U 0.15
HD III 44 Series
HDIII 44/20
U 0.15 W/m²K · NZEB compliant
0.15 U-value
REI 120 Fire
Class I (best) Acoustic
Pending Wall
Every Isotex ICF system.
One specification platform.
Filter and compare 17 products across four systems — insulated HDIII walls, HB formwork, acoustic partitions and wood-cement floor slabs. Specify by project type, thermal target or structural requirement. NBS clauses, BIM objects and EPD data available for every product in the range.
By project type Residential, Commercial & Social Match products to your project sector — incl. PassivHaus, PNRR & mid-rise
By thermal performance Set a U-value target From U 0.11 PassivHaus to U 0.27 W/m²K — filter by thermal requirement
By structural need Infill, Loadbearing or Mid-rise Filter by RC core capacity — from infill walls to high-structural 38-series
17 Products
4 Systems
0.11 Best U-value W/m²K
REI 120 Fire rating
CE All products
EPD S-P-01472
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HD III 44 Series Flagship Thermal Range
U 0.15
HD III 44 Series
HDIII 44/17
170mm EPS · U 0.15 W/m²K · NZEB compliant
0.15 U-value
REI 120 Fire
53 dB Acoustic
Pending Wall
U 0.21
HD III 44 Series
HDIII 44/14
140mm EPS · U 0.21 W/m²K · maximum structural capacity
0.21 U-value
REI 120 Fire
53 dB Acoustic
440mm Wall
U 0.11
HD III 44 Series
HDIII 44/23
230mm EPS · U 0.11 W/m²K · high-insulation infill option
0.11 U-value
REI 120 Fire
53 dB Acoustic
440mm Wall
HD III 38 Series Structural Loadbearing Range
U 0.15
HD III 38 Series
HDIII 38/17
170mm EPS · U 0.15 W/m²K · NZEB compliant
0.15 U-value
REI 120 Fire
53 dB Acoustic
380mm Wall
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System Comparison
Performance map
Thermal performance vs structural capacity
All HDIII products — U-value (lower = better thermal) · bubble size = total wall depth
Thermal vs structural: U-value W/m²K vs RC core thickness
44-series · Flagship thermal
38-series · Structural
Bubble size = wall depth (380–440mm)
| Specification | HD III 44 | HD III 38 | HB |
|---|---|---|---|
| Best U-value | 0.11 | 0.15 | — structural |
| Fire resistance | REI 120 | REI 120 | REI 120 |
| Acoustic Rw | 60 dB | 58 dB | — structural |
| Seismic (EC8) | ✓ Z1–2 | ✓ Z1–2 | ✓ |
| PassivHaus | ✓ 44/23 | — | — |
| Superbonus 110% | ✓ | ✓ | — |
| PNRR certified | ✓ | ✓ | ✓ |
| Configurations | 4 | 3 | 4 |
CE · ETA-08/0023
BBA Certified
EPD S-P-01472
REI 120
Seismic Z1–2
PNRR
Superbonus 110%
Free technical support
Not sure which block to specify?
Our technical team provides free feasibility studies, U-value calculations and compliance reviews for UK and Caribbean projects.
NBS specification clauses — ready to use
BIM objects — Revit, ArchiCAD, IFC, DWG
EPD data — S-P-01472 · Environdec verified
U-value calculations — free project review
Speak to the team
Technical consultation — free
Whether you're specifying a single dwelling, a social housing scheme, or a PNRR-eligible development — our engineers will help you select the right system and configuration.
UK — English building regulations
Caribbean — Dominican Republic market
Italy — PNRR & Superbonus compliance
Isotex · Verona, Italy · Est. 1987
Build with confidence.
Specify with precision.
NBS clauses, BIM objects, U-value calculations and EPD documentation — one pack, one working day.
90,000+Buildings delivered
0.11U-value W/m²K
EI 180Fire resistance
38+Years manufacture
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