TopBox Compact
Low-Profile GRP Roof Service Entry System
TopBox Compact is a bespoke, low-profile GRP roof service entry system developed by Hill Grwp Ltd for projects where building services need to pass through the roof without the requirement for a full-height roof enclosure.
Developed from the established TopBox system, TopBox Compact provides a controlled, factory-manufactured roof interface that allows multiple building services to be coordinated and brought through the roof within a single purpose-designed GRP assembly.
Rather than approaching ductwork, pipework, electrical containment and other services as a series of separate roof penetrations, TopBox Compact allows the required service routes to be considered together during the design and coordination process.
Each unit is manufactured specifically around the project requirements, with the position, quantity and size of service entry points configured to suit the agreed MEP layout and roof arrangement.
Simplifying Complex Roof Service Penetrations
Where several mechanical and electrical services need to pass through the same area of roof, coordinating multiple individual penetrations can introduce additional detailing, fabrication and interfaces between different trades.
TopBox Compact provides an alternative approach.
The system brings the required service entries together within a single coordinated GRP roof structure, allowing the roof opening and service positions to be established before manufacture.
This can help simplify coordination between the architectural, structural, roofing and MEP requirements of the project while reducing the amount of individual fabrication that needs to be resolved at roof level.
A Compact Solution for Roof Service Coordination
Not every project requires a full roof access kiosk or equipment enclosure.
Where the primary requirement is to provide a controlled transition for building services through the roof, a larger enclosure may introduce unnecessary height and volume above roof level.
TopBox Compact has been developed specifically for these applications.
Its reduced profile provides the required roof service interface while maintaining a significantly more compact structure than a conventional full-height TopBox enclosure.
It is particularly suited to projects where:
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A full-height roof enclosure is not required
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Roof space or available height is restricted
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Multiple services need to pass through the same roof area
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Service positions need to be coordinated early in the project
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A cleaner and lower-profile roof detail is preferred
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Roof penetrations need to align with a predefined MEP layout
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Off-site manufacture can help reduce roof-level fabrication and coordination
Designed Around the MEP Strategy
TopBox Compact is fully bespoke and developed around the project's mechanical and electrical requirements.
Rather than working around a predetermined internal layout, the system can be configured around the actual service arrangement required for the building.
Typical services may include:
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Ventilation ductwork
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Mechanical pipework
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Electrical containment
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Cable routes
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Control and communication services
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Other project-specific MEP services
The quantity, size and position of service entry sections can be established during design development to suit the agreed service layout and the manufacturing requirements of the system.
This allows important service positions to be determined before the unit reaches site and can reduce the requirement for later roof-level modification.
TopBox Compact - Low-Profile GRP Roof Service Entry System
What Can Be Customised?
TopBox Compact is manufactured specifically for each project rather than being supplied as a fixed-size standard unit.
Depending on the application and project requirements, the system can be developed around:
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Overall unit length and width
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Required overall profile
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Roof opening dimensions
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Number of service entry sections
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Size of individual service entry sections
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Position and spacing of service entries
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Ductwork requirements
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Pipework routes
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Electrical containment and cable routes
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Service separation requirements
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GRP finish
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External colour
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Lifting and handling requirements
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Project-specific MEP arrangements
Final configuration is subject to the requirements of the individual project and the practical structural and manufacturing requirements of the TopBox Compact system.
Off-Site Manufactured GRP Construction
TopBox Compact is manufactured off site by Hill Grwp Ltd using durable GRP construction.
Factory manufacture enables the main dimensions and agreed service positions to be established before delivery to site.
This approach can provide:
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Controlled factory fabrication
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Accurate positioning of agreed service entries
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Bespoke project-specific manufacture
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Reduced roof-level fabrication
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Improved coordination before installation
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Reduced reliance on site modifications
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More predictable installation preparation
GRP construction also provides flexibility in overall dimensions, service configurations and external appearance.
Finish and colour options can be selected to suit the requirements of the individual project.
A Coordinated Roof Interface
A key function of TopBox Compact is to provide a defined interface between the building roof and the services passing through it.
Instead of treating each service penetration as an independent detail, the system creates a common roof service zone around which the different project disciplines can coordinate their requirements.
This can help provide:
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Clearer coordination between building services and the roof layout
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Defined service positions before installation
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Reduced risk of clashes between service penetrations
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Reduced requirement for separate site-fabricated penetration details
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A more organised roof-level service arrangement
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Improved visibility of interfaces and responsibilities during project planning
The final interface between TopBox Compact, the supporting roof structure and the roofing or waterproofing system should be developed as part of the overall project design.
Discuss Your TopBox Compact Requirement
Every TopBox Compact is developed around the roof and building-services requirements of the individual project.
If you are currently coordinating ductwork, pipework, electrical containment or multiple MEP services through a roof area, send the available drawings and service information to Hill Grwp Ltd.
Our team can review the project requirements and help establish a suitable TopBox Compact configuration.
Send us your project details and we’ll take it from there.
Key Features
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Bespoke low-profile GRP roof service entry system
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Compact alternative to a full-height TopBox enclosure
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Designed around project-specific MEP layouts
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Multiple services coordinated within one roof interface
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Dedicated service entry sections incorporated as required
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Suitable for ductwork, pipework, electrical containment and associated building services
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Factory manufactured off site
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Bespoke dimensions and configurations
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Reduced roof-level profile
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Designed to reduce individual roof service interfaces
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Helps reduce roof-level fabrication and modification
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External finish and colour options available
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Lifting and handling requirements considered as part of the project configuration
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Suitable for new-build and refurbishment applications
TopBox Compact vs Standard TopBox
Both TopBox systems provide bespoke solutions for bringing building services through roof areas, but they are intended for different applications.
TopBox Compact
TopBox Compact is primarily designed for coordinated service transition through the roof while maintaining a minimal above-roof profile.
It is best suited where services need to pass through a defined roof area but there is no requirement for substantial usable space or a full-height enclosure above roof level.
Typical requirements include:
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Multiple coordinated service penetrations
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Restricted roof-level height
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Compact service arrangements
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Predefined duct, pipe and containment routes
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Reduced visual profile
TopBox Compact vs Standard TopBox
Standard TopBox - Roof Entry Systems
The standard TopBox system is better suited where the project requires a larger roof-level enclosure, additional internal space, access requirements or more substantial service and equipment accommodation.
Typical requirements may include:
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Larger concentrations of building services
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Internal enclosure space
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Maintenance access
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More extensive MEP coordination
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Equipment or containment requiring additional protected space
The difference is therefore primarily function and scale, rather than TopBox Compact simply being a smaller version of TopBox.
Hill Grwp Ltd can review the project requirements and help determine which format is more appropriate.
Case Study - TopBox
Standard TopBox Roof Entry Systems - Key Features and Details
Typical Applications
TopBox Compact can be considered for a wide range of commercial, industrial and building-services projects, including:
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Commercial developments
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Industrial facilities
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Warehousing and logistics buildings
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Manufacturing facilities
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Plant and service areas
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Mechanical ventilation systems
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Electrical distribution and containment routes
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Building-services installations
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Refurbishment projects requiring additional roof service entries
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Projects with restricted roof space
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Projects where a low roof-level profile is required
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Developments involving coordinated MEP service zones
Who Is TopBox Compact For?
TopBox Compact is primarily intended for professional construction and building-services projects where roof penetrations form part of a coordinated design.
Typical project teams may include:
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M&E contractors
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Mechanical contractors
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Electrical contractors
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Main contractors
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Roofing contractors
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MEP consultants
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Building-services designers
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Architects
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Design managers
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Project managers
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Industrial and commercial developers
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Specialist installation contractors
Early involvement can be particularly useful where several disciplines need to agree roof openings and service positions before construction reaches roof level.
Why Specify TopBox Compact?
The principal advantage of TopBox Compact is coordination.
Where multiple building services need to pass through a roof, the system allows those requirements to be considered as part of a common factory-manufactured roof interface rather than relying entirely on individual service penetration details being resolved separately on site.
TopBox Compact can help project teams:
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Reduce the number of separately formed roof interfaces
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Coordinate multiple services within a defined roof zone
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Establish important service positions before installation
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Reduce roof-level fabrication
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Reduce reliance on site modifications
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Improve dimensional control
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Reduce the potential for service clashes
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Create a cleaner and more organised roof arrangement
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Maintain a lower physical and visual roof profile
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Incorporate more of the roof service interface into an off-site manufactured assembly
Coordinated Roof Entry, Engineered as One System
See how TopBox brings together all critical roof entry elements into one fully coordinated, weatherproof solution. From electrical containment and sealed pipe entry to ducting integration, access hatches, and removable lid design, every component is engineered to work together, not added as an afterthought.
The result is a custom-built roof entry kiosk that improves installation efficiency, reduces on-site risk, and delivers consistent, long-term performance.
TopBox Compact
Multiple services. One coordinated roof interface. Minimal roof profile.
Contact us
+44 1792 899177
Frequently Asked Questions (FAQs)
What is TopBox Compact?
TopBox Compact is a bespoke, low-profile GRP roof service entry system manufactured by Hill Grwp Ltd. It provides a coordinated structure through which multiple building services can transition through the roof where a conventional full-height enclosure is not required.
What is TopBox Compact used for?
It is primarily used to coordinate building services passing through roof areas, including ductwork, mechanical pipework, cabling and electrical containment. Each arrangement is developed around the requirements of the individual project.
How does TopBox Compact differ from the standard TopBox?
TopBox Compact is focused on providing a low-profile, coordinated roof service interface.
The standard TopBox provides a larger roof-level enclosure where greater internal space, access or equipment accommodation is required. The correct option depends on the service arrangement and wider project requirements.
When should TopBox Compact be considered instead of individual roof penetrations?
TopBox Compact is particularly useful where several services need to pass through the same roof area or where service positions need to be coordinated before installation. For simple applications involving only a small number of straightforward penetrations, conventional individual roof penetration details may remain appropriate.
Can multiple services be incorporated into one TopBox Compact?
Yes. One of the main purposes of the system is to allow several building services to be coordinated within the same roof interface. The number, dimensions and positions of the service entry sections are determined by the individual project requirements.
What services can pass through TopBox Compact?
Typical applications can include: Ventilation ductwork, Mechanical pipework, Electrical containment, Cabling, Control services, Other project-specific building services. Suitability depends on the individual service arrangement and project requirements.
Is TopBox Compact available in standard sizes?
TopBox Compact is primarily a bespoke product. Overall dimensions, service entry positions and configurations are developed around the requirements of the individual project rather than relying on one fixed standard format.
What can be customised?
Depending on the project, the overall dimensions, number and position of service entries, service opening sizes, GRP finish, colour and other project-specific features can be configured to suit the required arrangement.
What information does Hill Grwp Ltd need to provide a quotation?
The most useful starting information is usually: Roof drawings, Approximate required dimensions, MEP or service layouts, Service types, Duct, pipe and containment dimensions, Required service positions, Relevant installation constraints. Where complete information is not yet available, Hill Grwp Ltd can review the initial project details and identify what additional information is required.
How is TopBox Compact integrated with the roofing system?
TopBox Compact provides the GRP roof service interface. The final connection between the unit and the project's roofing and waterproofing system should be coordinated with the roof construction and waterproofing specification for the individual development.
