Cardboard Void Formers

The wide choice of diameters and strength of our tubes comes to the forefront in this application. We have supplied 50mm diameter cardboard void formers for the M16 building in London right up to 500mm diameter for support posts on the M4 Motorway.

Information On Cardboard Void Formers

What Is A Void Former?

Cardboard Void Formers are very important for architects and builders in keeping a structure secure until the concrete being used has set and solidified.

Advantages Over Metal

Cardboard is considerably lighter than metal but it is dense enough to bear large amounts of weight.

Added Strength With Cardboard Void Formers

Cardboard Void Formers can be left behind opposed to being removed which adds a filler to the structure, which in turn decreases the risk of the structure faltering. Architects are not only using void formers to make their structures lighter but also for added strength.

Eco Friendly

All of our products here at Essex Tubes are completely eco-friendly, the fibreboard used for our cardboard void formers is created from recycled materials. Our manufacturing process also does not create any chemical waste.

Quality Assurance

Our cardboard void formers are made from the highest quality materials available and will not falter under pressure from construction materials. Our products are vigorously tested to ensure maximum quality is achieved. When buying cardboard void formers from us, you won't be disappointed: we try our very best to provide you the highest quality cardboard void formers!

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High Quality Cardboard Void Formers

By choosing our cardboard void formers, builders benefit from long-term structural stability and reduced maintenance costs. The void created beneath the concrete slab mitigates future risks associated with reactive soils, enhancing the lifespan of the structure.

Join countless architects and builders who trust Essex Tubes for high quality cardboard void formers. Our commitment to excellence ensures that your construction projects are supported by reliable, eco-friendly solutions.

Frequently Asked Questions (FAQs)

What is a void former?

A void former (or void former tube) is a structural insert placed within concrete slabs or foundations to create a deliberate empty space (void). This gap reduces load, accommodates soil movement, or provides relief against uplift forces. In many cases, the void former becomes a permanent part of the structure rather than being removed after curing.

Why use cardboard void formers instead of metal?

Some advantages of cardboard void formers over metal include:

Lighter weight — easier handling and installation on site
Cost-efficiency — lower material and fabrication costs
Compatibility — sufficient strength for many structural needs when designed properly
Leave-in-place design — they don’t need to be removed, acting as filler within the structure

What diameter and strength options are available?

We can manufacture void formers in a wide range of diameters and wall thicknesses to suit your project’s specifications. We’ve supplied void formers from 50 mm all the way up to 500 mm diameter for demanding structural applications.

You can also choose wall strength and reinforcement levels depending on load, soil conditions, and concrete design.

Can you supply custom void former dimensions?

Yes, every void former is custom-manufactured to your required inner diameter, wall thickness, and length. Whether you need very narrow void formers or large diameters for major structural applications, we can deliver precisely what your design requires.

How do you choose a void former size for my project?

To pick the right void former, consider:

Required void size or diameter (based on design specs)
Structural load and soil conditions — ensuring the wall thickness can bear the imposed pressures
Concrete slab depth and reinforcement layout — so the void former fits within the structural layers
Compatibility with adjacent elements (foundations, beams, services)

We can help you calculate or recommend the right size when you provide your structural drawings or load data.