CSLB C-39 Roofing ContractorSafety and RepairEasy
A roofing contractor is performing a reroofing project on a commercial building with a low-slope roof. During the tear-off, the crew discovers that the existing insulation is saturated with water. What is the most appropriate action for the contractor to take regarding the saturated insulation?
- APunch holes in the saturated insulation to allow for drainage and then install the new roof.
- BRemove and replace all saturated insulation before installing the new roofing system.
- CInstall a vapor barrier over the saturated insulation to prevent moisture migration.
- DLeave the saturated insulation in place, as it will dry out once the new roofing system is installed.
Show answer & explanationAnswer & explanation
Correct answer: B. Remove and replace all saturated insulation before installing the new roofing system.
Saturated insulation significantly reduces thermal performance and can lead to moisture-related issues, including mold growth and premature degradation of the new roofing system. It must be removed and replaced.
Why the other options are wrong
- A. Punching holes in insulation is ineffective for drying and compromises the insulation's integrity.
- C. Installing a vapor barrier over saturated insulation traps moisture, exacerbating the problem.
- D. Leaving saturated insulation is incorrect as it compromises thermal performance and can lead to further damage.
Saturated Roof Insulation
Roof insulation that has absorbed water, compromising its thermal performance and potentially leading to structural and mold issues.
- Reduces R-value significantly.
- Can lead to mold and rot.
- Must be removed and replaced.
Memory trick: Wet blanket on a roof, bad news from the start.