High-Strength Firestopping for Large Openings
Compound Sealing Systems Built for Strength and Safety
Our compound seal systems protect voids and grouped services in fire-rated floors and walls, forming durable barriers that prevent fire and smoke spread.
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Heavy-Duty Sealing for Complex Penetrations
Compound seals are ideal for sealing large openings with multiple services or cable trays — providing solid, fire-resistant barriers.
Load-Bearing & Durable
Our compound systems are robust enough to bear loads, resist mechanical damage, and maintain integrity over time in high-traffic areas.
Installed to Manufacturer & Building Reg Standards
All compound seal installations are documented, labelled, and delivered in line with current building regulations and fire strategy designs.
Fire-Resistant Mortar for Openings
Compound seals are used when other fire stopping methods aren’t sufficient — especially in larger or more complex penetrations. These systems use cementitious firestop mortar to create a dense barrier within floors and walls, restoring fire separation and protecting against flame and smoke ingress.
At Northern Sealants, we install compound seals where traditional wraps, collars or batts won’t work — such as in riser cupboards, service ducts, and large voids containing grouped cabling and pipework.
Strength & Safety Combined
Unlike softer firestopping materials, compound seals provide a hard-set, durable surface. Once cured, these seals are strong enough to support occasional foot traffic and resist accidental damage, making them ideal for plant rooms and service zones.
We use shuttering boards and mesh to frame the area, then pour or trowel the compound mix to create a precise seal. These installations are built to last, even under demanding site conditions.
Certified Systems with Full Traceability
Our compound sealing systems are fully tested and backed by traceable documentation. We work with approved manufacturers and follow strict installation protocols to meet fire safety standards.
Each seal is recorded and labelled on site, with photographs and specifications included in your compliance handover. This ensures your project meets all inspection requirements and long-term fire strategy needs.
Frequently Asked Questions
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What is a compound seal in fire protection?
A compound seal uses a fire-rated mortar to fill larger voids or grouped service penetrations in walls and floors, creating a durable fire barrier.
Where are compound seals typically used?
They’re ideal for riser cupboards, plant rooms, and areas where multiple services pass through a large opening that needs to be sealed.
Can compound seals support foot traffic?
Yes — once cured, compound firestop systems are hard-setting and can support occasional foot traffic, making them suitable for service zones and plant floors.
