The Notched Joist and the Hot Tub Deck
At a 1994 colonial, the inspector evaluates a 12-by-16-foot elevated deck. The ledger board is a 2x10 attached through vinyl siding to the band joist with ½-inch lag screws spaced 24 inches on center; no flashing is visible above the ledger, and one screw is missing. The deck joists are 2x8 at 16 inches on center with a 10-foot span. At midspan, one joist has a 2½-inch-deep by 4-inch-long notch cut into its top edge to clear a downspout. The guardrail is 34 inches high with balusters spaced 5 inches apart. The buyer plans to add a hot tub rated at 6,000 pounds filled. The seller says the deck “passed inspection when built.” The inspector sees no rot at the ledger but cannot see the back of the siding or the band joist. The home is in a region with 30 psf ground snow load.
1. Identify and prioritize the structural and safety defects, and explain what the inspector can and cannot conclude.
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Prioritize life-safety and structural items. (1) The ledger is attached through vinyl siding with no visible flashing and a missing lag screw; that can trap water and compromise attachment, and hidden rot cannot be ruled out. (2) The 2x8 joist has a 2½-inch-deep notch at midspan-roughly one-third of its depth-in the middle third of the span, a location and size that raise serious structural concern. (3) The guardrail is 34 inches high with 5-inch baluster spacing; both are safety concerns for fall protection. (4) The planned hot tub adds substantial load. Report these as observed safety/structural concerns and recommend a licensed contractor or engineer evaluate before use. Reasoning: the inspector can identify visible conditions and risk, but cannot determine hidden rot, actual load capacity, or code compliance from a visual inspection. Avoid saying the deck “will fail”; say it needs evaluation.
2. How should the inspector respond to the seller’s “passed inspection” claim and the buyer’s hot tub plan?
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Do not rely on the seller’s past-inspection claim. A prior “passed inspection” is not evidence of current condition, and the inspector did not see that report or the hidden ledger. The report should state the current visible findings and recommend further evaluation. For the hot tub, the inspector should explain that a filled 6,000-pound tub is a concentrated load not accounted for in the original deck evaluation, and that the buyer should obtain a structural evaluation before installation. Reasoning: the inspector’s scope is the visible, accessible condition at the time of inspection; past approvals and future loads are outside it. Being clear about the limitation protects the client and avoids implying the deck is adequate for the tub. If the buyer wants certainty, an engineer’s load analysis is the appropriate next step.