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Panel, brick or concrete:
the figures, with sources

17.4 cm of our panel (OSB with 150 mm of insulation) insulates like 35 cm of brick. Every figure has its source; the panel figures are calculated.

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Illustration: cross-section of a 17.4 cm SIP panel, OSB/3, EPS and OSB/3

SIP 174

17.4 cm

Illustration: cross-section of a 35 cm brick cavity wall with render, mineral wool and inner leaf

Brick

35 cm

Illustration: cross-section of a concrete wall of about 36 cm with EPS and render

Concrete

≈ 36 cm

Same insulation, same scale · Illustration

4 figures that decide

  • Wall thickness, same insulation

    17.4 cm

    Brick 35 cm · Concrete ≈ 36 cm

    2 × thinner: more usable floor area

    Hispalyt, Structura wall

  • Wall weight

    ≈ 17–18 kg/m²

    Brick ≈ 240 kg/m² · Concrete ≈ 510 kg/m²

    ≈ 14 × lighter: less load and lower seismic force (NCSE-02)

    CTE DB SE-AE

  • Cost per m²

    from €1,300/m² + VAT

    Brick / Concrete: €1,560–1,770/m², 2-storey house, mid-range

    Excludes foundations, design and permit

    OCU, 2026

  • Build time

    ≈ 1 week

    frame; turnkey house ≈ 6 months after design approval

    Numbered pieces, dry assembly

    EcoViva, depending on the design

Meets what the Spanish code (CTE) asks of a house

Each point is justified in your house design.

  • Structural safety DB-SE

    Calculated in the design; 50-year service life, like brick and concrete.

  • Fire DB-SI

    A detached house needs R 30; achieved with an EI 30 inner board.

  • Energy saving DB-HE

    The wall insulates 2 × better than the CTE requires in zone B.

  • Moisture DB-HS

    Vapour barrier, membrane and sole plate under the panel.

  • Earthquakes NCSE-02

    Seismic force is calculated from weight: the wall weighs 14 × less.

Tested since 1935

In 1935–1937 the Forest Products Laboratory (Madison, USA) built the first experimental house with stressed-skin panels, the forerunner of this type of panel. Its panels were inspected after 25 years of service.

USDA Forest Service, FPL Report 18 (1964)

The table, in short

SIPBrickConcrete
Wall thickness, same insulation17.4 cm35 cm≈ 36 cm
Wall weight≈ 17–18 kg/m²≈ 240 kg/m²≈ 510 kg/m²
Cost per m²from €1€1
FireDepends on liningREI 120R 120
Service life the code requires50 years50 years50 years

SIP: our SIP 174 panel, OSB with 150 mm of insulation. Calculated values, pending data sheet; timings depend on the design.

Sources (8)
  1. CTE DB-SE, 1.1: service period
  2. CTE DB SE-AE, annex C: weights
  3. CTE DB-SI: table 3.1, annexes C and F
  4. CTE construction elements catalogue: λ
  5. Hispalyt: Structura wall, U 0.23
  6. NCSE-02, 3.7.3: seismic forces
  7. OCU, March 2026: building costs
  8. UPF Barcelona School of Management, 2025: off-site construction

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