Guard rail post
A short tube pushed onto the legs of the top frames that carries guard rails and toe boards on the last working lift of a frame scaffold.
Also called: handrail post, top post, guard rail standard, guard post, top-lift post
On every normal lift of a frame scaffold, the guard rail hangs on the next frame up. At the very top that frame is missing, and this is where the guard rail post comes in. It is pushed onto the legs of the top frames and extends them by just over a metre, so that guard rail, intermediate rail and toe board have something to attach to on the last working level. Without it, the top lift, where roofers, plumbers and painters often spend the most time, would be open at its outer edge.
The post is sized so that, with its connections, the guard rail ends up at a minimum of 1.0 m over the deck.
Design and variants
At its core the post is a short 48.3 mm tube with a spigot or sleeve at the bottom for pushing onto the frame leg. It carries the side protection connections, depending on the system tilting pins, rail eyes or wedge sockets, and often a bolt or holder for the toe board. It is locked against lifting with an eye bolt, a frame pin or a drop-lock pin.
- Single post: for the outer side of the top lift, usually about 1 m long.
- Post with transom: connects inner and outer leg and also acts as deck lock so the top decks cannot lift.
- Double posts and end guard frames: close the ends, see end guard rail.
- Material: galvanised steel is standard; aluminium saves weight for frequent moves.
Modular scaffolds usually need no separate post: a short standard is plugged on and ledgers are connected at about 0.5 m and 1.0 m as intermediate and top rail.
Fitting
The top lift is decked and the lifts below are tied. Working from the protected area, with advance guard rail or fall-arrest equipment as the risk assessment requires, push the post onto the outer leg until it seats fully. Insert the lock, tighten the eye bolt or push the pin through so the post cannot be lifted out. Fit transom or deck lock if needed, hook in both rails, close pins or strike wedges, put in the toe board and shut the stop ends. Dismantle in reverse while the lift below is still protected.
What to check
- A post that is only pushed on can be lifted out when someone leans on it or hauls up material.
- Tilting pins and eyes must move freely and must not be bent or torn off.
- Scrap bent posts, cracked welds and flared spigot ends.
- Use it as an anchor point only if the instructions explicitly allow it.
- Do not confuse it with the much longer posts of a roof edge protection screen.
When buying used, check spigot, locking screw and thread, zinc coating and pins, and make sure the post fits your frames. See guard rails.