Overview of the Industricon House

The Industricon house, also known as the Willett Industricon, is a unique property type that emerged in the early 1970s. Manufactured by Willett Industricon Ltd and designed for rapid construction, these homes were built in 1971, with a total of 28 units produced. The Industricon house is a notable example of system-built properties, which were developed to address the housing shortages of the time. These properties are typically found in suburban areas and are known for their distinctive construction methods and materials.

Historical Context and Manufacturing Details

Manufacturer and Designer

The Industricon house was manufactured by Willett Industricon Ltd, a company that specialized in system-built properties. The design aimed to provide affordable and quickly constructed housing solutions during a period of significant housing demand in the UK. The designer’s identity remains less documented, but the construction principles reflect the era’s emphasis on efficiency and cost-effectiveness.

Period Built and Number of Units

The Industricon houses were built in 1971, with only 28 units constructed. This limited production run makes these properties relatively rare, adding a layer of uniqueness for potential buyers and investors.

Alternative Names

The Industricon house is also known as the Willett Industricon, reflecting the manufacturer’s name. This alternative naming can be useful when researching or discussing these properties.

Identification Characteristics

Property Types

The Industricon house comes in two main configurations: bungalows and two-storey houses. These variations cater to different housing needs and preferences, offering options for both single-level living and multi-storey accommodation.

Roof Design

The roofs of Industricon houses are either shallow pitch gable roofs covered with concrete tiles or flat roofs covered with bituminous felt. This roofing choice impacts the property’s aesthetic and maintenance requirements.

External Walls

The external front and rear walls are constructed from timber boarding panels up to the first-floor level, with horizontal timber boarding above. The gable walls are made of Precast Reinforced Concrete (PRC) panels, providing structural integrity and a distinctive appearance.

References

The construction and design of Industricon houses are documented in several references, including the CIBSA 1970 and NBA Certificates from October 1966 and March 1971. These references provide valuable insights into the building standards and practices of the time.

Construction Details

Substructure

The substructure of Industricon houses consists of PRC ground beams and a Damp Proof Course (DPC). This foundation system ensures stability and protection against moisture ingress.

Frame

The main frame comprises various PRC columns and beams, including 15″ x 6″ and 6″ x 6″ PRC columns, 16″ x 6″ PRC perimeter beams, and 13″ x 6″ PRC beams. A rebated PRC spine beam is bolted to the PRC perimeter beams via Mild Steel (MS) angles, providing a robust structural framework.

External Walls

The external walls feature storey-height timber frame panels clad with timber boarding up to the first-floor level, with horizontal timber boarding above. These panels are lined with foil-backed plasterboard and insulated between the frame studs. The gable walls consist of storey-height 3″ PRC panels, a cavity with insulation, and another layer of 3″ PRC panels, ensuring thermal efficiency and structural strength.

Separating Wall

The separating wall between properties is a storey-height 3″ PRC panel cavity wall with 1″ wire-reinforced insulation in the cavity. This design provides sound insulation and fire resistance.

Partitions

Internal partitions are made of honeycomb plasterboard, offering lightweight and easy-to-install solutions for dividing spaces within the property.

Floors

The ground floor is constructed from concrete, providing a durable and stable base. The first floor features timber boarding on timber joists, offering a traditional and comfortable living surface.

Ceilings

Ceilings are made of plasterboard, a common material that provides a smooth finish and can be easily decorated.

Roof

The roof structure consists of timber trussed rafters and concrete tiles. Some variants may have roofs made of timber joists, Stramit board, and bituminous felt, offering different aesthetic and functional characteristics.

Typical Hazards and Risks

Structural Integrity

One of the primary concerns with Industricon houses is the potential degradation of PRC elements. Over time, PRC can suffer from carbonation, leading to the corrosion of embedded steel reinforcement. This can compromise the structural integrity of the property.

Moisture Ingress

The use of timber boarding and PRC panels can make these properties susceptible to moisture ingress, particularly if the DPC is compromised or if there are issues with the roofing materials. Moisture ingress can lead to timber decay and other related problems.

Insulation and Energy Efficiency

While the original design includes insulation, the standards from the 1970s may not meet current energy efficiency requirements. Upgrading insulation and improving thermal performance can be necessary to reduce energy costs and enhance comfort.

Asbestos

Given the construction period, there is a possibility that asbestos-containing materials were used in some components. Asbestos poses significant health risks if disturbed, so professional assessment and removal are essential.

Defective Premises Act Considerations

The Industricon house is not explicitly classed as defective under the Defective Premises Act. However, the potential issues with PRC elements and other construction materials mean that thorough inspections and assessments are crucial. Ensuring that any defects are identified and addressed can help mitigate risks and ensure compliance with relevant regulations.

Inspection and Assessment Guide

Visual Inspection

When inspecting an Industricon house, start with a thorough visual inspection. Look for signs of structural damage, such as cracks in PRC elements, sagging roofs, or uneven floors. Check for moisture ingress, particularly around windows, doors, and roof junctions.

PRC Assessment

Assess the condition of PRC elements using guidance from sources such as BRE Digest 444 (Parts 1-3) and BR 254. Check for signs of carbonation and corrosion of steel reinforcement. If necessary, engage a specialist to conduct a more detailed assessment.

Insulation and Energy Efficiency

Evaluate the insulation levels in walls, floors, and roofs. Consider upgrading insulation to meet current standards and improve energy efficiency. Check for draughts and ensure that windows and doors are properly sealed.

Asbestos Survey

Given the potential presence of asbestos, commission a professional asbestos survey. If asbestos-containing materials are found, ensure they are managed or removed in accordance with health and safety regulations.

Moisture and Timber Decay

Inspect timber elements for signs of decay or rot. Use a moisture meter to check for elevated moisture levels in walls, floors, and roofs. Address any sources of moisture ingress and repair or replace affected timber.

Roof and Guttering

Examine the roof covering for signs of wear or damage. Check the condition of gutters and downpipes, ensuring they are clear and functioning correctly. Address any issues to prevent water ingress and related problems.

Typical Defects and Maintenance

PRC Degradation

As mentioned, PRC elements can suffer from carbonation and steel reinforcement corrosion. Regular inspections and timely repairs are essential to maintain structural integrity.

Timber Decay

Timber elements, particularly in external walls and roofs, can be prone to decay if exposed to moisture. Regular maintenance, including painting and sealing, can help protect timber and extend its lifespan.

Roof Issues

Flat roofs covered with bituminous felt can be prone to leaks and require regular maintenance. Shallow pitch gable roofs with concrete tiles may also need periodic inspection and repair to address any damage or wear.

Insulation Upgrades

Upgrading insulation in walls, floors, and roofs can improve energy efficiency and comfort. Consider modern insulation materials and techniques to enhance thermal performance.

Asbestos Management

If asbestos is present, ensure it is managed safely. Engage professionals for any removal or encapsulation work, and follow all relevant health and safety guidelines.

Conclusion

The Industricon house represents a unique and historically significant property type in the UK housing market. While these homes offer distinctive features and construction methods, they also come with specific challenges and maintenance requirements. By understanding the typical characteristics, potential hazards, and necessary inspections, home buyers and investors can make informed decisions and ensure the long-term safety and value of their investment.

At Flettons, we’re committed to safeguarding your investment. When considering a property purchase, trust our seasoned expertise to reveal any hidden threats. For a thorough building survey, get your instant quote through our quote calculator or reach out directly at 0203 691 0451. Your home’s safety is our top priority.

---