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RapidSTACK™ chambers are a superior alternative to traditional class B engineering brickwork, block work or re-enforced cast insitu concrete.

Quick to install and available in a wide range of sizes RapidSTACK™ is an extremely cost effective product.

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Features & Benefits

Fast and Easy to Install

RapidSTACK™ chambers are significantly faster to install than conventional alternatives, with complete installations typically taking up to one hour. This results in reduced costs for the installer.  Only the largest sizes in the range require specialist equipment or plant in order to install the chamber.

Sectional Design

Chambers are built to required depth by adding 150mm stackable sections that are light meaning they can be manually lifted. Each access chamber possesses vertical and horizontal ribs,  resulting in a product that is strong vertically and on the sidewall. For most applications, RapidSTACK doesn’t require specialist backfills, reducing installation costs.

Variability in Size

RapidSTACK can be used to create virtually any conceivable access chamber clear opening. RapidSTACK offers a huge range of chamber dimensions thanks to the number of standard sections and the variability offered by the system.

Flexible During Installation

Chambers can be adapted to suit on-site conditions with standard tools to overbuild over existing networks, Introduce duct entries for cable entry and for top-section fine adjustment.

Flat Pack Option

RapidSTACK chambers can be sent to site in ‘flat pack’ format, allowing for flexibility in delivery and installation.

Fire Retardant

Fire retardant to BS476 Part 7 Class 2. The GRP material has been tested in accordance with ISO 4589-2 Oxygen Index Test.



Glass Reinforced Polyester Resin (GRP), is a composite material, made of a polyester resin reinforced with glass fibres.


Available Sizes

Information on sizing

RapidSTACK™ clear opening sizes are created by combining a range of standard length straight  pieces.

These straight lengths range in size from 450mm up to 2135mm and can be arranged to achieve a multitude of clear openings.



Cubis' RapidSTACK+ solution offers a strong, resilient chamber system complete with composite cover, pre-drilled duct entry knock outs and removable central beam where necessary.

For further technical information on RapidSTACK+ visit our technical library.


Load Rating

RapidSTACK™ is suitable for installation in environments rated to D400 under EN124, in accordance with Cubis’ installation guidelines.

Suitable for carriageways of roads and areas open to commercial vehicles.


Product Resources

Options & Accessories

RapidSTACK™ can be supplied with the following accessories: