Historical Context and Manufacturing

The Atherton house, a distinctive property type in the UK, holds a unique place in the annals of British housing history. Designed by Atherton & Sharples, these homes were constructed in 1919, a period marked by a significant housing shortage post-World War I. Only 24 of these properties were built, making them a rare find in today’s property market. Often referred to by their alternative name, “Clip Slab,” these houses are typically found in specific regions where post-war housing initiatives were most active.

Identification Characteristics

Recognising an Atherton house is relatively straightforward once you know what to look for. These properties are two-storey terraced houses, featuring a medium pitch hipped roof covered with pantiles. The external walls are rendered with roughcast, giving them a distinctive textured appearance. These characteristics not only define the aesthetic of the Atherton house but also contribute to its structural integrity and durability.

Typical Construction Features

Understanding the construction features of an Atherton house is crucial for both buyers and investors. These homes were built with specific materials and techniques that were innovative for their time but may present unique challenges today.

Substructure

The substructure of an Atherton house consists of a concrete raft foundation and a concrete slab. This type of foundation was chosen for its stability and ability to support the weight of the house. A damp-proof course (DPC) is also present, which is essential for preventing moisture from rising through the structure.

Frame

The main frame of the Atherton house is constructed using 22 rolled steel joist (RSJ) stanchions and 8 RSJ perimeter beams. This steel framework provides the house with its primary structural support. However, the protective coating of the steel is not known, which could be a point of concern for potential buyers.

External Walls

The external walls are made of rendered dense concrete slabs, with a cavity and clinker concrete slabs. This combination of materials was chosen for its durability and insulating properties. However, the use of clinker concrete, which contains unstable fractions of unburnt coal, can pose potential risks.

Separating Wall and Partitions

The separating wall between properties is also made of clinker concrete slab cavity walls. The partitions within the house are not well-documented, which could be a consideration during renovation or inspection.

Floors

The ground floor is constructed from concrete, providing a solid and stable base. The first floor features tongue and groove (T&G) boarding on timber joists, a common construction method that offers both strength and flexibility.

Ceilings and Roof

The ceilings of Atherton houses are not well-documented, but the roof is a conventional timber structure covered with pantiles. This type of roofing is both durable and aesthetically pleasing, contributing to the overall charm of the property.

Typical Hazards and Risks

While Atherton houses have many appealing features, they also come with certain hazards and risks that potential buyers should be aware of.

Unstable Fractions of Unburnt Coal

One of the primary concerns with Atherton houses is the presence of unstable fractions of unburnt coal in the aggregate used for construction. This can lead to structural instability over time, making it essential to conduct a thorough inspection before purchase.

Steel Frame Corrosion

The steel frame, while providing excellent structural support, is susceptible to corrosion, especially if the protective coating is compromised or unknown. Corrosion can weaken the structural integrity of the house, leading to costly repairs.

Moisture and Damp Issues

Despite the presence of a damp-proof course, moisture and damp issues can still arise, particularly if the DPC has been compromised over time. This can lead to mould growth and other related problems, affecting both the structure and the health of the occupants.

Defective Premises Act Considerations

The Defective Premises Act 1972 imposes a duty on builders, developers, and landlords to ensure that a property is fit for habitation. While Atherton houses are not specifically listed as defective under this act, the potential risks associated with their construction materials and methods mean that they should be inspected thoroughly to ensure compliance.

Inspection Guidelines for Surveyors

When inspecting an Atherton house, surveyors should follow specific guidelines to ensure a comprehensive assessment.

External Inspection

• Roof: Check the condition of the pantiles and the timber structure. Look for signs of wear, damage, or potential leaks.
• Walls: Inspect the rendered dense concrete slabs for cracks, bulges, or signs of deterioration. Pay particular attention to the presence of unburnt coal in the aggregate.
• Foundation: Examine the concrete raft foundation and slab for any signs of movement or cracking.

Internal Inspection

• Steel Frame: Assess the condition of the RSJ stanchions and perimeter beams. Look for signs of corrosion or damage.
• Floors: Check the concrete ground floor and the T&G boarding on timber joists for stability and signs of wear.
• Moisture: Use a moisture meter to detect any damp issues, particularly around the DPC and in areas prone to moisture ingress.

Additional Considerations

• Protective Coating: If possible, determine the type and condition of the protective coating on the steel frame.
• Partitions and Ceilings: While not well-documented, inspect these areas for any signs of damage or potential issues.

Typical Defects in Atherton Houses

Understanding the typical defects that can occur in Atherton houses can help buyers and investors make informed decisions.

Structural Instability

Due to the presence of unburnt coal in the aggregate, structural instability can be a significant concern. This can manifest as cracks in the walls, floors, or foundation.

Corrosion of Steel Frame

Corrosion of the steel frame is another common defect. This can weaken the structural integrity of the house and lead to costly repairs.

Moisture and Damp Issues

Moisture and damp issues are prevalent in older properties, including Atherton houses. These can lead to mould growth, wood rot, and other related problems.

Roof and Wall Deterioration

The roof and walls of Atherton houses can deteriorate over time, particularly if they have not been well-maintained. This can result in leaks, drafts, and other issues that affect the comfort and safety of the occupants.

Maintaining and Improving Atherton Houses

Maintaining and improving an Atherton house requires a proactive approach to address potential issues and enhance the property’s value.

Regular Inspections

Conducting regular inspections is crucial to identify and address issues before they become significant problems. This includes checking the condition of the roof, walls, foundation, and steel frame.

Addressing Corrosion

If corrosion is detected in the steel frame, it should be addressed promptly. This may involve treating the affected areas with anti-corrosion coatings or replacing damaged sections.

Managing Moisture

Managing moisture is essential to prevent damp issues. This can include repairing or replacing the damp-proof course, improving ventilation, and addressing any leaks or water ingress.

Roof and Wall Maintenance

Regular maintenance of the roof and walls can help prevent deterioration. This includes repairing any damage, repainting or re-rendering the walls, and ensuring the roof is in good condition.

Enhancing Energy Efficiency

Improving the energy efficiency of an Atherton house can enhance its comfort and reduce energy costs.

Insulation

Adding insulation to the walls, roof, and floors can significantly improve the energy efficiency of the property. This can include cavity wall insulation, loft insulation, and underfloor insulation.

Windows and Doors

Upgrading to double or triple-glazed windows and doors can help reduce heat loss and improve the property’s overall energy efficiency.

Heating and Cooling Systems

Installing modern, energy-efficient heating and cooling systems can enhance the comfort of the property and reduce energy costs. This can include upgrading to a high-efficiency boiler, installing a heat pump, or adding air conditioning.

Legal and Financial Considerations

When buying an Atherton house, there are several legal and financial considerations to keep in mind.

Legal Compliance

Ensure that the property complies with all relevant building regulations and standards. This includes checking for any necessary permits or approvals for renovations or improvements.

Financing

Securing financing for an Atherton house may require additional considerations due to the unique construction materials and potential risks. It’s essential to work with a lender who understands these factors and can provide appropriate financing options.

Insurance

Obtaining insurance for an Atherton house may also require special considerations. Ensure that the policy covers potential risks associated with the property’s construction materials and methods.

Conclusion

The Atherton house, with its unique construction and historical significance, offers a distinctive opportunity for home buyers and investors. Understanding the typical characteristics, potential hazards, and maintenance requirements of these properties is crucial for making informed decisions. By conducting thorough inspections and addressing any issues promptly, buyers can ensure that their investment is both safe and valuable.

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.

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