Skip To Content
  4. Fortress
Fortress Chamber Render Fortress Chamber 360
360°
Fortress Chamber Insitu

STAKKAbox™ Fortress

STAKKAbox™ Fortress is a range of modular and structural preformed access chambers, suitable for use in carriageway and footway environments.

The Fortress system is moulded in HDPE and possesses excellent strength to weight properties.

Enquire about this product Specify this product
Enquire about this product

Features & Benefits

Fast and Easy to Install

STAKKAbox™ 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. No specialist equipment or plant is required in order to install the chamber and there is no need for specialist box builders.

Sectional & Twin Wall Design

Chambers are built to required depth by adding 150mm sections. Due to the twinwall design, individual sections 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. Most installations do not require specialist backfills, reducing installation costs.

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.

Smooth Outer Walls with Lip to ‘Key In’

Gaps in the outer wall will negatively impact the effectiveness of compaction around the chamber. STAKKAbox™ chambers have smooth outer walls and an outer lip which keys into the backfill.

Flat Pack Option

Fortress can be supplied in 'flat pack' format to make shipping more efficient as well as allowing flexibility in delivery and installation.

How It Works

Supplied in 150mm deep twinwall rings, the system provides contractors with a means of constructing access chambers quickly and inexpensively, whilst offering improved build quality, reduced defects and enhanced site safety performance.

Built by stacking sections to required depth, each part weighs under 25kg, making it suitable for a single person to lift under manual handling guidelines.

STAKKAbox-Fortress-Modular-Content-How-It-Works-Step-4STAKKAbox-Fortress-Modular-Content-How-It-Works-Step-1STAKKAbox-Fortress-Modular-Content-How-It-Works-Step-2STAKKAbox-Fortress-Modular-Content-How-It-Works-Step-3

Materials

HDPE

STAKKAbox™ Fortress is manufactured in nitrogen-foamed High Density Polyethylene (HDPE), of which up to 70% is recycled material.

HDPE possesses excellent strength to weight properties.

STAKKAbox-Fortress-Modular-Content-Materials

Available Sizes

Information on sizing

STAKKAbox™ Fortress chambers are formed by combining four interconnecting component parts to form each ring section. These sections are locked and secured using supplied screws. Using standard component parts allows for greater flexibility in chamber size and clear opening.

Download our product size guide for chambers in order to gain more information on available sizes.

STAKKAbox-Fortress-Modular-Content-Available-Sizes

Adaptability

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

Stakkabox Fortress Modular Content Adaptability

Load Rating

Fortress access chambers are 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.

STAKKAbox-Fortress-Modular-Content-Load-Rating

Product Resources

Options & Accessories

STAKKAbox™ Fortress can be supplied with the following accessories:

STAKKAbox-Fortress-Modular-Content-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.

Stakkabox Fortress Modular Content 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.

Stakkabox Fortress Modular Content 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.