Technology: Expanded Clay Concrete (LECA Concrete)

 Technology: Expanded Clay Concrete (LECA Concrete)

Technical Specification – Domki Marysia

Structural Material:

  • Expanded Clay Concrete (LECA concrete) – lightweight concrete with expanded clay aggregate
  • Concrete class: C20/25 or C25/30
  • Density: 900–1400 kg/m³
  • Thermal conductivity: λ = 0.10–0.14 W/mK

Applications:

  • Load-bearing external walls (thickness: 20–24 cm)
  • Interior load-bearing and partition walls
  • Prefabricated in factory, assembled quickly on site

Performance Properties:

  • Excellent thermal insulation – can achieve passive standard without additional insulation
  • Fire resistance: REI 120
  • High thermal mass – stable indoor climate
  • Excellent sound insulation – walls reduce noise up to 55 dB

Sustainability & Durability:

  • 100% natural material – expanded clay is fired clay aggregate
  • Resistant to mold, fungi, pests
  • VOC-free – does not emit volatile organic compounds
  • Long lifespan – over 80 years

Installation Parameters:

  • Suitable for slab or strip foundations
  • Prefab wall modules installed in 2–3 working days
  • Compatible with flat or pitched roofs

Usage in Domki Marysia:

  • Recommended for clients who value durability, energy efficiency, and fast assembly
  • Wall modules delivered as ready-to-install panels, with optional plaster or wooden cladding finish

Choose Your Wall System

Which construction technology suits you best?

We offer two proven systems – both with turnkey production and on-site assembly. Each has its own strengths. Here’s a quick comparison:

Feature

Expanded Clay Concrete (Keramzytobeton)

Wooden Frame (Timber Frame)

Durability

80+ years, extremely solid

50+ years, lightweight structure

Thermal Performance

Very high, thermal mass regulates climate

Excellent, requires additional insulation

Fire Resistance

Very high (REI 120)

Medium, fire-treated timber

Sound Insulation

Excellent (up to 55 dB)

Moderate, depends on insulation layers

Installation Speed

2–3 days

1–2 days

Ecological Impact

Natural + mineral, recyclable

Renewable material, low CO₂ footprint

Interior Climate

Stable, low humidity fluctuations

Warmer in feel, faster to heat

Price

Slightly higher

More economical

 

 

FAQ – Frequently Asked Questions

Q: Can I build on a slab foundation?
A: Yes. Both systems are compatible with slab or strip foundations. We’ll help adjust the design to your plot.

Q: Is insulation included in the wall modules?
A: Yes. Both systems include integrated insulation (e.g., mineral wool or PIR). U-values depend on the package selected.

Q: Can I customize the exterior finish?
A: Yes. Choose from wooden cladding, plaster, or other finishes. We’ll advise what fits best to your surroundings.

Q: Which system is better for a summer home?
A: Wooden frame is great for seasonal use due to its speed and price. Concrete is better for year-round living and rental.

Q: Can I get a passive-standard house?
A: Yes, especially with the keramzyt system. With the right window and roof package, we can meet EH55 or better.

Q: How does transport and assembly work?
A: We produce the modules in our factory and deliver them by truck. Assembly on site takes a few days – all done by our certified team.

📩 Still not sure which option to choose? Contact us – we’ll help you select the best match for your location, usage and budget.