How to Apply Perlite Screed?

Step-by-Step Application Guide (2026)

Perlite screed is a lightweight filling and leveling screed that provides thermal and sound insulation on floors. When applied correctly, it creates both a durable and long-lasting floor surface.

So, how is perlite screed applied? Here are all the details:

1. Surface Preparation

The surface must be prepared before application.

• The floor must be clean (free of dust, oil, and dirt)
• Loose particles must be removed
• The surface must be sound and dry
• Surface repairs should be made if necessary

A clean surface ensures that the screed adheres firmly.

2. Mortar Preparation

Perlite screed is prepared by mixing it with water.

Average mixture:

• 1 bag of screed

• 10 – 12 liters of water

• Mix with a low-speed mixer

• Mix for 5 min – Let it rest for 2 min – Mix again

• A homogeneous and fluid consistency should be achieved.

3. Application Phase

The prepared mortar is applied to the floor.

Application methods:

• Machine spraying

• Manual application with a trowel

• Pour onto the surface

• Spread evenly with a gauge (screed bar)

• Level the surface

4. Application Thickness