Self Levelling Mortar: Types, Technical Specs and Installation Guide
Table of Contents
1. Basic Overview of Self Levelling Mortar
2. Main Types of Self Levelling Mortar
3. Performance Parameter Comparison Data
4. Core Advantages Over Traditional Screed
5. Common Application Scenarios
6. Basic Installation Tips
7. Industry FAQs
Basic Overview of Self Levelling Mortar
Self Levelling Mortar is a flowable cementitious flooring material. It is designed to flatten uneven concrete floors with minimal manual work.
This material has excellent fluidity after mixing with water. It spreads evenly on base floors by gravity. It forms a flat, smooth and high-strength base layer for final floor finishes.
Self-leveling compound and floor levelling screed are the most common alternative names in global construction markets. They refer to the same functional building material.
It widely replaces traditional cement screed in modern residential and commercial construction. It fix floor height differences and surface defects effectively.
Main Types of Self Levelling Mortar
Two mainstream types dominate the construction industry. Each type has unique performance and applicable environments.
Cement-Based Self-Leveling Compound
This is the most widely used self levelling mortar. It has good moisture resistance and high structural strength.
It adapt to wet and dry indoor environments. It suit long-term heavy-load use in industrial spaces.
Gypsum-Based Self-Leveling Mortar
Gypsum-based products have fast setting speed. They finish surface hardening in a short time.
This material not fit humid areas. It easy to absorb moisture and lose structural stability in wet conditions.
Performance Parameter Comparison Data
The table below shows verified performance data of different self levelling mortar types and traditional screed. All test standards follow EN 1015-3 industrial specifications.
Performance Index | Cement-Based Self Levelling Mortar | Gypsum-Based Self Levelling Mortar | Traditional Concrete Screed |
Flow Spread (mm) | 240–280 | 220–260 | 50–100 |
28-Day Compressive Strength (MPa) | 25–40 | 10–15 | 15–20 |
28-Day Flexural Strength (MPa) | ≥4.0 | 2.0–3.0 | ≤2.5 |
Full Curing Time | 3–7 days | 24–48 hours | 7–14 days |
Shrinkage Rate | ≤0.03% | 0.05% | 0.1%–0.3% |
Moisture Resistance | Excellent | Poor | Medium |
Cement-based self-leveling products show more stable overall performance. It has lower shrinkage and higher strength than traditional screed.
Gypsum-based mortar gain strength faster. But it can only use in dry indoor environments.
Core Advantages Over Traditional Screed
Self levelling mortar save much construction time on site. Workers do not need repeated manual troweling and leveling.
The material produce ultra-flat floor surface. It leave no uneven bumps or hollow gaps.
It has controlled shrinkage rate. It greatly reduce floor cracking risk after long-term use.
High-strength formulas can bear frequent forklift rolling and heavy object pressure. It fit industrial floor long-term use.
Common Application Scenarios
Commercial Building Flooring
Shopping malls, office buildings and exhibition halls use self-leveling compound widely. It provides flat base for carpet, vinyl flooring and ceramic tiles.
Industrial Floor Renovation
Factory floor renovation projects choose high-strength cement-based self levelling mortar. It upgrade old uneven floors to meet industrial load standards.
Residential Interior Decoration
Home floor heating projects and interior renovations use this material. It adapt thin-layer paving and ensure floor flatness.
Basic Installation Tips
Clean the base floor completely before construction. Remove dust, oil and loose concrete residues.
Apply primer evenly on the base surface. Primer stop excessive water loss of fresh mortar.
Control mixing water ratio strictly. Too much water reduce final strength. Too little water affect fluidity and leveling effect.
Finish pouring within 20 to 40 minutes. The workable time limited for best leveling performance.
Industry FAQs
Q1: What is the difference between self levelling mortar and ordinary screed?
Self levelling mortar has high fluidity and low shrinkage. It form flat floors automatically. Ordinary screed need manual leveling, easy to crack and uneven after curing.
Q2: Which type is better for wet area construction?
Cement-based self-leveling compound is the only choice. Gypsum-based mortar has poor moisture resistance. It will degrade in humid environments.
Q3: How long can you walk on self-leveling mortar surface?
Gypsum-based products allow foot walking in 24 to 48 hours. Cement-based types need 3 to 7 days for full curing before heavy use.
Q4: What floor thickness can self levelling mortar achieve?
Standard single pouring thickness ranges from 3mm to 50mm. High-strength formulas support thicker paving for industrial floor repair.