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 to ISO 15099 — certifier-ready evidence, not a generic rating.
Not just U‑values — condensation, mould, embodied carbon, recyclability and weight, from one model.
Independent lab · ISO 15099 · our CFL solver is THERM-validated — 166 runs re-solved, 98.7% on production models · see the live record →
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 →
Or try BTW yourself → · see what it does → · read our Insights →
In their words
Ark Resources has worked with Dave Morehouse and AFRC Lab for many years. We use Build the Window (BTW) during concept and early design stages to assess window system performance using the proposed glazing specifications, providing project-specific performance values before detailed façade modelling is undertaken. As the design develops, AFRC Lab’s THERM modelling provides further validation, while onsite testing allows the performance of installed window systems to be verified against the design intent. This coordinated approach provides a reliable basis for façade design decisions and helps maintain consistency between the modelled, specified and installed window systems throughout the project.
Who’s behind AFRC Lab
Hi, I’m Dave.
Window nerd, through and through — I’ve been fascinated by how glass and frames actually behave since 1998. From then right up until I started AFRC Lab, I was in it with the builders, the window and door makers, and the crews who install them — which taught me how often the number on paper and the window that gets installed are two very different things.
So I started AFRC Lab to close that gap. We model the real window — and the junction around it — and prove it stands up before it’s built. No black box, no generic rating. Just me, the lab, and numbers I’ll happily stand behind. Send me one window and I’ll model it free — I genuinely love this stuff.
Dave Morehouse · Founder, AFRC Lab