By Deck Building Services · Last reviewed
What should you check during a deck inspection?
The ledger connection, joists and beams, hangers and fasteners, posts and footings, railings, stairs and the decking surface — in that order.
- 1Ledger: no gap at the house, flashing present, no soft wood or staining behind it.
- 2Ledger fasteners: bolts or structural screws present — not nails alone.
- 3Joists: probe tops and ends for soft wood, especially under board seams.
- 4Hangers: every hanger fully nailed and not rusted through.
- 5Beams: no splits or rot, solidly seated on posts.
- 6Posts: plumb, not cracked, solid at the base.
- 7Footings: no heaving, sinking or erosion around them.
- 8Railings: firm under a strong push; balusters secure and closely spaced.
- 9Stairs: stringers solid, treads secure, landing level, handrail tight.
- 10Surface: no soft boards, popped fasteners, or trip hazards.
What do common inspection findings mean?
| Finding | Likely meaning | Next step |
|---|---|---|
| Popped nails or screws | Wood movement; possibly soft joist | Reset with deck screws; probe the joist |
| Dark stains on joist tops | Water trapped under boards | Probe for rot; add joist protection |
| Gap at the ledger | Connection loosening or failing | Stop using; get a structural inspection |
| Leaning post | Footing movement or rot at the base | Shore and replace post or footing |
| Rusty hangers | Corrosion reducing capacity | Replace with rated hardware |
| Railing moves when pushed | Under-anchored or rotted post | Re-anchor with blocking and bolts |
| Bottom stair step taller than others | Landing has settled | Rebuild the landing pad |
What tools do you need for a deck inspection?
- A flashlight for looking under the deck.
- A screwdriver or awl to probe for soft wood.
- A level to check posts and the deck surface.
- A tape measure for railing height and baluster gaps.
- A notepad or phone to photograph and record findings.
How do you test wood for rot?
Press a screwdriver into the wood. Sound wood resists; rotted wood lets the tip sink in easily or comes out in short, soft fibers.
Which findings mean you should stop using the deck?
A separating ledger, rotted posts, railings that move significantly, or sagging framing. Keep people off — especially large groups — until a professional has inspected it.
What happens after an inspection?
Minor items like popped fasteners can be fixed right away. Structural findings call for repair or, if widespread, replacement. Our repair-vs-replace guide explains how to decide.
How does deck safety inspection checklist differ across the states we serve?
Snow and ice add load and wear that make spring inspections more important. The figure varies most between Minnesota (50) and Georgia (1).
| State | Snowfall, in / yr (median) | What it means |
|---|---|---|
| Georgia | 1 | Light snow: occasional ice is the main winter concern for deck safety inspection checklist |
| Illinois | 38 | Moderate snow: plan winter use and ice-melt for deck safety inspection checklist |
| Kansas | 14 | Light snow: occasional ice is the main winter concern for deck safety inspection checklist |
| Maryland | 29 | Moderate snow: plan winter use and ice-melt for deck safety inspection checklist |
| Massachusetts | 49 | Heavy snow: load, shoveling and ice drive deck safety inspection checklist |
| Minnesota | 50 | Heavy snow: load, shoveling and ice drive deck safety inspection checklist |
| North Carolina | 3 | Light snow: occasional ice is the main winter concern for deck safety inspection checklist |
| Pennsylvania | 22 | Moderate snow: plan winter use and ice-melt for deck safety inspection checklist |
| Tennessee | 3 | Light snow: occasional ice is the main winter concern for deck safety inspection checklist |
| Virginia | 19 | Moderate snow: plan winter use and ice-melt for deck safety inspection checklist |
| Washington | 4 | Light snow: occasional ice is the main winter concern for deck safety inspection checklist |
Figures are medians across our covered communities in each state, from NOAA 1991–2020 climate normals and the Census Bureau's 2020–2024 American Community Survey. Each state and community page explains local conditions in more detail.