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OBJECTIVE MATERIAL INTELLIGENCE•NO UNIVERSAL WINNER POLICY

MATERIAL COMPARISON WORKSTATION

Objective side-by-side engineering comparison across density, thermal conductivity ($lambda$), compressive strength, water absorption, fire Euroclass reaction (A1–F), and acoustic behavior.

CATEGORY: Thermal Insulation

Facade & Building Thermal Insulation: EPS vs. XPS vs. Rock Mineral Wool

Ref: Normativ C 107 & Normativ P118/2 & SR EN 13162-13164

Expanded Polystyrene (EPS 80 / Graphite EPS)

Class E (Combustible)

Density:15 - 20 kg/m³

Thermal Cond. (λ):0.030 - 0.038 W/(m·K)

Compressive Str.:≥ 80 - 100 kPa

Water Absorption:≤ 2.0% (vol)

Acoustics:Low (Poor airborne sound damping)

Optimal Applications:

✓Standard exterior ETICS facade insulation
✓Pitched roof rafters
✓Cost-effective thermal retrofit

Critical Limitation:

Combustible; requires mineral wool fire barriers (P118/2) on multi-story facades

Extruded Polystyrene (XPS)

Class E (Combustible)

Density:30 - 45 kg/m³

Thermal Cond. (λ):0.033 - 0.036 W/(m·K)

Compressive Str.:300 - 700 kPa

Water Absorption:≤ 0.7% (Near Zero)

Acoustics:Low

Optimal Applications:

✓Basement foundation perimeter walls
✓Inverted flat roofs
✓Under-slab raft insulation
✓Plinth splash zones (soclu)

Critical Limitation:

Low vapor breathability (μ > 100); higher cost than standard EPS

Rock Mineral Wool (Vată Bazaltică)

Class A1 (Non-combustible)

Density:80 - 150 kg/m³

Thermal Cond. (λ):0.034 - 0.038 W/(m·K)

Compressive Str.:≥ 30 - 50 kPa

Water Absorption:≤ 1.0 kg/m² (Short-term)

Acoustics:Exceptional (High airborne sound absorption)

Optimal Applications:

✓High-rise building envelopes
✓Ventilated facade systems
✓Acoustic partition walls
✓Fire barrier bands

Critical Limitation:

Heavier weight requiring heavy-duty anchor fixings; must be protected from liquid water during installation

ENGINEERING SELECTION PRINCIPLE

Selection depends entirely on functional zone: XPS is unmatched for below-ground foundations and inverted roofs due to water resistance; Rock Wool is mandatory for high-rises and ventilated facades due to Class A1 fire safety and acoustics; Graphite EPS offers optimal thermal cost efficiency on standard low-rise masonry facades.

CATEGORY: Masonry & Walling

Masonry Walling Units: Ceramic Hollow Blocks vs. Autoclaved Aerated Concrete (AAC / BCA)

Ref: CR 6-2013 & SR EN 771-1 / SR EN 771-4

Ceramic Hollow Blocks (Porotherm / Brikston)

Class A1 (Non-combustible)

Density:750 - 850 kg/m³

Thermal Cond. (λ):0.14 - 0.20 W/(m·K)

Compressive Str.:10.0 - 15.0 N/mm² (High)

Water Absorption:10 - 15%

Acoustics:Good (High mass Rw = 46 - 52 dB)

Optimal Applications:

✓Confined masonry load-bearing walls (CR 6-2013)
✓Acoustic apartment party walls
✓High-thermal-inertia exterior walls

Critical Limitation:

Higher dead weight; requires careful hammer-free drilling for wall fixings

Autoclaved Aerated Concrete (AAC / BCA Ytong / Macon)

Class A1 (Non-combustible)

Density:400 - 550 kg/m³

Thermal Cond. (λ):0.09 - 0.12 W/(m·K) (Superior)

Compressive Str.:2.5 - 5.0 N/mm² (Moderate)

Water Absorption:Higher hygroscopic uptake

Acoustics:Moderate (Requires dense rendering)

Optimal Applications:

✓Non-bearing infill walls in multi-story RC frames
✓Fast lightweight interior dividing partitions

Critical Limitation:

Lower compressive load capacity; requires weather-resistant external render

ENGINEERING SELECTION PRINCIPLE

For load-bearing structural walls, Ceramic Blocks are required per CR 6-2013 due to superior compressive strength (10-15 MPa). For infill walls in tall reinforced concrete frames, AAC (BCA) is highly advantageous because it reduces total seismic dead weight by ~40% while providing superior intrinsic thermal insulation (λ = 0.09 W/mK).