Overview of the GLE House

The GLE house, a product of the mid-20th century, represents a unique chapter in the history of British residential architecture. Manufactured by M J Gleeson Ltd and designed by W H Sanders & Son, these properties were constructed between 1966 and 1970. With approximately 250 units built, the GLE house is a notable example of system-built housing, a method that gained popularity during the post-war period to address housing shortages.

These properties are typically found in various parts of the UK, often in suburban areas where rapid development was necessary. The GLE house is known for its distinctive construction techniques and materials, which set it apart from traditional brick-and-mortar homes. This article delves into the intricate details of the GLE house, providing valuable insights for potential buyers and investors.

Identification Characteristics

Architectural Features

The GLE house is primarily a two-storey terraced house, although some variations include flats. The architectural design includes a medium pitch gable roof covered with concrete tiles or, in some cases, a flat roof. The external walls exhibit a mix of materials, including brick, timber boarding, tile hanging, and exposed aggregate precast concrete (PC) panels.

External Walls

The front and rear walls of the GLE house are often constructed with storey-height timber frame panels. These panels are tied with galvanised mild steel (MS) ties cast into the ground floor screed. The cladding materials vary, with options including timber boarding, tile hanging, and brick facings. The gable walls are typically made of brick, with some variations featuring storey-height exposed aggregate PC panels.

Roof Structure

The roof structure of the GLE house consists of trussed timber purlins and rafters, supporting concrete tiles. In some variants, the roof may be flat, which was a common design choice during the period of construction.

Internal Walls and Floors

The internal walls include storey-height 7-inch PC panels for separating walls and honeycomb plasterboard for partitions. The ground floor is constructed with concrete, while the first floor features a 7-inch concrete slab with a cement/sand screed. Ceilings are typically made of plasterboard.

Construction Details

Substructure

The substructure of the GLE house includes concrete strip footings, brick underbuilding, and a concrete slab. A damp-proof course (DPC) is also incorporated to prevent moisture ingress.

External Walls

The external walls are a key feature of the GLE house, showcasing a combination of materials and construction techniques:

• Timber Frame Panels: The front and rear walls are constructed with storey-height timber frame panels, tied with galvanised MS ties cast into the ground floor screed.
• Cladding: The cladding materials include timber boarding, tile hanging, and brick facings. The panels are lined with foil-backed plasterboard and insulated with 1-inch glass fibre insulation between the frame studs.
• Additional Features: The walls also include hardwood sills, asbestos cement sheets, galvanised MS fixing plates, aluminium flashings, and PRC beams.

Gable Walls

The gable walls are constructed with brick, featuring a 2-inch cavity and storey-height room-sized PC panels. These panels are bedded on 1-inch dry-pack and tied together at vertical joints with loop and lacing reinforcement. Galvanised rolled steel angles (RSA) are bolted to the panels to support the trussed purlin.

Separating Walls and Partitions

The separating walls are made of storey-height 7-inch PC panels, while the partitions are constructed with honeycomb plasterboard. This combination provides structural integrity and sound insulation between rooms.

Floors

The ground floor is a concrete slab, providing a solid foundation for the property. The first floor features a 7-inch concrete slab with a cement/sand screed, ensuring durability and stability.

Roof

The roof structure includes trussed timber purlins and rafters, supporting concrete tiles. In some variants, the roof may be flat, which was a common design choice during the period of construction.

Typical Hazards and Risks

Structural Issues

One of the primary concerns with GLE houses is the potential for structural issues, particularly related to the timber frame panels and PC panels. Over time, these materials can deteriorate, leading to problems such as:

• Timber Decay: Timber frame panels are susceptible to decay, especially if exposed to moisture. This can compromise the structural integrity of the property.
• Concrete Deterioration: PC panels can suffer from issues such as carbonation and corrosion of the steel reinforcement, leading to spalling and weakening of the panels.

Asbestos

Asbestos cement sheets are used in the construction of GLE houses, posing a significant health risk if disturbed. Asbestos fibres can cause serious respiratory diseases, including asbestosis and mesothelioma.

Insulation and Energy Efficiency

The insulation in GLE houses, typically 1-inch glass fibre, may not meet modern energy efficiency standards. This can result in higher heating costs and reduced comfort for occupants.

Damp and Moisture Ingress

The presence of a damp-proof course (DPC) is essential to prevent moisture ingress. However, if the DPC is compromised or missing, it can lead to damp issues, affecting the timber frame panels and internal finishes.

Defective Premises Act

The GLE house is not explicitly classified as defective under the Defective Premises Act. However, the potential for structural issues, asbestos presence, and other hazards means that thorough inspections and assessments are crucial. Buyers and investors should be aware of these risks and take appropriate measures to address them.

Inspection and Assessment Guide

Pre-Inspection Preparation

Before conducting an inspection of a GLE house, it is essential to gather relevant information and prepare the necessary tools. This includes:

• Historical Data: Obtain historical data on the property, including construction dates, previous repairs, and any known issues.
• Inspection Tools: Ensure you have the necessary tools, such as a moisture meter, endoscope, and personal protective equipment (PPE) for asbestos inspection.

External Inspection

Roof

• Check for Damage: Inspect the roof for any signs of damage, such as missing or broken tiles, sagging, or water ingress.
• Flat Roofs: If the property has a flat roof, check for pooling water, cracks, and signs of deterioration.

Walls

• Cladding Condition: Examine the condition of the cladding materials, including timber boarding, tile hanging, and brick facings. Look for signs of decay, cracking, or detachment.
• PC Panels: Inspect the PC panels for signs of spalling, cracking, and corrosion of the steel reinforcement.

Internal Inspection

Walls and Partitions

• Structural Integrity: Check the structural integrity of the timber frame panels and PC panels. Look for signs of decay, cracking, and movement.
• Asbestos: Identify any asbestos-containing materials and ensure they are in good condition. If asbestos is suspected, arrange for a professional asbestos survey.

Floors

• Ground Floor: Inspect the ground floor for signs of damp, cracking, and movement. Use a moisture meter to check for moisture ingress.
• First Floor: Check the condition of the first-floor concrete slab and screed. Look for signs of cracking and movement.

Insulation and Energy Efficiency

• Insulation: Assess the condition and effectiveness of the insulation. Consider upgrading to modern insulation materials if necessary.
• Energy Efficiency: Evaluate the overall energy efficiency of the property, including windows, doors, and heating systems.

Additional Considerations

Damp-Proof Course (DPC)

• Check DPC: Ensure the DPC is intact and functioning correctly. Look for signs of rising damp and moisture ingress.

Services

• Plumbing and Electrical: Inspect the plumbing and electrical systems for any signs of wear, damage, or outdated components. Ensure they meet current safety standards.

Typical Defects and Maintenance

Common Defects

Timber Decay

Timber frame panels are prone to decay, especially if exposed to moisture. Regular inspections and maintenance are essential to prevent and address timber decay.

Concrete Deterioration

PC panels can suffer from carbonation and corrosion of the steel reinforcement, leading to spalling and weakening of the panels. Regular inspections and repairs are necessary to maintain the structural integrity of the property.

Asbestos

Asbestos-containing materials pose a significant health risk if disturbed. It is essential to identify and manage asbestos materials safely, following appropriate regulations and guidelines.

Maintenance Tips

Regular Inspections

Conduct regular inspections of the property to identify and address any issues promptly. This includes checking the condition of the roof, walls, floors, and services.

Moisture Control

Ensure effective moisture control measures are in place, including a functioning DPC and proper ventilation. Address any signs of damp or moisture ingress promptly.

Energy Efficiency Upgrades

Consider upgrading the insulation and energy efficiency of the property to meet modern standards. This can improve comfort and reduce heating costs.

Conclusion

The GLE house, with its unique construction techniques and materials, offers a fascinating glimpse into the history of British residential architecture. However, potential buyers and investors must be aware of the typical hazards and risks associated with these properties. Thorough inspections and assessments are crucial to identify and address any issues, ensuring the safety and longevity of the property.

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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