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ISB® Building System

For Contractors

Build the Structure Differently.

ISB® PHC-250 combines lightweight permanent formwork elements, project-specific reinforcement and concrete into an engineered reinforced concrete structural system. The difference is not only in the material — it is in how the structure is planned, assembled and completed on site.

Manual wall-element handling No heavy wall lifting Planned element use Monolithic reinforced concrete
See How ISB® Is Built →
ISB building system wall assembly on a construction site showing lightweight wall elements and reinforced concrete construction preparation
Assembly Lightweight Elements
Structure Steel + Concrete
Result Monolithic System
ISB® construction stage Wall assembly
01 · Structural Logic

Lightweight to assemble. Reinforced concrete when complete.

PHC elements establish the geometry and remain in place as permanent formwork. The structural design adds vertical, horizontal and connection reinforcement. Concrete is then placed within the system so reinforcement and concrete work together as the engineered reinforced concrete structure.

ISB building system structural 3D model showing the coordinated wall and floor structure
Structural System
ISB PHC-250 wall elements with steel reinforcement positioned between permanent formwork elements
Construction Detail
Reinforcement is integrated within the wall system before concrete placement.
01

PHC Elements

Establish geometry and permanent formwork.

02

Reinforcement

Vertical, horizontal and connection steel follows the structural design.

03

Concrete

Concrete surrounds the designed reinforcement within the permanent formwork.

04

Structural Continuity

Walls, corners, junctions and floors become one coordinated reinforced concrete system.

The element makes assembly practical. The reinforcement and concrete create the structural system.
02 · Handling & Site Logic

No heavy wall-lifting machinery required.

The PHC wall system is designed around manually handled elements. Instead of lifting complete heavy wall units into place, the wall geometry is assembled first and the reinforced concrete structure is created in situ.

Heavy Prefabricated Route

Lift the structure.

01 Large structural components
02 Heavy lifting operation
03 Crane-dependent erection logistics
04 Site access influenced by lifting equipment
VS
ISB® PHC-250

Assemble the form. Create the structure in place.

01 Lightweight wall elements
02 Manual wall-element positioning
03 Reinforcement installed within the system
04 Reinforced concrete structure completed in situ
Wall assembly does not depend on cranes or heavy wall-lifting equipment.

Other project activities may still use construction equipment according to the individual foundation, floor, concrete, access or site methodology.

03 · Production Planning

Cut less. Reuse more.

Element efficiency begins before material reaches the construction site. Project geometry is analysed for element layout and cutting. Pieces remaining from one position can be assigned to another suitable location in the building rather than automatically becoming waste.

Project-specific element allocation

ELEMENT A
Wall position A
Cut-off
↓ REALLOCATED
ELEMENT B
Reuse A
Wall position B
↓ OPTIMISED
ELEMENT C
Planned full utilisation
Factory Planning Logic

The building is analysed before production.

01
Building Geometry Walls, openings and dimensions establish the element demand.
02
Element Layout Elements are assigned to the actual building geometry.
03
Cut Planning Required cuts are evaluated as part of the production plan.
04
Off-Cut Allocation Suitable remaining pieces are reassigned to other building positions.
Structural panel waste can be reduced through project-specific production planning and reuse of suitable cut-off elements.

Where the element layout allows full allocation of cut pieces, the planned panel layout can achieve zero panel waste for that project-specific production set.

04 · Technical Interfaces

The structure is in the connections.

The wall element is only one part of the system. Foundations, corners, wall junctions, floors, openings and reinforcement zones define how individual parts become one coordinated reinforced concrete structure.

ISB building system base connection technical detail showing wall reinforcement and foundation interface
Base Connection
01

Base Connection

Foundation interface, reinforcement, moisture detailing and wall position.

02

Wall Corners

Reinforcement continuity through internal and external wall intersections.

03

Wall Junctions

Main-wall and intersecting-wall connections integrated into the structural grid.

04

Wall-to-Floor

Load transfer and reinforcement continuity between vertical and horizontal structure.

05

Openings

Upper, lower and side reinforcement around windows and doors.

06

Reinforcement

Horizontal, vertical and floor reinforcement defined by project engineering.

05 · Construction Programme

Speed comes from fewer separate processes.

Faster construction is not about asking the crew to work faster. The structural workflow can be shortened when multiple functions are integrated into one coordinated system and fewer independent construction stages are required.

Multi-Stage Construction

Separate processes. Separate interfaces.

Structural construction
Wall construction
Additional envelope layers
Separate interfaces and corrections
Coordination between successive trades
ISB® Structural Route

One coordinated structural sequence.

Position permanent formwork elements
Install structural reinforcement
Coordinate walls, junctions and floors
Concrete the reinforced structural system
Complete the structural envelope earlier
The construction process is accelerated by reducing and integrating separate technological work stages.

Actual programme duration remains project-specific and depends on scale, crew organisation, foundations, concrete operations, approvals, site logistics and the wider construction programme.

06 · Contractor Partnership

Learn the system. Build it. Repeat.

Contractors can enter the ISB® workflow without previous system experience. The objective is to transfer system logic, project documentation and construction knowledge so that experience gained on one project becomes useful on the next.

01

Train

Understand PHC elements, reinforcement, structural logic, details and assembly.

02

Prepare

Review drawings, element planning, site sequence and project-specific interfaces.

03

Build

Execute the system with technical documentation and coordinated support.

04

Repeat

Carry practical knowledge, sequencing and system familiarity into future projects.

The first project builds the structure.
It also builds the contractor's system experience.
Training · Technical preparation · Project support