Mold testing in DDB-built homes
Two occupied homes built with ThermaTech panels. Indoor and outdoor air sampled on the same day. Here’s what the testing found.
The main takeaway
Each home’s indoor samples were below its outdoor sample at the time of testing.
Home A
Compared with outdoor air on the same day.
Outdoor air = 100%. Indoor results are shown relative to that sample. Striped gold shows the indoor sample range.
Home B
Compared with about 120 outdoors, in spores per cubic meter.
Airborne spores per cubic meter. Lower counts mean fewer spores in the sampled air. Striped gold shows the indoor sample range.
These homes were tested before we added mold-resistant interior framing lumber to our approach. These are one-time observations; moisture control still matters, and results vary by home.
A little more context
Mold spores occur outdoors and can enter a home. The inspector compared each home with its own outdoor sample. “No amplification” means the sampled air did not indicate a stronger indoor mold source at that moment.
These observations cannot rule out hidden mold or show that the panels alone caused the results. There was no conventional-framing comparison group.
We plan drainage, keep framing dry, address visible growth, and consider air sealing and ventilation together. Our standard is REZWOOD 2200 where its approved uses fit. Conventional framing lumber is also available.
Explore our building approachThe complete EnviroPro opinion explains the homes, sampling, and findings. It also includes separate chemical-emissions testing, which measures something different from mold-spore counts.
Read the original professional opinion (PDF) See ThermaTech’s detailed results and chartsWe’ll help you understand the materials and choices for your build.