Passive Slab – Five Reasons To Use One In Your Self-Build

 12th April 2022

The beginning of all great self-build homes comes from laying a solid foundation. This is where a passive slab comes in very useful.

When constructing a self-build using a passive slab, we always opt for Izodom foundations. The innovative slabs offer a whole host of benefits to the end-user such as high insulation levels, speed of installation and an extremely simple process that is unrivalled on any building site.

In this blog, we look at the five key reasons that any self-build should incorporate a passive slab into the plans of your home.

High insulation levels

A passive slab is a uniform layer of Izodom ICF laid at the foundations of the home. Once completed, the ICF is filled with concrete to create a highly insulated level at the base of your self-build. The ICF essentially acts as a ‘basin’ for the concrete of your slab, while also ensuring that the home does not have direct contact with the ground below.

The simplicity of the process

Installing a passive slab in your home is an extremely simple process from start to finish and is broken down into four key stages. First, you would excavate the site where the slab will stand. Next, the ICF formwork would be assembled. This is constructed using interlocking Izodom elements that are pre-cut and formed at production, allowing for ease of installation with no on-site modification required. Then, the slab is reinforced with either fibre reinforcement, steel mesh or straight rebar. Finally, the formwork is filled with concrete, ready for the next stage of your self-build – it’s worth noting here that no temporary shuttering or supporting of the insulation formwork is required.

Thermal bridge free junctions

A key benefit of passive slabs is the ability to create thermal bridge free junctions between the base and the walls of the self-build. Thermal bridges are areas in which heat can escape. These are generally at geometric junctions between walls, floors, and ceilings. Or, where the walls meet windows and doors. After all, why would you insulate walls to be thermal bridge free, for then the heat to escape at other points of the home?

Speed of installation

The speed of installation is also a great benefit provided by a passive slab. They take far less time when compared to more traditional foundation methods, with an average installation taking around 5 days from excavation, through to the concrete being poured.

Suitable for all site conditions

The great thing about passive slabs is they can be utilised on any site, regardless of conditions. They are extremely versatile, even on some harder to build on terrains, and are also perfect for split-level self-builds too.

Like to know the process of how these innovative slabs are installed? Check out our blog post on this right here.

Interested in incorporating a passive slab into your next self-build project? Get in touch with one of our specialist team today.

Last Updated: 12th April 2022

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