Material libraryMaterials
Design values are ranges, not universal constants. Final builds should use the selected product data sheet.
PLYWOODExterior plywood
λ ≈ 0.17 W/mKrange 0.1–0.18 W/mK
The V1 thermal calculation uses 0.17 W/mK as a conservative birch/marine plywood reference. Actual conductivity depends on species, density and moisture; the final build should use the selected panel data sheet.
XPSXPS insulation
λ ≈ 0.033 W/mKrange 0.031–0.037 W/mK
50 mm → 0.033 W/mK60 mm → 0.033 W/mK
V1 assemblies at 50 and 60 mm use λD 0.033 W/mK from the FIBRANxps 300 technical data sheet. A different product should replace this value with its own DoP/data sheet.