Overview of the Myton House

The Myton house, a notable example of system-built properties in the UK, was manufactured by Myton Ltd. These properties were constructed between the 1940s and 1954, a period marked by a significant demand for affordable housing solutions. The Myton house, along with its variants such as the Myton-Clyde, Myton-Solway, and Solway, represents a unique chapter in the history of British housing. With approximately 8,000 units built, including other types like Dorran, Newland, and Tarran, these homes are a common sight in various parts of the UK.

Historical Context and Manufacturers

The Myton house emerged in the post-World War II era, a time when the UK faced a severe housing shortage. The government and private sector collaborated to develop quick and cost-effective housing solutions, leading to the rise of system-built properties. Myton Ltd, the manufacturer of these houses, played a crucial role in addressing the housing crisis. The design and construction of Myton houses were influenced by the need for rapid assembly and affordability, which were paramount during that period.

Typical Characteristics of Myton Houses

Identification Characteristics

Myton houses are typically bungalows or two-storey semi-detached and terraced houses. They feature medium pitch hipped or gable roofs covered with tiles or asbestos cement sheets. Bungalows, particularly the Solway variant, have shallow pitch roofs. The external walls are constructed using storey-height Precast Reinforced Concrete (PRC) panels, with PRC ring beams at the first-floor level and PRC columns at the corners and gable apex. Some dwellings also have single-storey front elevation extensions covered with copper sheets.

Construction Details

Substructure

• Concrete strip footings: These provide a stable foundation for the structure.
• Brick underbuilding: This adds an additional layer of support and insulation.
• Concrete slab: A solid base for the ground floor.
• Damp Proof Course (DPC): Essential for preventing moisture ingress.

External Walls

• PRC kerb units: These form the base of the external walls.
• Storey height PRC corner columns: Provide structural support at the corners.
• Storey height ribbed PRC cladding panels: These panels are caulked with tarred rope from the inside and connected with metal dowels.
• Timber framing lined with plasterboard: Offers internal support and a finished surface.
• Glass wool insulation: Placed between battens for thermal efficiency.
• PRC ring beams: Located at the first-floor level, these beams provide additional structural integrity.
• Asbestos cement sheets: Used at the gable apex for added durability.

Internal Walls and Partitions

• Separating walls: Made of storey-height ribbed PRC panels lined with plasterboard.
• Partitions: Timber stud walls lined with plasterboard.

Floors

• Ground floor: Concrete slab.
• First floor: Timber boarding on timber joists, with metal shoes hooked onto dowels in the PRC ring beam. Copper-based alloy strip floor bracing and tie plates are fixed to the upper surface of the joists.

Ceilings

• Plasterboard: Used throughout for a smooth finish.

Roof

• Timber joists and purlins: Provide the main structural support.
• Tiles or asbestos cement sheets: Cover the roof for weather protection.

Typical Hazards and Risks

Carbonation in PRC Panels and Ring Beams

One of the most significant issues with Myton houses is the high rate of carbonation in PRC panels and ring beams. Carbonation is a chemical reaction between carbon dioxide in the air and calcium hydroxide in the concrete, leading to the formation of calcium carbonate. This process reduces the alkalinity of the concrete, which can lead to the corrosion of embedded steel reinforcement.

Cracking, Spalling, and Rust Staining

Cracking, spalling, and rust staining are common defects in Myton houses. These issues are often a result of the carbonation process and the subsequent corrosion of steel reinforcement. Cracking can compromise the structural integrity of the property, while spalling (the breaking away of concrete) can expose the steel reinforcement to further corrosion. Rust staining is a visible sign of underlying corrosion issues.

Asbestos-Related Risks

Many Myton houses feature asbestos cement sheets in their construction. Asbestos, a hazardous material, poses significant health risks if disturbed. It is crucial to handle asbestos-containing materials with care and to seek professional advice for removal or encapsulation.

Designation as Defective Under the Defective Premises Act

Myton houses are designated as defective under the Defective Premises Act. This designation means that these properties are recognized as having inherent structural issues that can affect their safety and habitability. Buyers and investors should be aware of this designation and consider the potential costs and implications of remedial works.

Inspection Guide for Myton Houses

External Inspection

1. Roof: Check for signs of damage or wear on the tiles or asbestos cement sheets. Look for any sagging or unevenness in the roofline.
2. Walls: Inspect the PRC panels for cracks, spalling, and rust staining. Pay particular attention to the corners and gable apex where PRC columns are located.
3. Extensions: If the property has a single-storey front elevation extension, check the condition of the copper sheets and the underlying structure.

Internal Inspection

1. Walls and Partitions: Look for signs of cracking or movement in the plasterboard lining. Check for any dampness or mould, which could indicate issues with the DPC or insulation.
2. Floors: Inspect the ground floor concrete slab for cracks or unevenness. On the first floor, check the timber boarding and joists for signs of rot or damage.
3. Ceilings: Look for any sagging or cracks in the plasterboard ceilings.

Structural Elements

1. PRC Ring Beams: Check for signs of carbonation, such as rust staining or spalling. Use a carbonation depth test if necessary.
2. Timber Framing: Inspect the timber framing for signs of rot, insect infestation, or other damage.

Variants and Their Characteristics

Myton-Clyde and Myton-Solway

These variants share many characteristics with the standard Myton house but may have some differences in construction details. For example, the Myton-Solway bungalows have shallow pitch roofs, while the Myton-Clyde may feature different external wall linings or roof coverings.

Solway

The Solway variant is typically a bungalow with a shallow pitch roof. These properties may have timber roof structures and different external wall linings compared to other Myton houses.

Common Defects in Myton Houses

High Rates of Carbonation

As mentioned earlier, high rates of carbonation in PRC panels and ring beams are a significant issue. This defect can lead to the corrosion of steel reinforcement and subsequent structural problems.

Cracking and Spalling

Cracking and spalling are common defects in Myton houses. These issues can compromise the structural integrity of the property and may require extensive remedial works.

Rust Staining

Rust staining is a visible sign of underlying corrosion issues. It is essential to address the root cause of the rust staining to prevent further damage.

Asbestos-Related Issues

Asbestos-containing materials in Myton houses pose significant health risks if disturbed. It is crucial to handle these materials with care and to seek professional advice for removal or encapsulation.

Remedial Works and Maintenance

Addressing Carbonation

To address carbonation issues, it may be necessary to apply a carbonation-resistant coating to the PRC panels and ring beams. In some cases, it may be necessary to replace severely affected elements.

Repairing Cracks and Spalling

Cracks and spalling can be repaired using appropriate concrete repair techniques. It is essential to address the underlying cause of the defects, such as carbonation or moisture ingress, to prevent recurrence.

Asbestos Management

Asbestos-containing materials should be managed carefully to prevent exposure. This may involve encapsulation or removal by a licensed asbestos contractor.

Regular Maintenance

Regular maintenance is crucial to keep Myton houses in good condition. This includes inspecting the roof, walls, and structural elements for signs of damage and addressing any issues promptly.

Conclusion

The Myton house, with its unique construction and historical significance, presents both opportunities and challenges for home buyers and investors. Understanding the typical characteristics, common defects, and necessary remedial works is essential for making informed decisions. 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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