A variety of factors can lead to the development of frost attack on healthy mortar and bricks. One of these is moisture saturation, which can cause the water to freeze and expand. This happens when the temperature gets extremely low. The frost damage can weaken the bricks after it has thawed, and this can lead to the formation of large gaps and the splintered look that the damaged bricks have. This can be prevented by using frost-resistant materials and by properly constructing outer and boundary walls.

Most people think that all types of bricks are frost resistant. This is because they are exposed to the elements, and in the UK there are frosts throughout the winter. There are many types of bricks that have different characteristics and properties. They may not be frost resistant, so the question arises as to whether they are all frost resistant. There are different types of bricks, and engineering bricks are known to be frost resistant. Class A and B are also frost-resistant, although the former is more common in low temperatures. On the other hand, facing bricks are quite resistant, although the common types do not have such resistance.

Different Frost Resistant Ratings

Bricks are rated for toughness. As a result, bricks will be divided into three groups:


  • F1 – These materials are frost-resistant and suitable for use in all sorts of exposure and construction projects.
  • F2 – These kind of bricks have a reduced frost resistance. They can stay wet and resist continual freezing and thawing. It’s feasible to use them between damp proof course (DPC) and eaves, however they should not be employed in high and exposed places. They should not be used for cills, coping, cappings, or landscaping below the DPC level.
  • F0- This signifies that bricks are not frost resistant and may only be used inside.

Is Facing Brick Freeze Resistant?

Most people will notice that facing bricks are commonly used in house building. These are available in various textures and colors and have the ability to alter the look of a building. Due to the exposure to harsh weather conditions, it is important that facing bricks are frost resistant. Usually, these are rated at F1 or F2. Most types of facing bricks have low water absorption, which helps minimize their risk of freezing and taking on water.

How To Protect Bricks From Frost

Existing walls can be retroactively treated with silicone to prevent further frost damage, and the mortar and pointing can also be maintained to minimize water infiltration. For newer constructions, frost-resistant bricks can be considered for boundary walls. These types of bricks are highly effective at preventing water from entering a building. They are also commonly used in combination with quality coping to protect walls from excessive water buildup.