Understanding the Multispan House

The Multispan house, a distinctive type of system-built property, emerged in the 1960s as part of the post-war housing boom in the UK. These homes were designed to address the urgent need for affordable and quickly constructed housing. As an expert surveyor, I will delve into the intricacies of Multispan houses, providing you with a detailed understanding of their construction, typical characteristics, potential hazards, and inspection tips.

Historical Context and Manufacturers

Origins and Purpose

The Multispan house was developed during the 1960s, a period marked by a significant demand for housing due to the post-war population surge. The primary goal was to create homes that could be constructed rapidly and economically. These houses were predominantly built in suburban areas, providing affordable housing solutions for families.

Key Manufacturers and Designers

Several manufacturers and designers were involved in the production of Multispan houses. While specific names of manufacturers are not always documented, it is known that these houses were part of a broader trend of system-built properties during that era. The design and construction methods were influenced by the need for efficiency and cost-effectiveness.

Typical Characteristics of Multispan Houses

Architectural Features

Multispan houses are typically detached bungalows, characterized by their shallow pitch gable roofs covered with tiles. The external walls are rendered throughout, with horizontal timber boarding to the gable apex. These features make them easily identifiable and distinguishable from other property types.

Construction Details

Roof

The roof of a Multispan house is a shallow pitch gable design, covered with tiles. This design choice was likely made to simplify construction and reduce costs. However, it also means that the roof may be more susceptible to certain types of wear and tear over time.

Walls

The external walls are rendered, providing a uniform appearance. The horizontal timber boarding at the gable apex adds a distinctive touch. The rendering helps protect the underlying structure from the elements, but it can also hide potential issues such as cracks or dampness.

Floors

The specific details of the ground and first floors are not well-documented. However, it is likely that these houses were built with concrete ground floors and timber or concrete first floors, common practices in system-built homes of that era.

Main Frame

The main frame of Multispan houses is typically steel, a material chosen for its strength and durability. Steel frames allowed for quicker construction and provided a robust structure. However, steel can be prone to corrosion if not properly protected.

Potential Hazards and Risks

Structural Issues

One of the primary concerns with Multispan houses is the potential for structural issues. The steel frame, while strong, can corrode over time, especially if exposed to moisture. This can compromise the integrity of the entire structure.

Damp and Moisture

The rendered external walls can sometimes hide underlying damp issues. If the rendering cracks or becomes damaged, moisture can penetrate the walls, leading to dampness and potential mould growth inside the property.

Roof Problems

The shallow pitch of the roof can make it more susceptible to water pooling and leaks. Over time, the tiles may become damaged or dislodged, leading to potential water ingress.

Insulation and Energy Efficiency

Multispan houses, like many system-built homes from the 1960s, may not meet modern standards for insulation and energy efficiency. This can result in higher heating costs and a less comfortable living environment.

Legal Considerations: Defective Premises Act

Classification as Defective

Multispan houses are not specifically classified as defective under the Defective Premises Act. However, like any older property, they may have issues that need to be addressed to ensure they meet current safety and habitability standards.

Legal Implications

If you are purchasing a Multispan house, it is essential to have a thorough survey conducted to identify any potential defects. This will help you understand the scope of any necessary repairs and ensure that the property is safe and habitable.

Inspection Tips for Multispan Houses

Pre-Inspection Preparation

Before conducting an inspection, gather as much information as possible about the property. This includes any previous survey reports, maintenance records, and details about any renovations or repairs that have been carried out.

External Inspection

Roof

Examine the roof for any signs of damage or wear. Look for missing or damaged tiles, and check for any signs of water pooling or leaks. Pay particular attention to the gable apex, where the horizontal timber boarding is located.

Walls

Inspect the rendered external walls for any cracks or damage. Check for signs of dampness or mould, which could indicate underlying issues. Pay attention to the condition of the rendering and any areas where it may be peeling or flaking.

Internal Inspection

Structural Integrity

Check for any signs of structural issues, such as cracks in the walls or ceilings. Pay particular attention to areas around windows and doors, where movement or settling may be more apparent.

Damp and Moisture

Use a moisture meter to check for dampness in the walls and floors. Look for any signs of mould or mildew, which could indicate ongoing moisture problems.

Insulation and Energy Efficiency

Assess the insulation in the property, particularly in the roof and walls. Check for any drafts or cold spots, which could indicate poor insulation or gaps in the building envelope.

Common Defects in Multispan Houses

Corrosion of Steel Frame

One of the most common issues with Multispan houses is the corrosion of the steel frame. This can be caused by exposure to moisture and can compromise the structural integrity of the property. Regular inspections and maintenance are essential to identify and address any signs of corrosion.

Cracks in Rendering

The rendered external walls can develop cracks over time, allowing moisture to penetrate and cause dampness. Regular inspections and prompt repairs are necessary to maintain the integrity of the rendering and prevent moisture ingress.

Roof Leaks

The shallow pitch of the roof can make it more susceptible to leaks. Regular inspections and maintenance of the roof tiles are essential to prevent water ingress and protect the interior of the property.

Poor Insulation

Many Multispan houses may not meet modern standards for insulation and energy efficiency. Upgrading the insulation in the roof and walls can help improve the comfort and energy efficiency of the property.

Maintenance and Improvement Tips

Regular Inspections

Conduct regular inspections of the property to identify and address any potential issues before they become major problems. This includes checking the roof, walls, and steel frame for any signs of damage or wear.

Addressing Corrosion

If you identify any signs of corrosion in the steel frame, it is essential to address them promptly. This may involve treating the affected areas with rust inhibitors and applying protective coatings to prevent further corrosion.

Repairing Cracks

Repair any cracks in the rendered external walls promptly to prevent moisture ingress. This may involve filling the cracks with appropriate materials and repainting or re-rendering the affected areas.

Upgrading Insulation

Consider upgrading the insulation in the roof and walls to improve the energy efficiency of the property. This can help reduce heating costs and create a more comfortable living environment.

Conclusion

Multispan houses, with their distinctive architectural features and system-built construction, offer a unique housing option for buyers and investors. However, like any older property, they come with their own set of challenges and potential issues. By understanding the typical characteristics, potential hazards, and maintenance requirements of Multispan houses, you can make informed decisions and ensure the long-term safety and habitability of your 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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