When it comes to waterproofing a surface, using a liquid membrane is a popular choice. Liquid membranes are easy to apply and provide an effective barrier against moisture. However, when it comes to applying mortar over a waterproofing liquid membrane, there are a few factors to consider. In this article, we will explore whether it is possible to apply mortar directly over a waterproofing liquid membrane and discuss the potential implications of doing so.
Understanding Waterproofing Liquid Membrane
Before diving into the topic at hand, let’s briefly understand what a waterproofing liquid membrane is. A liquid membrane is a type of coating that is applied in liquid form directly to a surface, creating a seamless and continuous waterproof barrier. These membranes are usually made of elastomeric or acrylic materials and are widely used in waterproofing applications such as roofs, balconies, basements, and other areas prone to water exposure.
The Purpose of Mortar
Mortar is a mixture of cement, sand, and water used for a wide range of purposes in construction, including bonding bricks or stones together, filling gaps, and covering surfaces. When it comes to applying mortar over a surface, it is typically done to create a durable and aesthetically pleasing finish. However, the decision to apply mortar over a waterproofing liquid membrane requires careful consideration.
Adhesion Issues
One of the key challenges of applying mortar directly over a waterproofing liquid membrane is adhesion. Mortar is meant to adhere to a surface, and the adhesion strength is crucial for its durability. Liquid membranes are designed to be smooth and have a low porosity, which can make it difficult for mortar to bond properly. The smooth surface of the liquid membrane does not provide a suitable substrate for the mortar to grip onto, potentially leading to poor adhesion.
Flexibility and Movement
Another factor to consider is the flexibility of the waterproofing liquid membrane and the subsequent movement it can undergo. Liquid membranes are designed to withstand the expansion and contraction of the underlying surfaces, which helps prevent cracks and leaks. Applying mortar directly over the liquid membrane may restrict its ability to flex, resulting in cracks and damage to both the membrane and the mortar. This can compromise the integrity of the waterproofing system and lead to water infiltration.
Alternative Approaches
While applying mortar directly over a liquid membrane may not be the best approach, there are alternative methods to achieve the desired outcome. One option is to use a mesh reinforcement system. This involves embedding a mesh into the liquid membrane before it cures, providing a rough surface for the mortar to adhere to. Additionally, using a separate bonding agent or primer specifically designed for mortar adhesion can also help enhance the bond between the liquid membrane and the mortar.
It is generally not recommended to apply mortar directly over a waterproofing liquid membrane. The smooth surface and low porosity of the liquid membrane can hinder proper adhesion and restrict flexibility, leading to potential damage and compromised waterproofing. However, alternative approaches such as using a mesh reinforcement system or applying a bonding agent can help overcome these challenges and achieve a durable and aesthetically pleasing finish. To ensure the success of the project, it is always best to consult with a professional waterproofing contractor who can provide expert guidance based on the specific application and requirements.