How do liquid roofing membranes work?

Liquid roofing membranes are a very effective and practical waterproofing solution.. Because it is applied in liquid form to the ceiling surface. Thus, it can be used effectively on complex shaped roofs.

When drying, it forms a continuous, elastic layer.. These membranes are used to protect the roof from leaks and damage from weather or other external influences.

When a liquid membrane is applied to different roofing materials, its behavior can be different. Therefore, we mention what type of liquid membrane is most effective for each type of roofing material.

Which liquid membranes are most effective depending on the roofing material?

The roof of the house can be made of concrete, metal or wood. Depending on this material and shape, one or the other type of liquid membrane should be used.

metal roof

Liquid membranes are compatible with metal roofs such as sheet steel or aluminum. They stick to the metal and form a waterproof barrier that protects against corrosion and water ingress. In addition, they can help reduce the thermal expansion and contraction of the metal, which contributes to the durability of the roof.

For a metal roof, a silicone liquid membrane is an ideal liquid membrane option. This type of membrane offers several advantages for sealing and protecting metal roofs.

The main reasons for this choice are:

resistance to the elements

Silicone membranes are extremely resistant to the elements such as sunlight, rain, wind and temperature fluctuations. However, these conditions can be detrimental to metal roofs membrane and silicone Provides a durable and resilient barrier against these elements.


Silicone membranes are very elastic, making them ideal for metal roofs that can Experience thermal movement and expansion. The resiliency of the membrane allows it to accommodate metal movement without cracking or delaminating, helping to maintain seal integrity.

corrosion protection

Metal roofs can be subject to corrosion due to moisture and other environmental influences. The silicone membrane forms an impermeable layer and effectively protects the metal from moisture, preventing corrosion and premature failure.

UV resistance

Silicone membranes are highly resistant to UV rays, helping to protect metal roofs from sun damage. Thanks to this, the aesthetic appearance of the ceiling is preserved and its service life is extended.

concrete ceilings

read Liquid membranes can be applied to concrete surfacesThis creates an impermeable layer that prevents water penetration and protects against moisture damage. They can also help improve the wear resistance and durability of concrete roofs.

For a concrete roof, a polyurethane membrane is an ideal liquid membrane option. This type of liquid membrane is highly recommended for its properties Distinctive features and advantages of concrete roofs.

Its properties include the following:


Polyurethane membranes have excellent adhesion to concrete. They effectively adhere to the concrete roof surface, forming a continuous, impermeable layer that protects against moisture and penetration.


Polyurethane membranes are very flexible and elastic. This is especially useful for concrete roofs, as concrete can do this Movement and cracking occur due to temperature fluctuations and structural stresses. The elasticity of the membrane allows it to accommodate these movements without compromising the integrity of the seal.

UV resistance

Polyurethane has good resistance to ultraviolet (UV) rays. This is important for roofs exposed to the sun as it prevents premature damage and cracking of the material.


Polyurethane membranes are known for their durability and resistance to harsh environmental conditions. They withstand extreme climatic conditions, resist exposure to chemicals and retain their physical properties over time.

Likewise, it is important to follow the manufacturer’s instructions and apply the polyurethane membrane according to the specific recommendations for best results when waterproofing a concrete roof.

The important thing is to consult one professional waterproofing. So we don’t risk it on the roof of our house.

shingles or asphalt shingles

Liquid membranes can bond and seal roof shingles, providing an extra layer of protection against moisture and seepage. They can also help extend the life of shingles by preventing it from getting worse prematurely.

The most effective type of liquid membrane is the same as for a concrete roof.

wooden roofs

With wooden ceilings, liquid membranes can penetrate through the pores of the wood and form a protective layer that seals and protects against moisture. who helps prevent the destruction of the wood and the formation of mold.

For a wooden roof, a polyurethane membrane is an ideal option for a liquid membrane. This type of liquid membrane offers several advantages for waterproofing and protecting wooden roofs.

Because of this, this is a recommended option:

penetration into the wood

The polyurethane membrane has the ability to penetrate the pores of the wood and form a protective layer inside. This seals the wood and protects it from moisture and water damage.


Polyurethane membranes are very flexible and elastic, which allows them to adapt to the natural movements of the wood due to changes in temperature and humidity. This flexibility prevents the membrane from tearing or detaching, providing long-lasting protection.

UV resistance

Polyurethane has good resistance to ultraviolet (UV) rays, which helps protect wood from sun damage. This is particularly important for wooden roofs that are exposed to atmospheric influences.

moisture resistance

The polyurethane membrane forms an effective and waterproof barrier against moisture and prevents water from penetrating the wood. This helps prevent wood rot, mold, and other moisture-related problems.

It is important to follow the manufacturer’s recommendations and specific instructions for applying the polyurethane membrane to wooden ceilings. In addition, the help of trained professionals Ensuring a correct and efficient installation respecting the characteristics of the wood and its proper care.

What happens to high-traffic terraces? Do you need a special liquid membrane to seal your surface?

Heavily frequented terraces

For heavy traffic decks, the use of liquid membranes, which are specifically designed to carry heavy loads and withstand the wear and tear of constant traffic, is recommended. A suitable option in this case would be the aliphatic polyurethane liquid membrane.

Aliphatic polyurethane is a variant of polyurethane characterized by high resistance to UV rays and high durability.. It has excellent resistance to wear, abrasion and heavy foot traffic.

The Aliphatic polyurethane liquid membrane Forms a strong, resilient protective layer that withstands heavy traffic without cracking or peeling. In addition, it offers excellent resistance to atmospheric agents, chemicals and aggressive substances.

When selecting an aliphatic polyurethane liquid deck membrane for a heavy-duty deck, it is important to ensure you follow the manufacturer’s recommendations and instructions for surface preparation and proper application. In addition, it is advisable to take the help of trained professionals to ensure a correct and permanent installation.

Other types of liquid roofing membrane

There are different types of liquid roofing membranes on the market. So far we have mentioned liquid polyurethane membranes and liquid silicone membranes.

Acrylic liquid membranes

Acrylic liquid membranes are also a good alternative for roof waterproofing, for example. However, because they are based on acrylic polymers, they are not as flexible as those based on polyurethane.

Because of this difference in chemical composition, it is used in Roofs are less exposed to extreme climatic conditions. This is because they are not as effective against UV damage.

However, acrylic liquid membranes are only applied in one layer. While polyurethane liquid membranes must be applied in multiple layers, a minimum drying time must be observed between each application.

Butyl rubber liquid diaphragms

Another type of liquid membrane that we haven’t mentioned yet is the butyl rubber liquid membrane. It is one of the most effective roof waterproofing solutions.

Due to its chemical composition, its price is much higher than others. Make the finished work last longer. mainly because Offers more flexibility and elasticityone more high resistance to a wide range of chemicalsincluding acids, bases and solvents.

This makes them suitable for installations where exposure to harsh chemicals is expected.

Prices for liquid membranes for roof waterproofing

Liquid roofing membrane prices can vary depending on a number of factors including membrane type, brand and quantity required. In addition, prices may fluctuate over time due to fluctuations in supply and demand.

For this reason, it is wise to obtain accurate and up-to-date quotes for your home’s roofing. It is also important to consider the costs associated with the raw material, such as the labor costs required to prepare the surface and apply the liquid membrane.