What are Thermal Bridges (Cold Bridges)?
Awareness of thermal bridges is essential in retrofit projects incorporating fabric measures like insulation, windows, or doors, as neglecting them can result in significant heat loss at junctions, potentially up to 30%, and elevate the risk of mold and condensation due to the lack of continuous insulation in exposed areas.
When incorporating fabric measures like insulation, windows, or doors in a retrofit project, it’s crucial to be aware of thermal bridges, also known as cold bridges.
What are thermal bridges?
These are areas where heat easily escapes through a building, typically found at junctions, interfaces, and connections between construction components. Lack of continuous insulation in these exposed areas can result in an unsealed building, allowing heat to escape.
Neglecting thermal bridges can lead to substantial heat losses at junctions, potentially up to 30%. Beyond heat loss, the contrast between warm and cold junctions increases the risk of mould and condensation in your home.
How should insulation be approached in complex areas like window reveals?
In complex interfaces and junctions, such as window reveals, it’s essential to use thicker, higher-performing insulation to avoid obstructing window openings. Multiple types of insulation may be necessary to ensure a continuous wrap around the property.
What is the importance of appropriate tapings and fixings in insulation installation?
For effective insulation, it’s necessary to include all appropriate tapings and fixings to secure it firmly in place, creating an uninterrupted and continuous layer.
What are repeating and non-repeating thermal bridges?
Non-repeating linear thermal bridges occur where building components intersect, such as junctions between walls and roofs. Repeating linear thermal bridges involve recurring patterned areas, like mortar joints in blockwork, potentially leading to damp and mould issues.
Why can metal fixings pose a problem in repeating linear thermal bridges?
Instances where metal fixings are used to install fabric measures can create patterned areas of damp and mould due to their higher susceptibility to heat loss and moisture problems.
What is thermal bypass, and how does it contribute to heat loss?
Thermal bypass refers to how heat moves within or around a dwelling’s structure. Closed loop and open loop are the main types. Closed loop occurs within confined spaces, such as gaps between window panes, driven by natural air circulation. Open loop thermal bypass involves air movement through or around structures, like wind washing through external barriers.
How can thermal bypass be prevented in building design?
To prevent thermal bypass, designers and builders must ensure buildings are airtight, sealing gaps in the insulation layer and on both sides of it. This involves maintaining an airtight construction and shielding the insulation layer from air movement caused by wind.
Why is airtightness crucial in building design?
Airtightness is crucial for controlling temperature, moisture, sound, and energy use in a building, providing a more comfortable and efficient living space. Designs and specifications should aim to prevent thermal bypass by creating a continuous, airtight seal around the building envelope. Specific methods to mitigate thermal bypass will be tailored to each project’s unique requirements.
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