Understanding the MeTraTim House

The MeTraTim house, a distinctive system-built property, emerged during the mid-1960s, a period marked by rapid urban development and innovative construction techniques. Manufactured by Selleck Nicholls Williams Ltd, these homes were designed to address the housing demands of the time. Known by various names such as Metratrim, Selleck Nicholls, Selleck Nicholls & Williams, and SNW, these properties are a testament to the architectural ingenuity of their era.

Historical Context and Manufacturing Details

The MeTraTim houses were constructed between 1965 and 1968, a brief yet significant period that saw the production of approximately 420 units. These homes are predominantly found in suburban areas across the UK, where they were built to accommodate the growing population. The design and construction of these houses were spearheaded by Selleck Nicholls Williams Ltd, a company renowned for its innovative approach to system-built housing.

Architectural Characteristics

The MeTraTim houses are easily identifiable by their unique architectural features. They include bungalows and two- and three-storey semi-detached and terraced houses. A medium pitch gable roof covered with tiles is a common feature, providing both aesthetic appeal and functional benefits. The external walls are typically constructed using vertical timber boarding with vertical timber cover strips, or brick throughout. In some cases, the ground floor is clad with brick up to the window head level, with horizontal timber boarding above. Gable walls of some houses are entirely brick, adding to the structural diversity of these homes.

Design Variants and Features

Some MeTraTim houses feature galleries with a monopitch roof at the first-floor level and above, adding a unique architectural element. Additionally, certain dwellings have a shallow pitch roofed entrance porch, clad with brick, enhancing the overall aesthetic. These design variants reflect the adaptability of the MeTraTim system to different architectural preferences and site conditions.

Construction Details

The construction of MeTraTim houses is characterized by a platform frame construction method. The substructure consists of concrete strip footings with brick under-building and a damp-proof course (DPC) to prevent moisture ingress. The external walls are made of storey-height timber frame panels, sheathed externally with plywood overlaid with bituminous felt. The front and rear walls are directly clad with vertical timber boarding, while the gable wall is separately clad with brick. Internally, the walls are lined with plasterboard overlaid with a polyethylene vapour control layer, and paper laminated mineral fibre insulation is placed between the frame studs.

Internal Layout and Materials

The internal layout of MeTraTim houses is designed for functionality and comfort. Separating walls are constructed using a timber frame cavity lined with two layers of plasterboard, with insulation between the frame studs. Partitions are similarly constructed with timber studs lined with plasterboard. The ground floor is typically concrete, while the upper floors consist of plywood on timber joists. Ceilings are finished with plasterboard, providing a smooth and durable surface. The roof is constructed using timber trusses, bituminous felt, and tiles, with mineral fibre insulation at ceiling level to enhance thermal efficiency.

Potential Hazards and Risks

While the MeTraTim houses offer numerous benefits, they also present certain hazards and risks that potential buyers and investors should be aware of. One of the primary concerns is the potential for timber decay, particularly in areas where moisture ingress is prevalent. The use of bituminous felt and plywood in the construction can also pose a risk if not properly maintained, as these materials are susceptible to water damage over time.

Defective Premises Act Considerations

Under the Defective Premises Act, properties must be constructed in a manner that ensures they are safe and fit for habitation. While the MeTraTim houses are not explicitly classified as defective under this act, it is crucial for buyers to conduct thorough inspections to identify any potential issues. Engaging a professional surveyor with expertise in system-built properties can help uncover any hidden defects and ensure compliance with the act.

Inspection Tips for MeTraTim Houses

When inspecting a MeTraTim house, it is essential to focus on several key areas to ensure the property’s structural integrity and safety. Here are some practical tips for conducting a thorough inspection:

1. Roof and Guttering: Examine the roof for any signs of damage or wear, such as missing tiles or sagging areas. Check the guttering and downpipes for blockages or leaks, as these can lead to water ingress and subsequent timber decay.

2. External Walls: Inspect the external walls for any signs of cracking, bulging, or moisture penetration. Pay particular attention to the areas where different materials meet, such as the junction between brick and timber cladding.

3. Timber Frame: Assess the condition of the timber frame by looking for signs of rot, insect infestation, or structural movement. Use a moisture meter to detect any areas of high moisture content, which could indicate potential decay.

4. Insulation and Vapour Control: Check the insulation and vapour control layers for any signs of damage or deterioration. Ensure that the insulation is evenly distributed and that there are no gaps or voids that could compromise thermal efficiency.

5. Internal Walls and Ceilings: Inspect the internal walls and ceilings for any signs of cracking, staining, or dampness. Pay attention to areas around windows and doors, as these are common points of moisture ingress.

6. Floors: Examine the floors for any signs of movement, unevenness, or damage. Check for any areas of dampness or staining, which could indicate underlying issues with the substructure.

7. Services and Utilities: Ensure that all services and utilities, such as plumbing, electrical, and heating systems, are in good working order. Look for any signs of leaks, corrosion, or outdated components that may require replacement.

Common Defects in MeTraTim Houses

Despite their robust construction, MeTraTim houses can be prone to certain defects that may affect their long-term performance. Some of the most common issues include:

• Timber Decay: As previously mentioned, timber decay is a significant concern in MeTraTim houses, particularly in areas where moisture ingress is prevalent. Regular maintenance and timely repairs can help mitigate this risk.

• Thermal Bridging: The use of timber frame construction can lead to thermal bridging, where heat is lost through the structural elements of the building. Ensuring proper insulation and vapour control can help minimize this issue.

• Moisture Ingress: Moisture ingress can occur through various points in the building envelope, leading to potential damage to the timber frame and other components. Regular inspections and maintenance can help identify and address any areas of concern.

• Structural Movement: Over time, MeTraTim houses may experience structural movement due to settlement or other factors. Monitoring for signs of movement, such as cracking or distortion, can help prevent more significant issues from developing.

Maintenance and Upkeep

Proper maintenance and upkeep are essential to preserving the integrity and value of a MeTraTim house. Regular inspections, timely repairs, and preventative measures can help address potential issues before they become significant problems. Here are some maintenance tips to consider:

• Roof Maintenance: Regularly inspect the roof for any signs of damage or wear, and address any issues promptly. Clean gutters and downpipes to prevent blockages and ensure proper drainage.

• Timber Treatment: Treat exposed timber elements with appropriate preservatives to protect against decay and insect infestation. Ensure that any damaged or decayed timber is replaced promptly.

• Insulation and Ventilation: Ensure that insulation is properly installed and maintained to prevent thermal bridging and improve energy efficiency. Adequate ventilation is also crucial to prevent moisture buildup and condensation.

• Moisture Management: Address any sources of moisture ingress, such as leaks or poor drainage, to prevent damage to the building envelope and internal components.

• Structural Monitoring: Regularly monitor the property for any signs of structural movement or settlement, and address any issues promptly to prevent further damage.

Conclusion

The MeTraTim house represents a unique and innovative approach to system-built housing in the UK. With their distinctive architectural features and robust construction, these homes offer numerous benefits to potential buyers and investors. However, it is essential to be aware of the potential hazards and risks associated with this property type and to conduct thorough inspections to ensure compliance with the Defective Premises Act. By following the inspection tips and maintenance guidelines outlined in this article, you can safeguard your investment and enjoy the many advantages of owning a MeTraTim house.

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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