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Non-combustible Cavity Tray System (NCCT)

Verified by manufacturer 5 months ago

NCCT-50

Keyfix Variant:
Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

A non-combustible stainless steel single leaf lintel with combined cavity tray.

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Application

Suitable for projects requiring Document B compliance in buildings utilizing steel frame systems in the external cavity.

Description

A non-combustible cavity tray systems for projects requiring Document B compliance in buildings utilizing steel frame systems in the external cavity. Our innovative non-combustible A1 fire rated Cavity Tray system is a practical and technically superior solution to provide DPC protection over lintels, masonry supports, soffit systems and other elements in the cavity such as fire barriers.


Features and benefits:

  • Classified A1 fire rated.
  • Rigid self support.
  • Requires no sealants or mastics.
  • Integral stop ends.
  • No thermal bridge.
  • Onsite simplicity.

General information

Color

Silver

Finish

Metallic

Manufacturer guidance

Cold-rolled stainless steel.

Material

Stainless steel

Guidance for specification option:

  • Grade 304 stainless steel as standard.
  • Grade 316 stainless steel available on request.

Shape

Rectangle

Other

Length

Bespoke

Width

Bespoke

Height

Bespoke

Uniclass

Pr_25_57_21_66 Preformed cavity traysPrimary

CAWS

F30/56 Preformed cavity trays

F30/370 Preformed cavity trays

Specification data - Preformed cavity trays

Material

Austenitic stainless steel, grade 304 to BS EN 10088-2.

To fit cavity width

Minimum of 50 mm.

Height

Minimum of 94 mm.

Manufacturer guidance

  • Non – welded components = 0.5 mm thick.
  • Welded components = 0.9 mm thick.

Length (effective)

200–2500 mm.

Guidance for specification option:

Insert requirements.

Cavity cloaks

Brick trays.

Guidance for specification option:

Brick Trays are modular units which are fabricated to suit brick coursing.

Keyfix manufacture trays in half brick increments from a one Brick Tray to a 10 Brick Tray to suit any brick size or bond pattern.

Brick Trays are specified depending on the run of brickwork, taking into account the additional adjustability available when overlapping Corner Units.

Each Brick Tray is formed with an integral Stop End at each end, which prevents moisture travelling horizontally and ensures it can only escape tray via a weep. Each Brick Tray also incorporates a patented indented surface which provides a physical key within mortar, eliminating the risk of slip plane developing.

Indented surface also removes any concern surrounding rising damp and removes the need for additional DPC associated with perforated Cavity Tray systems.

Jointing piece.

Guidance for specification option:

A Jointing Piece is used to join together two abutting Brick Trays where Stop Ends abut each other, therefore allowing the NCCT system to remain continuous over a run of brickwork.

By locating Brick Trays into the Lower Clip pre-fitted to the Jointing Piece, this provides an overlap that will drain any moisture present between the abutting Stop Ends.

The perp joint between two abutting Brick Tray Stop Ends must be fully filled with mortar.

Keyfix external corner.

Guidance for specification option:

Corner Units are required on every project in order for the Non-combustible Cavity Tray System to continue around corners on a building or at a brick return reveal.

The length of the Corner Units allow for adjoining Brick Trays to overlap by ½ Brick to 1 ½ Bricks, therefore accommodating varying brick coursing or cut brick dimensions.

Keyfix provide a full range of prefabricated Corner Units to suit external and internal returns.

Bespoke corner angles are also available to order at no additional cost compared to a standard Keyfix NCCT Corner Unit.

Keyfix internal corner.

Guidance for specification option:

Corner Units are required on every project in order for the Non-combustible Cavity Tray System to continue around corners on a building or at a brick return reveal.

The length of the Corner Units allow for adjoining Brick Trays to overlap by ½ Brick to 1 ½ Bricks, therefore accommodating varying brick coursing or cut brick dimensions.

Keyfix provide a full range of prefabricated Corner Units to suit external and internal returns.

Bespoke corner angles are also available to order at no additional cost compared to a standard Keyfix NCCT Corner Unit.

Keyfix LH reveal corner.

Guidance for specification option:

Corner Units are required on every project in order for the Non-combustible Cavity Tray System to continue around corners on a building or at a brick return reveal.

The length of the Corner Units allow for adjoining Brick Trays to overlap by ½ Brick to 1 ½ Bricks, therefore accommodating varying brick coursing or cut brick dimensions.

Keyfix provide a full range of prefabricated Corner Units to suit external and internal returns.

Bespoke corner angles are also available to order at no additional cost compared to a standard Keyfix NCCT Corner Unit.

Keyfix RH reveal corner.

Guidance for specification option:

Corner Units are required on every project in order for the Non-combustible Cavity Tray System to continue around corners on a building or at a brick return reveal.

The length of the Corner Units allow for adjoining Brick Trays to overlap by ½ Brick to 1 ½ Bricks, therefore accommodating varying brick coursing or cut brick dimensions.

Keyfix provide a full range of prefabricated Corner Units to suit external and internal returns.

Bespoke corner angles are also available to order at no additional cost compared to a standard Keyfix NCCT Corner Unit.

Ribbed overlapping joints.

Guidance for specification option:

The Keyfix NCCT system is the only Cavity Tray of its kind which does not rely on tapes, sealants or mastics and instead creates a mechanical, dry seal joint referred to as Ribbed Overlapping Joints.

This mechanical, dry seal joint is created when ribs formed by downward pressed channels within the tray profile are completely overlapped by a Brick Tray.

The use of tapes, sealants or mastics increases the possibility of onsite installation errors outside of the manufacturers control and therefore the warranty.

By eliminating the use of tapes, sealants or mastics at joints, the Ribbed Overlapping Joint gives unrivalled joint integrity lifespan and removes all installation errors associated with onsite conditions such as dust, moisture or low temperatures, which prevents “wet” joints performing, resulting in water ingress.

Pier units.

Guidance for specification option:

Pier Units are fabricated bespoke depending on project requirements so one single Non-combustible Cavity Tray piece can be used in congested locations. Such as an 890 mm pier between two openings.

Similarly to a Brick Tray, each Pier unit is finished with integral Stop Ends which ensures moisture is captured on top of tray and cannot escape unless via an intended weep.

Pier Units also include an indented surface, therefore eliminating the risk of slip plane developing in the outer skin of masonry. Indented surface also removes any concern surrounding rising damp and removes the need for additional DPC associated with perforated Cavity Tray systems.

Pier Units are available to suit from 440 to 1790 mm between two openings.

Stepped capping piece.

Guidance for specification option:

Stepped Capping Piece’s are utilized when a Jointing Piece cannot be used because of a step in the panel of brickwork and negates the requirement for a Corner Unit to suit step in brickwork.

By placing a Stepped Capping Piece over the top of the abutting Brick Tray Stop Ends, this allows the NCCT system to remain continuous over a run of brickwork while also accommodating the step in brickwork.

It is critical that the perp joint between abutting Brick Tray Stop Ends must be fully filled between and on top of Stop Ends before placing Stepped Capping Piece over the top of Stop Ends. The maximum allowable step in brickwork which can be accommodated is 50 mm.

Accessories

Keyfix Non-combustible Weep (NCW).

Reaction to fire

A1.

Guidance for specification option:

Keyfix NCCT manufactured from stainless steel have an A1 fire classification defined by Commission Decision 96/603/EC.

AdjustmentRange

Stop ends facilitate perp joint width adjustability of +/- 3 mm between 7–13 mm if required.

Manufacturer guidance

Lateral adjustment.

Weight

Up to maximum of 4 kg per component.

Guidance for specification option:

Keyfix NCCT component weight data sheet available at request from manufacturer.

Water drainage/reservoir layer

External and internal corner units sustained a flow of 0.45 L per minute per linear meter for a period of one hour without leaking.

Manufacturer guidance

BBA Test Method. Test Report: T164436.

LoadBearingCapacity

Keyfix NCCT will not adversely affect ability of the wall to sustain and transmit compressive load.

ShearStrength

Tested in accordance with BS EN 1052-4:2000.

Flexural strength

Tested in accordance with DD 86-1:1983.

Durability

Under normal service conditions, lifespan is 125+ years.

Standard

PD 6697, BS EN 1996, BS 8215, BS EN 10028-7, BS EN ISO 9001, BS EN ISO 14001, BS EN 1052-4, DD86-1.

Types

As per manufacturers recommendations.

Overall size

To suit span, loading, wall and finish type.

Sustainability data

Contains Red List materials

No

Country of material origin

United Kingdom

Country of product manufacture

United Kingdom

Embodied carbon

A1-A3 (production stage) as defined in BS EN 15804

5.27 kg CO₂ eq/kg

Recyclability

100

Manufacturer guidance

This product is recyclable.

Recycled content

As defined in clause 7.8 of BS EN ISO 14021

90 %

Guidance for specification option:

Up to 90%.

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

BBA Certificate

Literature

Keyfix Non-combustible Cavity Tray Installation Guide

Keyfix Non-combustible Cavity Tray Installation Guide

Keyfix Non-combustible Cavity Tray Lintel Installation Guide

Keyfix Non-combustible Cavity Tray Lintel Installation Guide

Keyfix Product Guide

Keyfix Product Guide

Keyfix Specification Guide

Keyfix Specification Guide

Non-combustible Cavity Tray Lintel Datasheet

Non-combustible Cavity Tray Lintel Datasheet

Keyfix Non-combustible Cavity Tray Datasheet

Keyfix Non-combustible Cavity Tray Datasheet

Non-combustible Retaining Disc Datasheet

Non-combustible Retaining Disc Datasheet

Case studies

Chobham Manor

Chobham Manor

Verdo-Kew Bridge

Verdo-Kew Bridge