GooPlast
Voided Slab System
FAST CONSTRUCTION SOLUTIONS

Voided Slab System

Voided Slab Formwork System

A reinforced-concrete slab solution made from recycled plastics that allows large spans to be crossed beamlessly, creating voids inside the slab to deliver up to 25% savings on concrete and steel.

Voided slab formworks remain inside the concrete and form layers above and below. With a single concrete pour, this innovation creates an upright lattice or grid structure closed top and bottom by flat plates — significantly reducing concrete and steel quantities, making it economical and eco-friendly.

The voided slab system is the perfect solution for slabs that carry heavy loads over wide spans without using beams. Its lightweight design and modular structure allow fast and easy application, while giving designers full architectural freedom to adjust static and geometric parameters as desired.

Voided Slab Formwork System 1
Voided Slab Formwork System 2
Voided Slab Formwork System 3

Voided Slab Advantages

Voided Slab Advantages 1
Voided Slab Advantages 2
1

Reduces load on the structural system thanks to its ability to support light constructions.

2

Lowers construction costs by up to 25% by reducing concrete demand.

3

Cuts costs by using less reinforcement steel.

4

Saves time with faster and easier installation.

5

Scalable system that adapts to projects of different sizes.

6

Better performance for sound and thermal insulation.

7

Fire resistance, durability against environmental impacts and moisture resistance.

8

Reduces XPS and EPS usage, less harmful to the environment.

9

Better performance for water insulation.

10

Reduces overall building height.

11

Suitable and economical for wider spans.

12

Suitable for thinner columns and foundations.

13

Provides high durability.

14

Lighter than conventional slab systems, providing the same strength with less material in reinforced-concrete structures.

15

Offers architectural design freedom and flexibility.

16

Reduces the weight of reinforced-concrete structures, making them safer against earthquakes.

17

Provides excellent sound insulation.

18

Stackable design saves storage space on the construction site.

Voided Slab Technical Details

HeightDimensionsFoot HeightVolume per UnitPallet DimensionsPallet Pieces
H 10 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0217 m³110 x 110 x 247 cm720 pc
H 13 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0289 m³110 x 110 x 212 cm600 pc
H 16 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0354 m³110 x 110 x 254 cm440 pc
H 20 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0439 m³110 x 110 x 236 cm460 pc
H 23 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0493 m³110 x 110 x 253 cm440 pc
H 26 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0550 m³110 x 110 x 249 cm419 pc
H 29 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0572 m³110 x 110 x 256 cm398 pc
H 30 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0643 m³110 x 110 x 253 cm390 pc
H 33 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0710 m³110 x 110 x 247 cm382 pc
H 36 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0792 m³110 x 110 x 237 cm370 pc
H 40 cm52 x 52 cm0-7-8-9-10-11-12 cm0.0875 m³110 x 110 x 240 cm340 pc

Our Certificates

ISO 9001:2015

International standard for quality management systems. Defines the processes required to manage and continuously improve product and service quality and increase customer satisfaction.

ISO 14001:2015

International standard for environmental management systems. Defines the processes required to manage and reduce environmental impacts.

ISO 45001:2018

International standard for occupational health and safety management systems. Defines the processes required to manage OH&S risks and protect employees.

Installation

1

Formwork Preparation

First, prepare the formwork that will receive the concrete and place its supports. Cover the formwork surface with timber decking. Place lower reinforcement bars in two perpendicular directions per the design and prepare the cage for the upper reinforcement.

2

Voided Slab Forms

Arrange the rib width per the dimensions specified in the structural project. Conical feet under the formwork lift the voided slab forms, creating the lower slab. If double or triple elements are used, install them first.

3

Reinforcement Layout

Complete reinforcement placement per the design including upper bars and shear and punching reinforcement.

4

Concrete Pouring

To prevent the formwork surfaces from floating, pour in two stages. First pour an initial layer to the height of the conical feet. Continue pouring until this layer hardens and becomes semi-fluid.

5

Continuation of Pouring

Once concrete pouring is properly set, restart pouring to fully cover the voided slab system. Then level the pour conventionally.

Frequently Asked Questions

The voided slab system is a permanent formwork made from recycled plastics that stays inside the concrete and creates voids inside the slab, lightening the structure. It significantly reduces concrete and steel use and enables crossing wide spans without beams.
It is made from high-strength recycled polypropylene with the strength to bear concrete loads and resistance to corrosion, moisture and chemicals.
Industrial and commercial buildings, offices, malls, parking lots, education and healthcare facilities, high-rise residences and any reinforced-concrete slab requiring wide spans.
Lighter structures, up to 25% less concrete and steel, faster installation, sound and thermal insulation, contribution to seismic performance, architectural freedom, eco-friendliness.
Yes. The system stays permanently in the concrete — no removal, no waste, no scrap. It retains its form and performance throughout the building's life.
Yes. Through the air voids created in the slab, concrete demand is reduced by up to 25% — saving cost and lowering carbon footprint.
Forms are produced with a 52 x 52 cm base in heights from H 10 cm to H 40 cm. Conical foot height is adjustable between 0–12 cm to achieve project-specific total slab height.
The structural engineer designs it considering concrete height, span and load conditions. GooPlast technical team works directly with structural engineers on form selection and detailing.
No. Thanks to its conical-footed, interlocking design, it installs quickly without special equipment. After short training the field team can run the application independently.
High-rise buildings, malls, hospitals, schools, warehouses, parking lots, office blocks — any reinforced-concrete structure that benefits from wide spans and lightweight slabs.
Lighter than traditional solid or waffle slabs, requires less concrete and reinforcement, faster installation, beamless wide spans and architectural flexibility.
Made from recycled plastic, reduces concrete and steel use lowering carbon emissions, replaces waste-producing materials like EPS/XPS. Zero on-site waste and eco-friendly.
Commercial and industrial structures requiring wide spans, multi-story residences, public buildings, education campuses and healthcare facilities are leading applications.
Up to 25% material savings on concrete and steel, labor and time savings via fast installation, less formwork/scaffolding need, and reductions in column and foundation sizes thanks to lighter structures.
Its modular interlocking structure enables parametric designs and removes traditional formwork needs, enabling digital and standardized site production flows.

Packaging Sizes

Compared to traditional fill materials such as gravel, soil or polystyrene (EPS), it is significantly lighter.

25 m³

1 truck = soil or gravel

85 m³

1 truck = EPS (polystyrene)

22 m³

1 truck = aerated concrete

1100 m³

1 truck = Voided Slab System

Packaging Sizes

Forms can be stacked, requiring less storage space on the construction site.

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