How do Ottawa contractors test for trapped moisture in an older EIFS installation?

Moisture Detection in Older EIFS Systems

Ottawa contractors use several proven methods to detect trapped moisture in older EIFS installations, with infrared thermography being the most common and effective approach. During Ottawa's heating season (October through April), thermal imaging cameras can clearly identify areas where trapped moisture creates temperature differentials in the wall assembly. Wet insulation shows up as cooler areas on the thermal image because water conducts heat away from the building envelope more rapidly than dry foam board.

Invasive moisture meters provide the most definitive readings but require small probe holes through the EIFS finish. Contractors drill tiny holes (typically 3-4mm diameter) at strategic locations and insert moisture probes directly into the foam insulation layer. This method gives precise moisture content readings but does require patching the test holes afterward. Many Ottawa contractors combine this with non-invasive moisture scanning using electromagnetic field meters that can detect moisture through the EIFS surface, though these are less precise than invasive testing.

Core sampling is used when contractors suspect significant moisture damage or need to assess the condition of the substrate behind the EIFS. This involves cutting small circular samples (usually 2-3 inches diameter) through the entire wall assembly to visually inspect for water damage, mold growth, or deterioration of the underlying sheathing or framing. Core samples also reveal whether the original installation included proper drainage planes and weather-resistive barriers, which were often omitted in EIFS installations from the 1980s and early 1990s.

Comprehensive moisture testing for a typical Ottawa home runs $800 to $2,000 depending on the size of the building and extent of testing required. Infrared scanning alone costs $400 to $800, while invasive moisture testing adds $300 to $600. Core sampling runs $150 to $300 per sample location. Many contractors include basic moisture scanning as part of their assessment when providing repair quotes.

Ottawa's extreme freeze-thaw cycles make moisture detection particularly critical because trapped water can cause catastrophic damage to EIFS systems during winter months. Contractors typically recommend moisture testing during late fall (October-November) when any summer moisture infiltration has had time to accumulate but before winter freeze-up occurs. Spring testing (April-May) can also reveal winter damage from ice formation within the wall assembly.

If moisture testing reveals problems, contractors will need to remove affected EIFS sections, address any substrate damage, install proper drainage and weather barriers, and reinstall the system. This remediation work requires Ontario Building Code compliance and may need permits if the work involves structural repairs or changes to the building envelope.

For reliable moisture assessment of your EIFS system, consider browsing experienced contractors through the Ottawa Construction Network directory who specialize in EIFS inspection and remediation work.