Part of the Retrofit series
Secondary glazing is a method used to reduce heat loss and draughts through windows in homes. It involves adding a layer of glazing to existing windows, which can be either temporary or semi-permanent.
Temporary secondary glazing typically involves attaching a clear acrylic plastic or clear polystyrene sheet to the window frame using methods such as magnetic strips, Velcro-like material, or ‘clip and stick’ systems using uPVC edging. These options are relatively cost-effective and can be installed or removed as needed, making them suitable for DIY projects. They can also help reduce noise transmission.
Semi-permanent secondary glazing options are more durable and often made of heavier materials like glass. They are typically fixed in place using screws, strong adhesive, or sealant. Some semi-permanent options allow windows to slide open on tracks, retaining the functionality of the original windows. However, these options are not generally suitable for DIY installation and may require professional help.
Secondary glazing can be a practical solution for homeowners who cannot replace their old single-glazed windows with double-glazing, either due to cost constraints or because of preservation regulations in listed buildings or conservation areas. By reducing heat loss and draughts, secondary glazing helps improve energy efficiency and comfort levels within the home. However, it’s essential to check regulations before installing secondary glazing in listed buildings to ensure compliance with preservation guidelines.
Secondary glazing options vary in terms of cost, complexity, and permanence, providing homeowners with choices based on their needs and budget.
- Transparent Film Secondary Glazing: This is the simplest and most affordable option. It involves applying a thin transparent plastic film to the window frame using double-sided sticky tape. The film, similar to cling film, is nearly invisible when properly installed. To apply, the tape is attached to the frame, the film is cut to size and attached to the tape, and then hot air from a hairdryer is used to shrink the film and create a tight seal. While cost-effective and easy to install, this option may damage paintwork and is typically temporary.
- Temporary Secondary Glazing: This option involves attaching a rigid and transparent material, such as clear acrylic plastic or clear polystyrene, to the window frame in a manner that allows for easy removal. Various attachment methods include magnetic strips, Velcro-like material, or ‘clip and stick’ systems using uPVC edging. This type of secondary glazing helps reduce heat loss and noise, but it’s more expensive than film secondary glazing and requires a bit more effort to install.
- Semi-Permanent Secondary Glazing: This option is more durable and typically made of heavier materials like glass. It requires screwing into place or using a strong adhesive or sealant for installation. Semi-permanent secondary glazing can slide open on tracks, allowing the windows to function normally. However, this option is not suitable for DIY installation and is more costly compared to the other options.
Each type of secondary glazing serves to reduce heat loss and improve energy efficiency in homes, providing homeowners with options based on their preferences, budget, and the level of permanence desired.
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