The Stairs Built With Glue Instead of Fasteners

Every so often a deck inspection turns up a shortcut so unusual it takes a second look to actually register. On a fairly good-looking, newly built deck in Muskoka, the treads on the staircase weren’t really fastened down at all — they were glued in place with flooring adhesive.

A few finishing nails held the outer stringers together just long enough for the adhesive to cure, but the only actual fasteners on the stair treads themselves were single toe-nailed screws per plank — and screws aren’t the right fastener for stair treads to begin with, let alone as the sole mechanical connection.

Stairs experience dynamic, repeated impact loading every time they’re used — nothing like the static load a glued flooring joint is designed for. Adhesive alone, without proper mechanical fastening into solid framing, isn’t rated for that kind of repeated shock loading, and it’s not something that fails gradually with an obvious warning sign. It’s the kind of shortcut that can look completely fine on the surface right up until it doesn’t.

The broader point: stairs are one of the least forgiving elements of a deck to get wrong, precisely because failures there tend to be sudden rather than gradual. If a staircase looks unusually quiet or rigid in a way that’s hard to explain, it’s worth checking exactly what’s holding the treads on before trusting it with real foot traffic.