Window roller shutters

[edit] Introduction

Window roller shutters are coverings fitted over windows to provide varying levels of security, privacy, light control and weather protection. They are commonly used in residential, commercial and industrial buildings. Depending on their design, materials and installation, they can also improve thermal performance and reduce the transmission of external noise.

A typical roller shutter consists of interlocking slats that move vertically within guide rails and coil around a barrel housed above the window opening. Shutters may be operated manually or by an electric motor. Their performance depends on the construction of the shutter, the quality of the installation, the characteristics of the window and the requirements of the building.

[edit] Benefits of window roller shutters

[edit] Security and protection

Roller shutters can provide a physical barrier that makes unauthorised access through a window more difficult. The level of protection depends on the strength and thickness of the slats, the guide rails, the locking mechanism, the fixings and the supporting structure. A shutter should be selected according to the security risks and any applicable performance requirements; not all roller shutters are designed or tested to provide a specified level of resistance to forced entry.

External shutters can also provide some protection against wind-driven rain, airborne debris and other environmental conditions. However, their ability to withstand severe weather depends on their design, installation and rated performance. They should not be assumed to provide storm protection unless they have been specifically designed and tested for that purpose.

[edit] Thermal performance and noise reduction

Closed roller shutters can reduce heat transfer through windows by creating an additional layer and an air space between the shutter and the glazing. Insulated slats and well-designed installations can improve this effect, although the degree of improvement varies according to the shutter construction, airtightness, window performance and surrounding conditions. Roller shutters do not replace the need for suitable glazing and effective insulation elsewhere in the building.

Shutters may also reduce the transmission of external noise, particularly when they incorporate insulated slats and minimise gaps around the opening. The degree of noise reduction depends on the complete window and shutter assembly, including the seals, installation details and sound characteristics of the noise source.

[edit] Privacy and light control

Roller shutters can substantially restrict visibility through a window when fully closed. They also provide effective control over daylight, ranging from partial shading to near-total light exclusion, depending on the slat design and gaps between components. This can be useful in bedrooms, offices, healthcare facilities and other spaces where privacy or light management is important.

[edit] Types of window roller shutters

[edit] Manual and electric shutters

Manual roller shutters are operated using a mechanism such as a winding handle, strap or spring-assisted system. They may be suitable for smaller windows or installations where powered operation is unnecessary.

Electric roller shutters use a motor to raise and lower the curtain, typically controlled by a wall switch, remote control or building control system. Powered systems can be more convenient for large or frequently operated shutters. Their design should incorporate appropriate safety measures to prevent injury or damage during operation, including protection against crushing and entrapment where necessary.

[edit] Integrated and externally mounted shutters

Integrated roller shutters are incorporated into the window assembly or surrounding building fabric. Depending on the system, the shutter box may be concealed within the wall, lintel or window head, providing a relatively unobtrusive appearance. These systems are generally easier to accommodate when designed into a new building or major refurbishment.

Externally mounted roller shutters are fitted to the outside face of the building, either over the window opening or within a purpose-designed recess. They can be installed as part of a retrofit, subject to suitable fixings and adequate space for the shutter box and guide rails. Their appearance, effect on the façade and exposure to weather should be considered during specification.

[edit] Materials and construction

Roller shutter slats are commonly manufactured from aluminium or steel. Aluminium is relatively lightweight and resistant to corrosion, while steel can provide greater strength for a given profile, depending on its thickness and construction. Protective coatings and suitable maintenance are important for both materials.

Slats may be solid, perforated or designed with an insulating core. Solid slats provide greater visual screening, while perforated slats allow some light and air to pass through. Insulated slats can improve thermal and acoustic performance compared with uninsulated alternatives, although the performance of the complete installation depends on the joints, guide rails, seals and shutter box.

[edit] Installation and maintenance

[edit] Installation considerations

Correct installation is necessary to ensure that a roller shutter operates reliably and performs as intended. Before installation, the window opening should be measured and the supporting structure assessed to establish suitable fixing points. The available headroom, position of the shutter box, alignment of the guide rails and access for maintenance should also be considered.

Powered systems require appropriate electrical connections, controls and safety devices. Installation and commissioning should follow the manufacturer's instructions and applicable regulations. Where shutters are fitted to existing buildings, the work should also take account of the façade, window condition, weatherproofing and any relevant planning or conservation requirements.

[edit] Inspection and maintenance

Regular inspection and maintenance can help extend the service life of a roller shutter and reduce the risk of operational failure. Maintenance should follow the manufacturer's instructions and take account of the shutter's operating frequency, exposure and environment.

Typical tasks include removing accumulated dirt and debris, checking the curtain and guide rails for damage or obstruction, inspecting fixings and locks, and checking the operation of the motor and controls where fitted. Lubrication should be carried out only where recommended for the particular system. Defects such as unusual noise, uneven movement, damaged slats or unreliable controls should be investigated promptly. Powered shutters should be isolated from their energy supply before maintenance where required, and repairs should be undertaken by suitably competent personnel.

[edit] Related articles on Designing Buildings

• Shutter
• Types of shutters
• A Detailed Overview of Shop Front Roller Shutter Solutions in London
• A Step-by-Step Guide to Roller Shutter Installation
• Structural and Installation Frameworks of Modern Roller Shutter Doors
• Fire rated roller shutter doors
• Emergency roller shutter repair
• How Electric Roller Shutters Improve Security for Modern Commercial Spaces?