Historical Context and Origins

The Stewart & Partners Type I house is a notable example of early 20th-century British architecture, specifically from the 1920s. These properties were primarily constructed by Stewart & Partners Ltd, a company renowned for its innovative approach to housing during that era. The 1920s was a period marked by a significant demand for affordable housing, driven by the aftermath of World War I and the need to accommodate a growing population. Stewart & Partners Ltd responded to this demand by designing and manufacturing the Type I house, which quickly became a popular choice for many families.

Typical Locations and Distribution

The Stewart & Partners Type I houses are predominantly found in suburban areas across the UK. These properties were often built in newly developed residential zones, providing a balance between urban convenience and suburban tranquility. While exact numbers of these houses are not readily available, their presence is still notable in various parts of the country, particularly in regions that experienced rapid urban expansion during the 1920s.

Architectural and Structural Characteristics

External Features

One of the most distinguishing features of the Stewart & Partners Type I house is its 2-storey semi-detached design. These houses typically feature a medium pitch hipped roof covered with tiles, which not only adds to their aesthetic appeal but also provides effective water drainage. The external walls are rendered throughout, giving the houses a uniform and clean appearance.

Internal Structure

The internal structure of these houses is characterized by the use of Precast Reinforced Concrete (PRC) columns and panels. The external walls are constructed using hollow PRC columns built up in sections, dense aggregate ribbed PRC panels, and clinker ribbed PRC panels. Additionally, RC ring beams are present at the first floor and eaves level, providing structural integrity and support.

Substructure and Foundations

The substructure of the Stewart & Partners Type I house consists of concrete strip footings and concrete under-building. A Damp Proof Course (DPC) is also incorporated to prevent moisture from rising through the walls, which is a common issue in older properties.

Potential Hazards and Risks

Structural Concerns

One of the primary concerns with the Stewart & Partners Type I house is the durability of the reinforced concrete used in its construction. Over time, the steel reinforcement within the concrete can corrode, leading to structural weaknesses. This is particularly problematic in properties that have not been adequately maintained or have been exposed to harsh environmental conditions.

Carbonation and Corrosion

Carbonation is a natural process that occurs when carbon dioxide from the air penetrates the concrete and reacts with the calcium hydroxide to form calcium carbonate. This process can lower the pH of the concrete, making the steel reinforcement more susceptible to corrosion. The corrosion of steel in concrete is a significant issue, as it can lead to cracking, spalling, and ultimately, structural failure.

Defective Premises Act

The Stewart & Partners Type I house is not specifically classified as defective under the Defective Premises Act. However, given the potential issues with reinforced concrete durability, it is crucial for prospective buyers and investors to conduct thorough inspections and assessments before making a purchase.

Inspection and Assessment Guide

Pre-Inspection Preparation

Before conducting an inspection of a Stewart & Partners Type I house, it is essential to gather relevant information and reference materials. Key documents include the Moir Report and various BRE (Building Research Establishment) digests and reports on reinforced concrete durability, such as:

• Corrosion of steel in concrete (BRE Digest 444, Parts 1–3)
• Repair and maintenance of reinforced concrete (BR 254)
• Carbonation depths in structural-quality concrete (BR 19)

External Inspection

Roof

Inspect the roof for any signs of damage or wear, such as missing or broken tiles. Check the condition of the hipped roof structure and ensure that it provides adequate water drainage.

Walls

Examine the external walls for cracks, spalling, or other signs of deterioration. Pay particular attention to the PRC columns and panels, as these are critical components of the house’s structural integrity.

Internal Inspection

Substructure

Inspect the concrete strip footings and under-building for any signs of settlement or movement. Check the condition of the DPC to ensure that it is effectively preventing moisture ingress.

Internal Walls and Partitions

While specific details about the internal walls and partitions of the Stewart & Partners Type I house are not well-documented, it is essential to inspect these areas for any signs of structural issues or damage.

Floors and Ceilings

Similarly, the construction details of the ground and first floors, as well as the ceilings, are not well-known. However, it is crucial to inspect these areas for any signs of damage, such as sagging, cracking, or water damage.

Common Defects and Maintenance Tips

Concrete Deterioration

As previously mentioned, the primary concern with the Stewart & Partners Type I house is the potential for concrete deterioration due to carbonation and corrosion. Regular inspections and maintenance are essential to identify and address any issues early on.

Moisture Ingress

Moisture ingress can lead to a range of problems, including dampness, mould growth, and structural damage. Ensure that the DPC is in good condition and that the property has adequate drainage systems in place to prevent water from accumulating around the foundations.

Roof Maintenance

Regularly inspect and maintain the roof to prevent leaks and water damage. Replace any missing or damaged tiles promptly and ensure that the roof structure is in good condition.

Conclusion

The Stewart & Partners Type I house is a unique and historically significant property type that offers a range of benefits and challenges for home buyers and investors. By understanding the typical characteristics, potential hazards, and maintenance requirements of these houses, you can make informed decisions and ensure that your investment is well-protected.

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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