TRADA Type II Houses: A Comprehensive Guide for UK Home Buyers and Investors

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Understanding the TRADA Type II House

The TRADA Type II house, a distinctive system-built property, emerged during the 1970s as part of the UK’s post-war housing boom. Designed by the Timber Research and Development Association (TRADA), these homes were constructed between 1970 and 1975, with approximately 2,000 units built. Known for their unique construction methods and materials, TRADA Type II houses are primarily found in suburban areas across the UK. This article delves into the intricacies of these properties, offering valuable insights for potential buyers and investors.

Historical Context and Manufacturers

The TRADA Type II house was developed in response to the urgent need for affordable housing in the UK during the 1970s. The Timber Research and Development Association, a leading authority in timber construction, spearheaded the design and development of these homes. The association’s expertise in timber technology was instrumental in creating a cost-effective and efficient housing solution. The TRADA Type II house was manufactured by various construction companies, each adhering to the association’s specifications to ensure consistency and quality.

Typical Characteristics of TRADA Type II Houses

TRADA Type II houses are typically two-storey semi-detached or terraced homes. They feature a medium pitch gable roof covered with concrete tiles, providing a robust and weather-resistant structure. The external walls are often constructed entirely of brick or a combination of brick on the ground floor and tile hanging on the upper storey. A flat canopy over the front door is a common architectural feature, adding to the property’s aesthetic appeal.

Construction Details

The construction of TRADA Type II houses is characterized by several key elements:

  • Substructure: These homes are built on concrete strip footings with a brick under-building and a damp-proof course (DPC) to prevent moisture ingress.

  • External Walls: The platform frame construction consists of storey-height timber frame panels sheathed externally with plywood, overlaid with building paper, and separately clad with brick. The walls are lined with plasterboard backed with a polyethylene vapour control layer, and paper-laminated mineral fibre insulation is placed between the frame studs.

  • Separating Wall: A timber frame cavity wall lined with two layers of plasterboard provides sound insulation between adjoining properties. Mineral fibre insulation is used between the frame studs and within the cavity.

  • Partitions: Internal partitions are made of timber stud lined with plasterboard, offering flexibility in interior design.

  • Floors: The ground floor is typically concrete, while the first floor features tongue-and-groove boarding on timber joists.

  • Ceilings: Plasterboard ceilings are standard, providing a smooth finish.

  • Roof: The roof structure comprises timber trusses, bituminous felt, and concrete tiles, with mineral fibre insulation at ceiling level to enhance thermal efficiency.

Variants and Alternative Names

TRADA Type II houses are sometimes referred to simply as TRADA houses. Variants of this property type include homes with upper storey front and rear external walls separately clad with tile hanging on timber battens over bituminous felt. Some partitions may also be constructed using honeycomb plasterboard, offering an alternative to traditional plasterboard partitions.

Typical Hazards and Risks

While TRADA Type II houses offer several advantages, they also present certain hazards and risks that potential buyers should be aware of:

  • Sagging Roof Ridge and Eaves Spread: Over time, the roof ridge may sag, and the eaves may spread due to the weight of the concrete tiles and the natural movement of the timber trusses.

  • Bowing Brickwork: The external brickwork may bow, particularly if the wall ties are insufficient or have deteriorated.

  • Lack of Wall Ties: Inadequate wall ties can lead to structural instability, making it essential to inspect and address this issue during a survey.

  • Localised Decay of Window Sub-Frames: Timber window sub-frames may suffer from localised decay, particularly if not properly maintained or exposed to moisture.

Defective Premises Act Considerations

Under the Defective Premises Act, properties must be constructed to a reasonable standard to ensure the safety and well-being of occupants. While TRADA Type II houses are not inherently classified as defective, potential buyers should be vigilant in assessing the condition of the property. A thorough survey can identify any defects or issues that may require attention to comply with the Act’s requirements.

Inspection Tips for TRADA Type II Houses

When inspecting a TRADA Type II house, consider the following steps to ensure a comprehensive assessment:

  1. Roof Inspection: Examine the roof for signs of sagging or eaves spread. Check the condition of the concrete tiles and bituminous felt for any damage or wear.

  2. Wall Assessment: Inspect the external brickwork for bowing or cracking. Verify the presence and condition of wall ties to ensure structural stability.

  3. Window Examination: Check the timber window sub-frames for signs of decay or rot. Ensure that the frames are properly sealed to prevent moisture ingress.

  4. Insulation and Vapour Control: Assess the condition of the mineral fibre insulation and polyethylene vapour control layer within the walls. Ensure that these components are intact and functioning effectively.

  5. Internal Partitions: Evaluate the condition of internal partitions, particularly if honeycomb plasterboard is used. Look for any signs of damage or deterioration.

  6. Floor and Ceiling Check: Inspect the ground and first floors for any signs of movement or damage. Ensure that the plasterboard ceilings are in good condition and free from cracks.

  7. Compliance with Building Regulations: Verify that the property complies with current building regulations, particularly in terms of thermal efficiency and structural integrity.

Common Defects in TRADA Type II Houses

Despite their robust construction, TRADA Type II houses may exhibit certain common defects:

  • Timber Decay: Timber components, such as window sub-frames and roof trusses, may be susceptible to decay if not properly maintained.

  • Insulation Degradation: Over time, mineral fibre insulation may degrade, reducing its effectiveness in maintaining thermal efficiency.

  • Moisture Ingress: Inadequate sealing or maintenance can lead to moisture ingress, particularly around windows and doors.

  • Structural Movement: Natural movement of the timber frame may result in minor structural issues, such as cracking or bowing of walls.

Maintenance and Repair Recommendations

To maintain the integrity and value of a TRADA Type II house, consider the following maintenance and repair recommendations:

  • Regular Inspections: Conduct regular inspections of the roof, walls, and timber components to identify and address any issues promptly.

  • Timber Treatment: Apply appropriate treatments to timber components to prevent decay and extend their lifespan.

  • Insulation Upgrades: Consider upgrading the insulation to modern standards to enhance thermal efficiency and reduce energy costs.

  • Moisture Management: Ensure that all windows, doors, and external joints are properly sealed to prevent moisture ingress.

  • Structural Reinforcement: If necessary, reinforce structural elements, such as wall ties and roof trusses, to ensure long-term stability.

Investment Potential and Market Considerations

TRADA Type II houses offer a unique investment opportunity due to their distinctive construction and historical significance. When considering a purchase, evaluate the following market factors:

  • Location: The location of the property can significantly impact its value and desirability. Properties in well-connected suburban areas are likely to attract higher demand.

  • Condition: The condition of the property is a critical factor in determining its market value. Well-maintained homes with minimal defects are more attractive to buyers and investors.

  • Historical Appeal: The historical significance of TRADA Type II houses may appeal to certain buyers, particularly those interested in architectural heritage.

  • Renovation Potential: Consider the potential for renovation or modernisation to enhance the property’s value and appeal.

Conclusion

TRADA Type II houses represent a unique chapter in the UK’s architectural history, offering both challenges and opportunities for home buyers and investors. By understanding the construction details, typical characteristics, and potential hazards of these properties, you can make informed decisions and safeguard your investment. A thorough inspection and proactive maintenance can ensure the long-term value and safety of your TRADA Type II 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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