Attic Mold Remediation — Kaysville, UT
Loss Type: Mold Remediation / Attic Condensation and Inadequate Ventilation
Location: Kaysville, UT near Sunset Drive
Response Time: Next-day scheduled
Job Duration: 2 days
Insurance: No – homeowner self-pay
The Situation
A homeowner near Sunset Drive in Kaysville, UT contacted us after a roofing contractor performing a routine inspection noticed black staining on the underside of the roof sheathing in the attic. The roofer suspected mold and recommended getting a mold remediation company involved before proceeding with any roofing work. The homeowner had no prior knowledge of a moisture problem and the home showed no visible interior symptoms.
We conducted an initial attic inspection the following day.
The Problem
Attic mold in northern Utah is a common but frequently misdiagnosed problem. The root cause in this home was a combination of two factors: bathroom exhaust fans venting into the attic space rather than to the exterior, and insufficient soffit ventilation that had reduced airflow through the attic below the level needed to prevent condensation buildup during winter months.
Warm moist air from the two upstairs bathrooms had been pumping directly into the attic every time a shower was used. That moisture condensed on the cold roof sheathing during winter nights and created ideal conditions for mold colonization. The affected area covered approximately 220 square feet of roof sheathing across the north-facing slope — the coldest and least ventilated section of the attic.
Moisture readings on the sheathing in the affected area confirmed elevated levels consistent with chronic condensation exposure. The mold growth was surface-level on the sheathing and had not penetrated the wood fiber, which kept the remediation scope manageable.
What We Did
Our attic mold remediation process in this case followed IICRC S520 protocol from containment through clearance testing. We established containment at the attic access hatch and ran a HEPA air scrubber throughout the remediation to capture airborne spores. The scope included:
- Dry ice blasting of all affected roof sheathing to remove surface mold growth without introducing additional moisture
- HEPA vacuuming of all disturbed surfaces and attic floor insulation in the affected zone
- Application of an EPA-registered encapsulant to all treated sheathing surfaces
- Documentation of the bathroom exhaust duct terminations for the homeowner’s contractor
We also documented the inadequate soffit ventilation in our report as a contributing condition requiring correction. Post-remediation air sampling was performed by an independent industrial hygienist before the job was signed off.
The Outcome
Post-remediation clearance testing confirmed spore counts within acceptable baseline levels. The homeowner’s contractor subsequently rerouted both bathroom exhaust fans to vent through the roof and added additional soffit vents to improve attic airflow. The roofing work the original contractor had planned proceeded after clearance was confirmed. Because the source conditions were corrected, the risk of recurrence was eliminated.
See more of our work in the area, including other Kaysville water damage jobs we’ve handled across the city.
“My roofer found mold up there and I had no idea it existed. Upkeep came out, explained exactly why it happened, and fixed it properly. They gave me a full report and clearance test so my roofer could get back to work. Really glad the roofer caught it.”
— M. and J. Larson, Kaysville UT