High-Performance Envelopes Have a Hidden Risk
Airtight, well-insulated assemblies are better at trapping moisture than they are at drying it out.
The Passive House Moisture Trap
Airtight = moisture stays put
Leaky construction lets moisture escape. Passive House assemblies are so airtight that moisture — whether introduced during construction or added by occupants — has nowhere to go if a design or detailing flaw exists. What used to dry out over a summer can now stay trapped.
Damage happens invisibly, mid-assembly
By the time you see mold or rot, the damage is months old. The critical risk window is between framing and drywall — when insulation and sheathing are in place but conditions aren't yet controlled.
Blower door tests check air — not moisture
Your QA checklist catches air leakage and thermal bridging. But no standard test tells you whether RH inside the assembly stayed below the damage threshold during the construction window.
A snapshot doesn't tell the story
A moisture meter reading on day 30 of a 90-day assembly window tells you conditions on day 30. It says nothing about what happened on day 12 after a rainy week, or day 47 when the HVAC wasn't commissioned yet. Moisture damage is cumulative. You need the full curve, not a spot check.
"The question isn't 'is it wet now?' It's 'was it ever too wet, for too long?'"
ShieldEyes Solves This
ShieldEyes provides continuous RH, temperature, and dew-point monitoring inside the wall assembly — from rough framing through commissioning and occupancy. Not a spot check. A log.
Because the probe and module are designed to remain accessible (never buried in drywall), you can retrieve the device, inspect it, or replace it after handoff. The data lives in your dashboard. If a warranty claim ever comes up, you have the record.