Separate the fire requirements.

A riser deck and a protected shaft do not perform the same fire-safety function. Confusing the two creates weak specifications and misleading product comparisons.

RiserDeck® is an engineered GRP service-flooring and void-protection system. Its material reaction-to-fire performance must be stated separately from the fire resistance of the complete shaft construction that surrounds it.

Reaction to fire is not fire resistance

Reaction-to-fire classification describes how a product contributes to fire growth and related characteristics under defined test conditions. Fire resistance describes the ability of a building element or system to maintain functions such as integrity, insulation or loadbearing capacity for a stated period under a different test regime.

Those are different questions. A product carrying a reaction-to-fire classification is not therefore claiming a two-hour structural or compartmentation fire-resistance rating.

RiserDeck® material position

Record the required reaction-to-fire classification and obtain the classification report for the specified RiserDeck® material, including the full designation, product identity and conditions covered. Where Class B to EN 13501-1 is proposed, verify that the supplied report applies to the selected material and arrangement. Record structural duty separately: 1.5, 2.5 and 5 kN/m² are the available nominal duty inputs, with capacity confirmed against the actual span, supports, openings and project loads.

Those two statements cover different aspects of performance: reaction to fire and structural loading. Neither should be used to claim that the deck itself provides the fire resistance of the shaft enclosure.

Where two-hour shaft performance comes from

Where a project requires a two-hour protected shaft, the fire resistance is provided by the complete protected-shaft construction: the shaft-wall or gypsum build-up, doors where present, fire-stopping at penetrations and interfaces, and the other elements required by the building fire strategy.

RiserDeck® sits within that coordinated environment as access flooring and void protection. It should not be presented as the element that creates the two-hour compartmentation period.

The protected shaft is a system. The deck is one component inside it.

Why this distinction matters

High-rise specifications frequently compress several requirements into the phrase “fire-rated riser flooring”. That wording can hide important questions:

• What reaction-to-fire classification is required from the flooring material?
• What fire resistance is required from the shaft enclosure?
• How are service penetrations fire-stopped?
• Does the flooring form part of the tested compartmentation construction, or is it access flooring within it?
• What happens as services are installed and openings change?
• Who owns the interface between flooring, MEP services and fire-stopping?

Protected service shafts in current guidance

For projects in England, Approved Document B provides guidance relevant to protected shafts within the building fire-safety strategy. Select the applicable volume, edition and amendments against the project dates and transitional provisions; collated documents also include future changes. Projects elsewhere need the guidance applicable to their jurisdiction. Record the agreed fire strategy and required performance for the actual building, height and use.

Fire-stopping interfaces remain critical

A service riser changes throughout construction. Pipes, ducts, cables, containment and supports create penetrations and local interfaces. The access floor should be coordinated so installers can maintain the intended compartmentation and so future service changes do not encourage uncontrolled cutting or inaccessible fire-stopping details.

This makes early MEP coordination and controlled openings important. A deck layout that is structurally efficient but clashes with fire-stopping zones or service routes simply transfers problems downstream.

Evidence should be presented by performance category

A credible RiserDeck® technical pack should separate evidence into clear groups:

• Structural: loading, spans, supports, opening geometry and calculations.
• Reaction to fire: classification and supporting test/classification evidence for the specified material.
• Protected-shaft fire strategy: project information for walls, doors, penetrations and fire-stopping, owned by the relevant design disciplines.
• Installation: fixing, trimming, service openings and sequencing.
• Assurance: product identification, revisions, inspection and project records.

RiserDeck® should be compared on its real strengths

Assess GRP riser flooring on the performance of the specified assembly: structural weight, modular fabrication, corrosion exposure, walking-surface requirements and maintenance access. Where electrical performance is required, obtain applicable evidence including the connections and interfaces. Keep these product and design attributes separate from the fire resistance of the complete protected shaft.

That is also how competitor comparisons should be framed: compare structural performance, fire classification, installation methodology, interfaces, whole-life maintenance and evidence on a like-for-like basis.

Define. Engineer. Make. Deliver.

Define: establish the structural duty, shaft fire strategy and service requirements. Engineer: coordinate deck geometry, supports, openings and interfaces. Make: fabricate the controlled deck system. Deliver: install it without confusing product performance with the performance of the protected shaft around it.