J.W. Simpkin Ltd

03/09/2026

Cavity barriers around windows and openings are easy to overlook once the façade is finished, but the detail around heads, jambs and sills is critical to controlling fire and smoke spread.

Our latest article looks at continuity around apertures, coordination with brackets and membranes, installation tolerances, inspection before concealment, and the risk of later trades disturbing completed work.

Read the full article here:
https://www.jwsimpkinltd.co.uk/cavity-barriers-around-windows-and-openings-controlling-fire-spread-in-facades/

Cavity barriers around windows and openings are critical to façade fire performance. Learn why heads, jambs, sills, interfaces, continuity and correct installation must be carefully detailed and inspected.

02/09/2026

Service pe*******ons are unavoidable in modern buildings, but every pipe, cable, duct and conduit that passes through a fire-resisting wall or floor has the potential to weaken compartmentation.

This article looks at why fire stopping around service pe*******ons needs tested systems, correct detailing, competent installation and clear evidence to maintain the integrity of the compartment.

Read the full article here:https://www.jwsimpkinltd.co.uk/fire-stopping-service-pe*******ons-maintaining-compartment-integrity-in-modern-construction/

26/08/2026

Fire alarms do more than detect and warn. In many buildings, they also release fire doors, unlock exits, trigger phased evacuation and interact with smoke control.

Those actions only work properly when the passive fire protection supports them.

Our latest article looks at the connection between alarm zoning, compartment lines, door release, cause-and-effect logic and evacuation strategy, and why active and passive fire protection need to be coordinated as one system.

Read the full article here:

Fire alarms do more than detect fire. Learn how zoning, compartment lines, phased evacuation, door release and cause-and-effect logic must coordinate with passive fire protection.

24/08/2026

Protecting structural steel in an occupied building demands more than simply applying an intumescent coating.

Access, surface preparation, curing conditions, dry film thickness, protection of surrounding finishes and the practical reality of working around people all have to be controlled without lowering the fire protection standard.

Our latest article looks at how on-site structural steel protection can be planned and delivered properly in buildings that remain in use.

Read the full article here:

On-site intumescent protection in occupied buildings requires careful access, surface preparation, curing control and protection of surrounding finishes. Learn how structural steel can be protected without compromising safety, quality or building use.

21/08/2026

Passive fire protection can be installed correctly, inspected and signed off, then compromised by the next trade through the area.

A new cable through an existing seal, a drilled compartment wall, a moved cavity barrier or an altered fire door can all weaken the original fire strategy.

Our latest article looks at the hidden fire risk of uncoordinated trades, and why change control, reinspection and final verification are essential if passive fire protection is to remain compliant throughout the build.

Read the full article here:

Follow-on trades can damage fire stopping, cavity barriers, compartment walls and fire doors after installation. Learn why trade coordination, change control, inspection and reinspection are essential to passive fire protection.

20/08/2026

Small works can still create serious fire protection weaknesses.

A new cable, minor pipe alteration, adjusted fire door or small access opening can all affect compartmentation if the work is not properly planned, installed and recorded.

Our latest article looks at why small works still need the same fire protection discipline as larger projects, including tested systems, inspection, reinstatement and clear evidence.

Read the full article here:
https://www.jwsimpkinltd.co.uk/why-small-works-still-need-full-fire-protection-discipline/

12/08/2026

Passive fire protection can be installed correctly, inspected and signed off, then compromised by the next trade through the area.

A new cable through an existing seal, a drilled compartment wall, a moved cavity barrier or an adjusted fire door can all weaken the original fire strategy.

Our latest article looks at the hidden fire risk of uncoordinated trades, and why change control, reinspection and final verification matter just as much as the first installation.

Read the full article here:

Follow-on trades can damage fire stopping, cavity barriers, compartment walls and fire doors after installation. Learn why trade coordination, change control, inspection and reinspection are essential to passive fire protection.

06/08/2026

Protecting structural steel in an occupied building requires far more than applying an intumescent coating.

Access may be restricted, existing paint systems may be unknown, and work has to be managed around people, active services and finished interiors. Surface preparation, curing conditions and dry film thickness still need to meet the tested specification, regardless of the building remaining in use.

Our latest article examines how on-site intumescent work can be planned, applied and inspected without compromising fire performance or surrounding areas.

Read the full article here:

On-site intumescent protection in occupied buildings requires careful access, surface preparation, curing control and protection of surrounding finishes. Learn how structural steel can be protected without compromising safety, quality or building use.

29/07/2026

Fire boarding can look simple on a drawing, but the installed system depends on far more than board thickness alone.

Fixings, joints, corners, access, steel profiles, surrounding construction and finish tolerances all affect whether the encasement can be built in line with the tested detail.

Our latest article explains what architects need to consider when specifying fire boarding, from early coordination through to inspection before concealment.

Read the full article here:

Fire boarding performance depends on board thickness, fixings, joints, corners, access and tested encasement details. Learn what architects should consider when specifying fire protection boarding.

23/07/2026

Fire Protection in Riser Shafts: The Vertical Route Nobody Should Ignore

Riser shafts carry pipes, cables, ducts and controls through several floors of a building. If compartmentation is incomplete, pe*******ons are poorly sealed or access doors fail, those same shafts can provide a concealed route for smoke, heat and flame.

Our latest article looks at why riser fire protection depends on continuous compartmentation, tested pe*******on systems, planned access, proper sequencing and clear inspection records.

Read the full article here:

Riser shafts can allow smoke and flame to travel rapidly between floors. Learn how compartmentation, service pe*******ons, access, inspection and clear records protect these critical vertical routes.