Views: 36 Author: Site Editor Publish Time: 2025-04-14 Origin: Site
Insulation mortar is a premixed dry powder material composed of insulating aggregates, cementitious binders, and modifying additives. It is designed to create thermal insulation layers on building surfaces. Unlike lightweight gypsum plaster (used for interior wall leveling), insulation mortar focuses on thermal performance and is applied to exterior walls or specific energy-efficient structures.
1. Inorganic Insulation Mortar
Composition:
- Lightweight aggregates: Vitrified microspheres or expanded perlite.
- Binders: Cement + polymers (e.g., HPMC/RDP for adhesion and flexibility).
- Additives: Crack-resistant agents, waterproofing modifiers.
Key Advantages:
✅ Fireproof (Class A1 non-combustible).
✅ Durable: Resists aging, moisture, and cracking.
✅ Eco-friendly: No toxic emissions.
Typical Application Steps:
1. Surface Prep: Clean the substrate, apply interface mortar.
2. Base Coat: Mix vitrified microsphere mortar with water, apply in 2 layers (15–20mm total).
3. Reinforcement: Embed alkali-resistant fiberglass mesh in anti-crack mortar (3–4mm).
4. Finish: Plaster + paint.
2. Organic Insulation Mortar
Composition:
- Lightweight aggregates: Expanded polystyrene (EPS) beads.
- Binders: Cement + redispersible polymer powder (RDP).
Pros & Limitations:
✔ Better insulation (lower thermal conductivity than inorganic).
✔ Lower cost.
❌ Flammable (requires fire barriers).
❌ Poor weather resistance (shrinks/cracks over time).
Application:
1. Primer: Apply EPS-compatible interface agent.
2. Base Coat: Mix EPS beads with adhesive powder, trowel or spray.
3. Reinforcement: Cover with mesh + anti-crack mortar (2–3mm).
| Factor | Inorganic Insulation Mortar | Organic Insulation Mortar |
|---|---|---|
| Thermal performance | Good (λ: 0.07–0.09 W/m·K) | Excellent (λ: 0.05–0.06 W/m·K) |
| Fire safety | Non-combustible | Flammable (needs fire treatment) |
| Cost | Higher | More budget-friendly |
| Durability | 20+ years | 10–15 years |
Recommendation:
- High-rises/hot climates: Inorganic (safety + longevity).
- Temp projects/cost-sensitive: Organic (with fireproof coatings).
- HPMC: Improves workability, water retention (>95%), and open time.
- RDP: Enhances bond strength (≥0.25 MPa) and flexural toughness.
