination between design, installation, and documentation matters.

Read the full article here:

https://www.jwsimpkinltd.co.uk/fire-alarm-zoning-its-impact-on-fire-compartmentation

When you wander through a building, you seldom consider the quiet, unseen strategies at play, designed not merely to protect its architecture, but to protect lives. One of the most crucial, and yet most misunderstood, elements in this invisible defence system is the relationship between fire alarm z...

27/05/2026

Here’s the Facebook post:

Air Sealing: The Overlooked Detail in Modern Fire Safety

Air sealing is often spoken about in terms of energy efficiency.

But in modern construction, it also plays a vital role in fire safety.

By closing unintended gaps, cracks, joints, and service pe*******ons, air sealing helps limit the uncontrolled movement of air, smoke, toxic gases, and heat through a building.

That matters.

A building’s fire strategy depends on compartmentation. Walls, floors, fire stopping, barriers, doors, and service seals all need continuity. If air can move freely through hidden gaps, smoke can too.

Correct air sealing supports:

• Fire compartmentation
• Smoke control
• Fire-stopping performance
• Building envelope integrity
• Safer evacuation conditions
• Better compliance evidence

The issue is rarely the visible surface. It is the small missed gap, the unsealed joint, the later service pe*******on, the generic foam used where a tested fire-rated system was required.

In our latest article, we explain what air sealing is, why it matters, and how it enhances fire safety in modern construction.

Read the full article here:

https://www.jwsimpkinltd.co.uk/what-is-air-sealing-and-how-it-enhances-fire-safety-in-modern-construction

Learn how air sealing improves fire safety in buildings. Discover best practices, common mistakes, and future trends in air sealing for effective fire protection.

26/05/2026

Intumescent Paint vs Fire-Rated Boarding: Which Is Better for Steel?

Structural steel needs protection. The question is how that protection is best achieved.

Intumescent paint and fire-rated boarding both play an important role in passive fire protection, but they are not interchangeable. Each system has its place, depending on the building, the steelwork, the required fire resistance period, site conditions, finish, access, and compliance requirements.

Intumescent coatings offer a cleaner visual finish and are often suited to exposed or complex steelwork.

Fire-rated boarding provides robust encasement and can be ideal where durability, impact resistance, or concealed protection is required.

The correct choice is not about preference. It is about tested performance, specification, installation quality, and traceable evidence.

In our latest article, we look at the difference between intumescent paint and fire-rated boarding — and explain how to choose the right system for structural steel protection.

Read the full article here:

https://www.jwsimpkinltd.co.uk/intumescent-paint-vs-fire-rated-boarding-which-is-better-for-steel

Discover the pros, best practices, and compliance tips for intumescent painting in this guide comparing it to fire-rated boarding for steel protection in UK construction.

22/05/2026

Why Structural Steel Columns Need Fire Encasement

Steel may look permanent, but in a fire its strength can reduce rapidly.

That is why structural columns need properly specified fire encasement. Fire boarding helps insulate the steel, slows heat transfer, and protects loadbearing capacity for the required fire resistance period — whether 30, 60, 90 or 120 minutes.

This is not decorative work. It is part of the fire strategy.

The board system, fixings, joints, inspection process and certification trail all matter. A column is only protected when the whole tested assembly is installed correctly.

Read the full article here:
https://www.jwsimpkinltd.co.uk/why-structural-steel-columns-need-fire-encasement

Discover why structural steel columns need fire encasement, how fire boarding enhances fire safety, the best practices to follow, compliance with UK regulations, and key mistakes to avoid—plus a look at future trends in passive fire protection.

21/05/2026

Passive Fire Protection Is Never One-Size-Fits-All

A small refurbishment and a major construction project may both need Passive Fire Protection, but they rarely need the same approach.

Scale changes everything.

On larger projects, fire protection depends on sequencing, coordination, tested systems, inspection regimes, and clear evidence trails. Steel protection, fire stopping, cavity barriers, fire boarding, fire doors, and service pe*******ons all have to align with the wider fire strategy.

On smaller projects, the risks are often more concentrated. A single poorly sealed pe*******on, missing cavity barrier, or incorrectly specified fire door can compromise the compartmentation line.

The principle remains the same: the right system must suit the building, the substrate, the programme, and the required resistance period.

Passive Fire Protection is not about adding products late in the process. It is about choosing the correct tested assembly before the work begins.

Read the full article here:
https://www.jwsimpkinltd.co.uk/choosing-the-right-passive-fire-protection-for-large-vs-small-projects/

Fire safety is non-negotiable. But when it comes to construction, one size doesn’t fit all. Choosing the right passive fire protection (PFP) for a high-rise office block isn’t the same as outfitting a small industrial unit. Effective PFP is about understanding not just the threat but the context...

19/05/2026

Passive Fire Protection: The Work You’re Meant Not to Notice

A building’s fire strategy is not held together by one product, one drawing, or one final inspection.

It depends on continuity.

Compartmentation. Fire stopping. Cavity barriers. Fire doors. Protected steelwork. Service pe*******ons sealed correctly. Every junction, joint, void, riser, and hidden edge has to perform as part of a tested system.

Passive Fire Protection works by containing fire, smoke, and heat long enough for escape, intervention, and structural stability. It is not decorative. It is not optional. It is the quiet engineering that allows a building to behave properly under pressure.

When compartmentation fails, fire does not politely remain where the drawings hoped it would. It follows gaps, cavities, poor detailing, unsealed pe*******ons, and weak installation practice.

Correct specification matters.
Correct installation matters.
Correct evidence matters.

We have written a full guide explaining how Passive Fire Protection works, with a focus on compartmentation, containment, and the systems that protect buildings from unseen failure.

Read the full article here:
https://www.jwsimpkinltd.co.uk/how-passive-fire-protection-works-a-complete-guide-to-compartmentation-and-containment/

For more information or a quote on any of our Passive Fire Protection services call us on 01332 664700 or email us at [email protected]

A detailed technical essay on how passive fire protection underpins structural safety. Examines compartmentation, material performance, testing to BS 476 and EN 1366, and the accountability frameworks demanded by the Building Safety Act.

14/05/2026

Ventilated rainscreen systems depend on cavities to do their everyday job.

That is exactly what makes poor cavity barrier detailing so dangerous.

If the barrier is misaligned, loosely fixed, badly sealed at the edges, or incorrectly chosen for a ventilated façade, the cavity can remain a hidden route for fire and smoke. From the outside, the façade may look immaculate. Behind it, the fire strategy may already have been quietly compromised.

Our latest article explains the hidden risks of poor detailing in ventilated rainscreen systems, and why alignment, fixing, junctions and correct barrier selection matter so much in modern façade fire safety.

Read the full article here: https://www.jwsimpkinltd.co.uk/cavity-barriers-the-hidden-risks-of-poor-detailing-in-ventilated-rainscreen-systems/

A technical guide to the hidden risks of poor cavity barrier detailing in ventilated rainscreen systems, covering concealed fire spread, compartmentation failure, fixing, alignment, and façade compliance in UK buildings.

10/05/2026

Cavity barriers do not fail because they were missing from the drawing. They fail because the installed detail lost its integrity.

A barrier in the wrong position, loosely fixed, or left open at the edges is not much of a barrier at all. In concealed spaces, that means fire and smoke can still find the route they were meant to be denied.

Our latest article explains cavity barrier installation best practice, focusing on positioning, fixing and sealing, and why each part matters if the barrier is to protect the wider compartmentation strategy.

Because in passive fire protection, hidden work is only as good as the line it actually holds.

Read the full article here: https://www.jwsimpkinltd.co.uk/cavity-barriers-installation-best-practice-for-positioning-fixing-and-sealing-integrity/

A technical guide to cavity barrier installation best practice, covering positioning, fixing, sealing, and inspection to protect concealed spaces, support compartmentation, and maintain compliance in UK buildings.

07/05/2026

Testing and certification in passive fire protection are not paperwork exercises. They are the evidence behind whether a fire-stopping detail can be trusted.

A vague claim that something is “tested to BS 476” is not enough. The exact standard, the exact system, and the exact application all matter. The same applies to EN 1366-4 for linear joint seals. The detail only means something if the installed condition still reflects the tested arrangement.

Our latest article explains the role of BS 476, EN 1366-4, and ASFP guidance in selecting, installing and evidencing fire-stopping systems properly.

Because in fire protection, confidence without proof is just another gap in the building.

Read the full article here: https://www.jwsimpkinltd.co.uk/seo-title-testing-and-certification-bs-476-en-1366-4-and-the-role-of-asfp-guidance

A technical guide to fire-stopping testing and certification, explaining BS 476, EN 1366-4, and the role of ASFP guidance in selecting, installing, and evidencing compliant linear joint seals and related fire protection systems.

J.W. Simpkin Ltd

02/06/2026

29/05/2026

27/05/2026

26/05/2026

22/05/2026

21/05/2026

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14/05/2026

10/05/2026

07/05/2026

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Monday	8am - 5pm
Tuesday	8am - 5pm
Wednesday	8am - 5pm
Thursday	8am - 5pm
Friday	8am - 5pm