Historical Context and Manufacturing Details

The Nuttall Building System house, a product of post-World War II innovation, represents a significant chapter in the history of British housing. Manufactured by Nuttall Houses (Richmond) Ltd, these properties were constructed between 1947 and 1964. This period marked a time of rapid urban development and housing shortages, necessitating the creation of efficient and cost-effective building solutions. The Nuttall houses were primarily built in suburban areas, catering to the growing demand for family homes.

Design and Construction Characteristics

General Design

Nuttall houses are typically two-storey semi-detached or terraced properties. They feature a medium pitch gable roof covered with interlocking concrete tiles or, in some variants, a flat roof covered with bituminous felt. The external walls are distinctive, with shiplap timber boarding on the first floor and tile hanging above. A single-storey porch extension often adorns the front elevation, adding to the aesthetic appeal and functionality of the property.

Structural Components

Substructure

The substructure of Nuttall houses consists of short bored piles below stanchions, providing a stable foundation. A concrete slab forms the base, with a damp-proof course (DPC) to prevent moisture ingress.

Frame

The main frame is constructed from 21 double rolled steel angle (RSA) stanchions, each forming a hollow box. This robust framework is complemented by four rolled steel channel (RSC) perimeter beams, two RSA perimeter ties, and seven roof trusses with lattice rafters and RSA ties. The entire frame is galvanised for protection against corrosion.

External Walls

The external walls are composed of horizontal shiplap timber boarding on timber battens up to the first floor level. Above this, bituminous felt and tile hanging on timber battens provide additional weatherproofing. The walls also feature a cavity filled with Stramit boards, a compressed straw material, offering both insulation and structural support.

Separating Walls and Partitions

Separating walls between properties are constructed using asbestos-faced Stramit board cavity walls, with glass fibre insulation in the cavity. Internal partitions are also made from Stramit board, maintaining consistency in materials and construction techniques.

Floors

The ground floor is a solid concrete slab, providing durability and stability. The first floor consists of plywood sheets on timber joists, supported by a timber floor beam. This combination ensures a sturdy and resilient flooring system.

Ceilings and Roof

Ceilings are typically plasterboard, offering a smooth and clean finish. The roof structure varies between properties, with some featuring bituminous felt, timber battens, and interlocking concrete tiles, while others have flat roofs with steel or timber joists, Stramit compressed straw boarding, and bituminous felt.

Typical Hazards and Risks

Structural Integrity

One of the primary concerns with Nuttall houses is the potential for structural degradation over time. The steel frame, although galvanised, can suffer from corrosion, particularly if the protective coating is compromised. This can lead to weakening of the structural integrity, posing significant safety risks.

Asbestos

The use of asbestos-faced Stramit boards in separating walls presents a health hazard. Asbestos, when disturbed, can release fibres into the air, which are harmful when inhaled. It is crucial to handle any renovation or repair work involving these materials with extreme caution, adhering to safety regulations and guidelines.

Moisture Ingress

The presence of a damp-proof course (DPC) is essential in preventing moisture ingress. However, over time, the effectiveness of the DPC can diminish, leading to potential issues such as rising damp. This can cause damage to the internal structure and finishes, as well as create an environment conducive to mould growth.

Insulation and Energy Efficiency

While the Stramit boards and glass fibre insulation provide some level of thermal efficiency, Nuttall houses may not meet modern energy efficiency standards. Upgrading insulation and implementing energy-saving measures can be necessary to improve the property’s overall performance and reduce energy costs.

Defective Premises Act Considerations

Nuttall houses are not specifically classified as defective under the Defective Premises Act. However, the potential issues related to structural integrity, asbestos, and moisture ingress necessitate thorough inspections and assessments. Ensuring that the property meets current safety and building standards is essential for both homeowners and investors.

Inspection and Assessment Guide

Pre-Inspection Preparation

Before conducting an inspection, gather all available information about the property, including historical data, previous inspection reports, and any known issues. This will provide a comprehensive understanding of the property’s background and potential areas of concern.

External Inspection

Roof

Examine the roof for signs of wear and tear, such as missing or damaged tiles, sagging, or water pooling on flat roofs. Check the condition of the bituminous felt and ensure that the roof trusses and rafters are intact and free from corrosion.

Walls

Inspect the external walls for any signs of damage, such as cracks, warping, or rot in the timber boarding. Pay particular attention to the tile hanging and bituminous felt, ensuring they are secure and weatherproof.

Porch Extension

Assess the single-storey porch extension for structural stability and any signs of deterioration. Check the roof, walls, and foundation for any issues that may compromise the integrity of the extension.

Internal Inspection

Structural Frame

Examine the steel frame for signs of corrosion or damage. Pay close attention to the stanchions, perimeter beams, and ties, ensuring they are in good condition and free from rust.

Walls and Partitions

Inspect the separating walls and internal partitions for any signs of damage or deterioration. Be cautious of asbestos-containing materials and avoid disturbing them. Look for any indications of moisture ingress or mould growth.

Floors

Check the ground and first floors for any signs of damage, such as cracks, uneven surfaces, or sagging. Ensure that the plywood sheets and timber joists are in good condition and free from rot or insect infestation.

Ceilings

Examine the plasterboard ceilings for any signs of damage, such as cracks, sagging, or water stains. Ensure that the ceiling structure is intact and free from any issues that may compromise its stability.

Moisture and Insulation

Damp-Proof Course

Check the effectiveness of the damp-proof course (DPC) by looking for signs of rising damp, such as discolouration, peeling paint, or damp patches on walls. Ensure that the DPC is intact and functioning correctly.

Insulation

Assess the insulation in the walls, floors, and roof. Ensure that the Stramit boards and glass fibre insulation are in good condition and provide adequate thermal efficiency. Consider upgrading insulation if necessary to meet modern energy efficiency standards.

Common Defects and Maintenance Tips

Corrosion of Steel Frame

Regularly inspect the steel frame for signs of corrosion and address any issues promptly. Apply protective coatings to prevent rust and ensure the longevity of the structural components.

Asbestos Management

If asbestos-containing materials are present, avoid disturbing them and seek professional advice for safe removal or encapsulation. Follow all safety regulations and guidelines to minimise health risks.

Moisture Control

Maintain the effectiveness of the damp-proof course (DPC) and address any signs of rising damp promptly. Ensure proper ventilation and drainage to prevent moisture ingress and mould growth.

Insulation Upgrades

Consider upgrading insulation to improve energy efficiency and reduce heating costs. Modern insulation materials can provide better thermal performance and contribute to a more comfortable living environment.

Regular Maintenance

Conduct regular maintenance checks on the roof, walls, floors, and other structural components. Address any issues promptly to prevent further deterioration and ensure the property’s long-term stability and safety.

Conclusion

The Nuttall Building System house represents a unique and historically significant chapter in British housing. While these properties offer a range of benefits, including distinctive design and robust construction, they also present certain challenges and risks. By understanding the typical characteristics, potential hazards, and maintenance requirements, home buyers and investors can make informed decisions and ensure the long-term safety and stability 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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