Independent, THERM-validated proof your windows, doors and façades comply.
Condensation and mould disputes land on whoever signed the design off. We model the actual window and interface on your project to ISO 15099 — certifier-ready evidence, not a generic rating. The lab behind NCC compliance from tier-1 façades to single dwellings.
Not just U‑values — condensation, mould, embodied carbon, recyclability and weight, from one model.
Independent lab · ISO 15099 · our CFL solver is THERM-validated — 98.7% across 222 results
Which one are you?
Not sure which? Send us one window — we’ll model it free →
Or explore our case studies — starting with the interactive VCA TIRS study →