100+ Free InterNACHI Stucco/EIFS Inspector Practice Questions

The credential, the prerequisite 'Advanced Stucco & EIFS Inspection Training for Inspectors' course, and the final exam are all FREE for InterNACHI members. The cost is included in InterNACHI membership dues (currently around $49 per month). There is no separate proctoring or testing-center fee — the course and 50-question exam are delivered online through the InterNACHI School.

The final exam contains 50 multiple-choice questions drawn from a larger item pool, many of which reference photographs of stucco and EIFS conditions. The exam uses weighted scoring: individual questions and individual answer choices carry different point values, with passing requiring meeting an approximate 80-point weighted cut-off. The exam is self-paced and delivered online through the InterNACHI School.

Barrier (face-sealed) EIFS resists water at the exterior face only — it has no drainage plane or water-resistive barrier behind the EPS — and was the dominant residential install before the mid-1990s. Drainage EIFS (also called EIFS with EWRS or water-managed EIFS) adds a continuous WRB and a drainage plane behind the EPS, typically formed by ribbon adhesive or grooved EPS, plus a starter track that weeps incidental water. Since the 2009 IBC, Section 1408 has effectively required drainage EIFS on residential Type V Group R construction, and drainage EIFS is the predominant form installed today.

The InterNACHI Phase I Standards of Practice for Inspecting Exterior Wall Cladding require a visual, non-invasive inspection of the readily accessible and visible portions of the cladding. The inspector identifies the cladding system, observes defects, and writes a report with recommendations for further investigation or repair. The SoP does NOT require destructive probing, water testing, infrared cameras, or removal of any cladding. When deeper investigation is needed, the inspector refers the client to a forensic specialist who can perform ASTM E2128 work.

Per IRC R703.7.2.1 (and the matching IBC text), the weep screed at the foundation plate line must be installed not less than 4 inches above earth or 2 inches above paved areas. The weep screed must be a minimum 0.019-inch (26-gauge) corrosion-resistant material with a minimum 3-1/2 inch vertical attachment flange. The water-resistive barrier and lath must lap over the screed's back flange so that incidental water drains out at the screed rather than back into the wall.

Kickout (diverter) flashing is installed at the bottom of a roof-wall intersection where step flashing terminates at the gutter. It diverts the concentrated runoff away from the wall and into the gutter rather than letting it run down behind moisture-sensitive cladding. Missing kickout flashing is one of the most common causes of severe hidden rot behind stucco and EIFS because the runoff is highly localized and saturates the substrate at one point for years before any exterior staining is visible.

Inspectors commonly screen with a Tramex Wet Wall Scanner or Tramex RWS (capacitance/impedance scanner that reads through the EIFS lamina without penetration) and corroborate hot spots with infrared thermography under appropriate thermal-load conditions. Pin probes such as the Delmhorst BD-2100 with 21-E or 26-ES electrodes are penetrative and require small holes; many states classify probe penetration of EIFS as a forensic activity that exceeds the InterNACHI Phase I visual SoP and must be performed under ASTM E2128 by a qualified specialist.