At KALK A/S all of our products are cement free and we build new houses and repair existing masonry with lime mortar. Read about the benefits of working with lime below:
1. It is flexible and can cooperate with the rest of the building
If you're using a lime mortar you'll get - in contrast to cement-based mortars - a flexible masonry that will cooperate with the rest of the house. This means that the mortar joint is able to adapt to shifting ground or other changing conditions, which will make it easier to avoid cracks in the adherence zone as well as in the plastering. In addition to the required compressive strength, it also has a great tensile strength. The flexibility of the lime mortar is particularly important when renovating older buildings.
2. It's capillary open
A capillary open masonry is a masonry with a breathable wall that will allow moisture to freely move through it and evaporate from its surface. This will create a house with a self-regulating indoor environment. Furthermore, you'll have fewer problems with moisture and mold in the building.
3. You'll avoid the use of expansion joints
The need for expansion joints in the brickwork can be avoided when using lime mortars. If the wall doesn't have the possibility to absorb vibration and to allow building movement, the adherence zone will start to crack over time. To ensure that this won't happen, you can use an expansion joint. An expansion joint is a mid-structure seperation causing the wall on each side of the joint to be able to move and, therefore, it relieves stress on the building materials. Using lime mortar there's no need for expansion joints - which is often the case when using cement-based mortar - because lime mortars are flexible themselves.
4. It's easily recycled
By decomposition it's easy to separate bricks and mortar again. Therefore, it's possible to recycle both parts and reuse them in new masonry constructions or renovation of existing ones. At KALK A/S we are currently in the process of getting a C2C certification of our entire product line, so our products eventually will be part of a closed cycle in which all the materials will be recycled.
5. It's easy to work with
Lime mortars are easy to work with, which makes it easier to achieve a better result.
6. It's sustainable and environmentally friendly
The CO2 that is released from the lime when it's burned is reabsorbed when the lime hardens. For the actual production of lime-based mortars, the impact of the CO2 is less damaging than when producing cement-based mortars. This is because it's necessary to burn the lime at between 1400 - 1600 degrees when making cement, while it's only necessary to burn the lime at temperatures between 900 - 1200 degrees when producing lime based mortars.