How to waterproof a roof with an acrylic coating? A step-by-step guide.

Can it be used on roofs with non-standard shapes?

Yes, this is one of the main advantages of acrylic coatings. Application by brush or roller allows for precise coverage of hard-to-reach areas, such as under air conditioning or ventilation units. Spraying is also possible, resulting in a more even coating and a more aesthetically pleasing end result than applying with a roller.

How to properly prepare the substrate for acrylic waterproofing?

Surface preparation is a crucial step in any waterproofing application. Only a thoroughly cleaned, dried, and primed substrate will ensure a durable and airtight acrylic coating. This section will provide detailed, step-by-step instructions.

Step 1: Assess the technical condition of the roof before application

Check that the surface is stable, dry and free from corrosion, scratches and loose parts.

Step 2: Cleaning and degreasing the surface

Wash the roof mechanically, for example, with a pressure washer. Use Sulfanol A or another degreasing agent. For moss or fungi, use a biocide, such as GrzyboStop .

Step 3: Repairing cracks and chips before applying acrylic

Use compatible repair compounds, such as Jointex® , to repair damage. This compound can be used to fill holes in felt, shingles, and many other roofing materials.

Step 4: Priming the Roof

Use a suitable primer, such as Revinex for shingles or felt, Neotex® Metal Primer for metal roofs, or other compatible primers, which should be selected for each surface being protected. Primers are used to ensure optimal adhesion.

How to properly waterproof an acrylic coating?

To achieve a lasting waterproofing effect, it's important not only to prepare the surface but also to apply the product correctly. From the choice of tools, to weather conditions, to the number of coats – every detail matters. Learn how to do it step by step.

What tools will be needed to apply it?

A brush, roller , or airless sprayer. A paint stirrer, protective tape, and a detailing spatula. An additional bucket and scale may also be useful for measuring the correct amount of material.

How to mix and prepare the coating for use?

Mix the coating thoroughly for several minutes with an electric mixer at low speed. Avoid overmixing the mixture to avoid air entrapment. This could result in an unsightly end result and, in extreme cases, curing problems. Do not dilute the material unnecessarily (this information is always provided in the technical data sheet, in the "Application" tab).

How many layers of acrylic coating should be applied to the roof?

Typically, two layers are applied crosswise. Average consumption is approximately 1.5-2.5 kg/m². This depends on the type of surface. Due to the roughness of the surface, consumption on felt roofing felt will be different than on concrete, metal roofs, or roofs covered with PUR foam.

What are the optimal weather conditions for installing acrylic waterproofing?

Temperature +12° to +40°C, no rain for at least 24 hours after application, relative humidity <80%. It is worth remembering that for proper curing, the minimum temperature should be maintained for the entire 7-day period until full functionality is achieved.

How to reinforce critical points of the roof (e.g. flashings, corners)?

Apply a reinforcing fabric (e.g. Neotextile® ) embedded between the first and second layers of acrylic coating, using the wet-on-wet method.

What mistakes should you avoid when waterproofing with acrylic?

Although acrylic coatings are easy to apply, certain mistakes can significantly impact their effectiveness and durability. In this section, we discuss the most common mistakes and suggest how to avoid them to avoid costly repairs.

Incorrect preparation of the substrate

Contamination, lack of primer, or moisture can cause poor adhesion and membrane detachment. Always follow the steps above to ensure maximum resin adhesion to the existing substrate.

Failure to follow the manufacturer's recommendations

Improper use, application, or drying time can reduce the effectiveness of the insulation. Before using the material, both primer and the actual membrane, we recommend reviewing the manufacturer's technical data sheet and paying attention to the entire application process.

Application in unsuitable weather conditions

Rain or low temperatures immediately after application can damage the coating. Water-based coatings typically become resistant to rain and moisture, including precipitation, over time. This period typically lasts for several hours, although it obviously depends on atmospheric conditions such as temperature and humidity. 

Skipping reinforcements

Lack of reinforcement at critical points is the most common cause of leaks after several seasons. It's important to remember that all surface joints, both horizontal, such as at the joints of felt sheets, and at the intersection of vertical and horizontal lines, are areas exposed to greater stress and strain. Therefore, their absence or improper protection can lead to leaks and impermeability of the entire coating applied using an acrylic waterproofing membrane.

How to care for a roof with an acrylic coating so that it lasts for years?

After waterproofing work is complete, continued roof care and maintenance are also important. Regular inspections, cleaning, and prompt response to minor damage are key to maintaining full waterproofness for years to come.

How often should a roof be inspected?

At least once a year, and after every heavy rainfall, windstorm, or hailstorm. This will allow for a quick response if necessary.

How to properly clean acrylic waterproofing?

It's best to use a mild detergent and water, and avoid sharp tools. Wash with a pressure washer at low pressure.