Understanding the Sherwood House

The Sherwood House, a distinctive system-built property, stands as a testament to the architectural and construction innovations of the late 1960s. Designed by Mason and Richards and Partners and manufactured by Tarmac Building Ltd, these homes were constructed between 1966 and 1969. With only 140 units built, they are a rare find in the UK property market. Typically located in suburban areas, these properties are known for their unique design and construction features.

Key Characteristics of Sherwood Houses

Sherwood Houses are primarily bungalows and semi-detached two-storey houses. They are easily identifiable by their medium pitch gable roofs, which are covered with either concrete tiles or asbestos cement slates. The front and rear external walls are a combination of brick, render, horizontal timber boarding, or vertical tongue and groove (T&G) boarding. The gable walls are usually constructed of brick up to the eaves level, with tile hanging at the apex. Some of these dwellings also feature a single-storey flat roof entrance lobby, adding to their unique charm.

Construction Details

The construction of Sherwood Houses is a fascinating blend of traditional and modern techniques. The substructure consists of concrete strip footings with a vented brick underbuilding. A damp-proof course (DPC) is also included to prevent moisture ingress. The external walls are built using a balloon frame construction method. Eaves height timber frame panels are sheathed externally with plywood, overlaid with building paper. The front and rear walls are directly clad with vertical T&G boarding, while the gable wall is separately clad with brick. The internal lining consists of foil-backed plasterboard, with mineral fibre insulation placed between the frame studs.

The separating walls are timber frame cavities lined with plasterboard, while the partitions are timber stud lined with plasterboard. The ground and first floors are constructed with plywood on timber joists. Ceilings are made of plasterboard, with foil-backed plasterboard used in the roof space. The roof itself is supported by timber trusses, covered with bituminous felt and concrete tiles, and insulated with mineral fibre at the ceiling level.

Variants and Alternatives

Some Sherwood Houses feature solid ground floors, while others have front and rear external walls directly clad with combinations of brick, rendered plywood, horizontal timber boarding, or vertical T&G boarding. The gable wall apex may be clad with tile hanging on timber battens, and the roof cover may consist of asbestos cement slates.

Potential Hazards and Risks

When considering the purchase of a Sherwood House, it is crucial to be aware of potential hazards and risks associated with this property type. One of the primary concerns is the use of asbestos cement slates in the roofing. Asbestos, a hazardous material, can pose significant health risks if disturbed. It is essential to have a professional survey conducted to assess the presence and condition of asbestos in the property.

Another potential risk is the condition of the timber frame construction. Over time, timber can be susceptible to rot, decay, and insect infestation. A thorough inspection of the timber frame is necessary to ensure its structural integrity. Additionally, the mineral fibre insulation used in these properties may have settled or degraded over time, reducing its effectiveness. An assessment of the insulation is recommended to determine if it needs to be replaced or upgraded.

Defective Premises Act Considerations

Sherwood Houses are not classified as defective under the Defective Premises Act. However, it is still essential to conduct a comprehensive survey to identify any potential issues that may affect the property’s safety and value. Engaging a qualified surveyor with experience in system-built properties can provide valuable insights and recommendations for addressing any concerns.

Inspection Tips for Sherwood Houses

When inspecting a Sherwood House, there are several key areas to focus on to ensure a thorough assessment:

1. Roof Inspection: Check for any signs of damage or wear on the concrete tiles or asbestos cement slates. Look for missing or cracked tiles, as well as any signs of water ingress or leaks.

2. External Walls: Examine the condition of the brick, render, and timber cladding. Look for any signs of cracking, bulging, or deterioration. Pay particular attention to the gable walls and the tile hanging at the apex.

3. Timber Frame: Inspect the timber frame for any signs of rot, decay, or insect infestation. Check for any areas where the timber may be exposed to moisture, as this can accelerate deterioration.

4. Insulation: Assess the condition of the mineral fibre insulation. Look for any signs of settling or degradation, and consider upgrading the insulation if necessary to improve energy efficiency.

5. Asbestos Assessment: If the property has asbestos cement slates, have a professional asbestos survey conducted to determine the presence and condition of asbestos. Follow recommended safety procedures for handling and removal if necessary.

6. Damp-Proof Course: Check the condition of the damp-proof course to ensure it is effectively preventing moisture ingress. Look for any signs of rising damp or moisture-related issues.

7. Structural Integrity: Assess the overall structural integrity of the property, paying attention to any signs of movement, settlement, or structural defects.

Common Defects in Sherwood Houses

While Sherwood Houses are generally well-constructed, there are some common defects that may be encountered:

• Roofing Issues: As mentioned earlier, the roofing materials may be prone to damage or wear over time. Regular maintenance and inspections are essential to prevent leaks and water damage.

• Timber Frame Deterioration: The timber frame construction can be susceptible to rot, decay, and insect infestation. Regular inspections and maintenance are necessary to ensure the structural integrity of the property.

• Insulation Degradation: The mineral fibre insulation may settle or degrade over time, reducing its effectiveness. Upgrading the insulation can improve energy efficiency and comfort.

• Moisture Ingress: Issues with the damp-proof course or external cladding can lead to moisture ingress, resulting in damp and mould problems. Addressing these issues promptly is crucial to prevent further damage.

• Asbestos Concerns: If asbestos cement slates are present, they may pose health risks if disturbed. Professional assessment and safe handling are essential to mitigate these risks.

Maintaining and Enhancing Sherwood Houses

To maintain and enhance the value of a Sherwood House, consider the following steps:

1. Regular Maintenance: Conduct regular inspections and maintenance of the roof, external walls, and timber frame to address any issues promptly.

2. Insulation Upgrades: Consider upgrading the insulation to improve energy efficiency and reduce heating costs. Modern insulation materials can provide better thermal performance and comfort.

3. Asbestos Management: If asbestos is present, follow recommended safety procedures for handling and removal. Engage a professional asbestos removal service if necessary.

4. Moisture Control: Ensure the damp-proof course is functioning effectively and address any issues with external cladding to prevent moisture ingress.

5. Energy Efficiency Improvements: Consider installing energy-efficient windows and doors, as well as upgrading heating and ventilation systems to enhance the property’s energy performance.

6. Aesthetic Enhancements: Consider updating the property’s exterior with modern cladding materials or a fresh coat of paint to enhance its curb appeal.

Conclusion

The Sherwood House is a unique and distinctive property type that offers a blend of traditional and modern construction techniques. While these homes are not classified as defective under the Defective Premises Act, it is essential to conduct a thorough survey to identify any potential issues. By understanding the key characteristics, potential hazards, and common defects associated with Sherwood Houses, home buyers and investors can make informed decisions and take appropriate steps to maintain and enhance the 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.

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