An EIFS (Exterior Insulation and Finish Systems) inspection checks whether water has gotten behind the cladding. A visual inspection looks at leak-prone spots such as the base of the wall, windows, doors and roof-wall joints. Moisture testing goes further. The International Association of Certified Home Inspectors (InterNACHI) describes pushing a small probe through holes about 1/8 inch wide into the wall framing.
Last reviewed: September 2026. Sources are listed at the end of this page.
What does a visual EIFS inspection look at?
A visual inspection looks at the places where water most often gets behind EIFS. InterNACHI names these common leak points.[1]
- At or near the ground. InterNACHI recommends at least 6 inches of clearance between the EIFS and grade.
- Roof-wall intersections. Look for missing kickout flashing.
- Window and door joints.
- Cracks or bulges in the EIFS surface.
For kickout flashing, the Building America Solution Center (BASC) specifies flashing at least 4 inches up the wall and 4 inches out, made of 26-gauge galvanized steel.[2] Sealant joints matter too. Sto Corp.’s maintenance guide includes inspecting caulk and replacing it as needed.[3]
Does a standard home inspection test EIFS for moisture?
No. The standards for home inspections and visual cladding inspections do not call for probing the wall.
- InterNACHI’s Home Inspection Standards of Practice say an inspection is not technically exhaustive and will not identify concealed or latent defects.[4]
- The American Society of Home Inspectors (ASHI) Standard of Practice does not require inspectors to determine concealed conditions or latent defects.[5]
- InterNACHI’s Phase I standard for exterior wall claddings is a visual standard. It excludes intrusive testing such as probing and destructive cores. Invasive testing is a separate, more technical inspection.[6]
| Phase I visual inspection | Invasive moisture testing | |
|---|---|---|
| What it involves | A visual look at the cladding[6] | Probing through the outer wall into the frame area[1] |
| Holes in the wall | None. Probing and destructive cores are excluded.[6] | Small holes about 1/8 inch wide[1] |
| What it can find | Visible leak points, cracks and bulges[1] | Moisture in the framing behind the finish[1] |
| How InterNACHI classes it | Phase I[6] | A separate, more technical inspection[6] |
If you want moisture readings, ask for invasive testing by name. See what a home inspection covers for the full list of standard exclusions.
How does probe moisture testing work?
The inspector measures moisture in the wood behind the EIFS. InterNACHI describes inserting a small probe through the outer wall into the frame area, using holes about 1/8 inch wide.[1]
The readings are moisture content percentages. The sources use slightly different thresholds.
- InterNACHI associates wood rot with sustained moisture content of about 30%.[1]
- Building Science Corporation (BSC) puts wood above about 25 to 30% moisture content in the mold-growth range. It says 28% or more supports decay fungi.[7]
Ask the inspector to report each reading with its location. That record helps if you later need to document a construction defect.
Is there an ASTM standard for inspecting installed EIFS?
The main EIFS product standard is not an inspection standard. ASTM International says ASTM E2568, the specification for PB EIFS, covers product qualification, not in-service evaluation.[8] The EIFS Industry Members Association (EIMA) also lists ASTM E2359 for field pull testing.[9] Our sources do not describe a standard method for moisture testing a finished home.
What should you ask before hiring an inspector?
Ask what the inspection includes and what it leaves out. These questions follow from the standards above.
- Is this a visual inspection only, or will you do invasive moisture testing?
- Where will you probe? InterNACHI’s leak points are a good checklist: the base of the wall, roof-wall intersections, window and door joints, and cracks or bulges.[1]
- Will the written report list each moisture reading and where it was taken?
If you are not sure your walls are EIFS, start with EIFS vs. stucco.
This page is general information, not engineering advice. Have a licensed professional engineer or qualified inspector evaluate your home.
Related guides
- EIFS problems, codes and care
- EIFS vs. stucco: how to tell them apart
- What a home inspection covers and what it doesn’t
- Water intrusion and building envelope defects
- How to document a construction defect
Sources
- InterNACHI, “Water Damage and EIFS.”
- Building America Solution Center (DOE/PNNL), “Step and Kick-Out Flashing at Roof-Wall Intersections,” last updated Sept. 14, 2020.
- Sto Corp., “StoTherm EIFS Reference Guide: Repair and Maintenance (S707B 02/11).” Manufacturer.
- InterNACHI, “Home Inspection Standards of Practice.”
- American Society of Home Inspectors (ASHI), “ASHI Standard of Practice for Home Inspections,” effective Mar. 1, 2014 (PDF dated Mar. 4, 2015).
- InterNACHI, “International Phase I Standards of Practice for Inspecting Exterior Wall Claddings.”
- Kohta Ueno, Building Science Corporation, “PA-1904: How to Look at a House like a Building Scientist (Part 4: Water),” Aug. 5, 2021.
- ASTM International, “ASTM E2568-17a(R26), Standard Specification for PB Exterior Insulation and Finish Systems.”
- EIFS Industry Members Association (EIMA), “EIFS Standards.”