InterNACHI Deck Inspector study guide
InterNACHI Deck Inspector · Work through your exam, one topic at a time.
The InterNACHI Deck Inspector credential is one of the specialty certification exams offered within the InterNACHI® (International Association of Certified Home Inspectors) training and certification ecosystem. This page is an independent study resource for candidates preparing for that deck-focused exam; it is not affiliated with, endorsed by, or operated by InterNACHI®. The exam targets working home inspectors, multi-inspector firm staff, and inspectors adding ancillary services who want to demonstrate competence in evaluating wood-framed decks and their attached components. Content is organized into two domains of equal weight: deck inspection procedures and defect recognition, and InterNACHI Standards of Practice and reporting. Topics on this exam: Deck inspection procedures and defect recognition and InterNACHI Standards of Practice and reporting. The InterNACHI Deck Inspector study guide has 2 sections and about 768 words.
01Deck Inspection Procedures and Defect Recognition
This domain asks you to follow the load path - decking, joists, ledger, posts, footings - and judge each connection as a potential failure point. Expect items on where to probe for decay, acceptable fasteners and placement, guard and stair geometry, and separating cosmetic wear from structural deficiency. InterNACHI's deck material notes that most collapses trace to a failed ledger-to-house connection, while most injuries come from guardrail failure. Confirm the ledger is preservative-treated and bears against the rim joist or a wall designed to carry it - never through siding alone.
420 words, about 2 min02InterNACHI Standards of Practice and Reporting
InterNACHI's SOP requires the inspector to inspect attached and detached decks, balconies, stoops, steps, porches, and their railings and means of attachment, and to report observed defects. It does not require determining code compliance, calculating load capacity, or predicting remaining service life, and a deck underside that is not readily accessible may be reported as not inspected with the reason stated. Location → observation → implication → recommendation. "Rear deck, ledger-to-rim connection: three fasteners are missing and the remaining lags are corroded; the ledger is relying on a few fasteners to carry the deck; recommend evaluation and repair by a licensed contractor before further use." That sentence is defensible because it reports what is visible and routes the engineering question to someone qualified.
348 words, about 2 min