Understanding thermal bridges can help you to strengthen your building’s insulation and minimise heat loss.

When insulating your home, you may hear the term thermal bridge, or cold bridge, thrown around a lot.

Thermal bridges are generally considered bad, so it’s important to understand what one is, so that you can minimise the risk of thermal bridges occurring in your home.

A thermal bridge is a weak point in your building’s insulation that causes heat loss. They are usually caused by a gap or hole in building materials, but also occur at areas made from highly conductive materials like wood, metal and steel.

As well as causing heat loss, thermal bridges can also cause condensation, mould and damp problems.

Types of thermal bridge

Construction– Construction thermal bridges are caused by a piece of construction material or a gap that runs through the building’s insulation.

Geometric– Geometric thermal bridges aren’t formed by physical materials or gaps; they can occur even when insulation is continuous. They are caused when the geometry of the thermal envelope causes increased heat loss and can be either two or three-dimensional.

Combined– Often thermal bridges will combine elements of both construction and geometric thermal bridging.

Repeating– This type of thermal bridge repeats at regular intervals throughout the thermal envelope. Examples of areas where repeating thermal bridges may occur include ceiling joists, ground floor joists, and steel wall ties.

Non-repeating– These are usually one-off thermal bridges caused by discontinuities. Examples include gaps around windows and doors or in internal wall or floor junctions.

Spray insulation is an excellent material for improving thermal insulation as it moulds to the shape of your building, effectively filling and sealing any holes or gaps in your building materials.

For more information about spray foam insulation, or to book a free consultation, give our team here at Metropolitan Insulation a call on 0800 028 4042.