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RapidSTACK™ access chambers are a superior alternative to traditional class B engineering brickwork, block work, or re-enforced cast insitu concrete. Ideal for flat-pack shipping and installations in environments that don't have large storage space before installation. The RapidSTACK™ range is quick to install and available in a wide range, making it 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.

How it's Built

RapidSTACK™ chambers are constructed by stacking 150mm deep ring sections to reach the desired depth. Each ring section is connected in the corner by pre-drilled holes using pins, nuts, and washers, interlinking one section to the other. Using the four parts to create each ring section, these ring sections can then be stacked to meet the required depth. Ideal for flat-pack shipping and installations in environments that don't have large storage space before installation.



Manufactured from Glass Reinforced Polyester Resin (GRP) material for long-lasting toughness, durability, and strength.

RapidSTACK™ chambers can achieve D400 vertical load test results with side loads comparable to those of concrete chambers.

Available Sizes

Available Sizes

RapidSTACK™ chamber systems are created by combining a range of standard lengths to create a range of clear opening sizes.

These straights range from 450mm up to 2135mm. For more information chamber size please see our product size guide.



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

Load Rating

RapidSTACK™ is suitable for meeting and exceeding installation environments rated to D400 under EN124.

Ideal for areas imposing high wheel loads, such as carriageways and open areas for commercial vehicles, whilst still enabling adaptability to varying underground utilities.


STAKKAbox™ RapidSTACK can be supplied with the following accessories:

Base Sections

Base Sections

We extrude 100% recycled Low Density Polyethylene chamber bases to suit any chamber size. These are securely fitted to the bottom ring section of a chamber to provide a clean easy finish to the floor of the chamber.

X-TRAS™ Range

X-TRAS™ Range

Using Cubis access chamber systems accessories can help save even more time. Our chamber options & accessories range allows installers to simply place, connect up tubes or ducts, backfill and walk away.

AX-S™ Covers

AX-S™ Covers

The Cubis AX-S™ range of access covers provide customers with a complete underground network access system as they are designed and manufactured from a range of materials to complement our chamber ranges.

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