The Procol House: A Brief Overview

The Procol house, a distinctive type of system-built property, emerged in the UK during the 1960s. Designed by T Spencer & Partners and manufactured by Harrison Procol Systems Ltd, these homes are a testament to the post-war era’s innovative construction methods. As a prospective homebuyer or investor, understanding the intricacies of the Procol house is crucial for making informed decisions. This article delves into the construction, characteristics, and potential risks associated with these properties, providing a detailed guide for those considering a purchase.

Historical Context and Manufacturing Details

The Procol house was developed in response to the urgent need for affordable housing in the post-war period. The 1960s saw a surge in the construction of system-built homes, with the Procol house being a prominent example. Harrison Procol Systems Ltd, the manufacturer, collaborated with T Spencer & Partners to design these homes, which were primarily constructed in urban and suburban areas across the UK.

Typical Characteristics of Procol Houses

Procol houses are typically two-storey semi-detached or terraced homes. They feature a medium pitch gable roof covered with interlocking concrete tiles, providing a distinctive appearance. The front and rear external walls are constructed from precast (PC) exposed aggregate panels, clad with asbestos cement sheets. The gable walls are also made of exposed aggregate PC panels, offering a uniform look throughout the structure.

Construction Details

Understanding the construction of Procol houses is essential for identifying potential issues and assessing their suitability as an investment. Here is a detailed breakdown of the construction elements:

• Substructure: The foundation consists of concrete pads below stanchions, with a PC ring beam providing additional support. A damp-proof course (DPC) is included to prevent moisture ingress.

• Frame: The main frame comprises nine RS hollow box stanchions, eight RSA perimeter beams, and three RST floor and ceiling support beams. These components are protected with a red oxide paint coating to prevent corrosion.

• External Walls: The front and rear walls are made of exposed aggregate PC panels, infilled with storey-height timber frame panels. These panels incorporate doors and windows and are clad with asbestos cement sheets. The gable wall is constructed entirely of exposed aggregate PC panels, lined with woodwool slabs for insulation.

• Separating Wall: The separating wall between properties is a woodwool cavity wall filled with pea gravel, providing sound insulation and structural stability.

• Partitions: Internal partitions are made of honeycomb plasterboard, offering lightweight and flexible room divisions.

• Floors: The ground floor consists of tongue-and-groove (T&G) boarding on timber joists, while the first floor uses the same construction method.

• Ceilings: Ceilings are made of Asbestolux, a material known for its fire-resistant properties.

• Roof: The roof structure comprises timber trusses, bituminous felt, and interlocking concrete tiles, providing durability and weather resistance.

Potential Hazards and Risks

While Procol houses offer unique architectural features, they also present certain risks and hazards that buyers should be aware of:

• Asbestos: The use of asbestos cement sheets and Asbestolux in ceilings poses a significant health risk if disturbed. Proper management and removal by professionals are essential to ensure safety.

• Structural Integrity: Over time, the steel frame components may suffer from corrosion, particularly if the protective coating has deteriorated. Regular inspections are necessary to assess the condition of the frame and address any issues promptly.

• Thermal Performance: The original construction materials may not meet modern thermal performance standards, leading to higher energy costs. Retrofitting with improved insulation can enhance energy efficiency.

• Moisture Ingress: The presence of a damp-proof course helps prevent moisture ingress, but it is crucial to ensure it remains intact. Any signs of dampness should be investigated and remedied to prevent further damage.

Defective Premises Act Considerations

The Defective Premises Act 1972 aims to protect homeowners from defects in construction that could pose a risk to health and safety. While Procol houses are not specifically classified as defective under this act, the presence of asbestos and potential structural issues necessitate careful consideration. Buyers should conduct thorough surveys and seek expert advice to ensure compliance with safety standards.

Inspection Tips for Procol Houses

When inspecting a Procol house, it is essential to focus on specific areas to identify potential issues:

• Asbestos Management: Engage a qualified asbestos surveyor to assess the presence and condition of asbestos materials. Ensure any removal or encapsulation is carried out by licensed professionals.

• Structural Assessment: Inspect the steel frame for signs of corrosion or damage. Pay particular attention to the protective coating and address any areas of concern.

• Thermal Efficiency: Evaluate the insulation levels and consider upgrading to improve energy efficiency. Check for drafts and seal any gaps to enhance comfort.

• Moisture Control: Look for signs of dampness, such as mould or water stains. Ensure the damp-proof course is intact and address any issues promptly.

• Roof Condition: Examine the roof for missing or damaged tiles, and check the condition of the bituminous felt. Ensure the roof structure is sound and free from leaks.

Variants and Modifications

Over the years, some Procol houses may have undergone modifications or upgrades. Common variants include:

• Concrete Footings and Underbuilding: Some properties may feature concrete footings and underbuilding for added stability.

• Concrete Ground Floor: In certain cases, the ground floor may be constructed from concrete instead of timber joists.

• First Floor of Chipboard: Some homes may have a first floor made of chipboard rather than tongue-and-groove boarding.

Conclusion

The Procol house represents a unique chapter in the UK’s architectural history, offering both charm and challenges for homebuyers and investors. By understanding the construction details, potential risks, and inspection tips, you can make informed decisions when considering a Procol house purchase. 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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