Reach for the wrong style of machine and a job that should take a morning can stall before the platform ever leaves the ground. Tracked spider lifts and conventional boom lifts both put a worker at height, but they get there in very different ways, and the right choice usually comes down to how you get the machine onto the ground you want to work from. This guide walks through the practical differences that decide the pick — the way each machine travels, the footprint it needs once it arrives, and the load it puts through whatever surface it stands on.
Two machines, two ways of reaching height
A spider lift is a compact, tracked platform that crawls into position on rubber tracks and then deploys a set of outriggers to create a stable base before the boom goes up. It is designed to fold small enough to pass through doorways, gates and narrow side accesses, then unfold into a surprisingly tall reach once it is set up.
A conventional boom lift — whether self-propelled or truck-mounted — is built to drive up to the work and lift from its wheels or from a mounted chassis, generally on firmer, more open ground. Where a spider lift is about squeezing in and setting up, a boom lift is about arriving under its own power and getting straight to work.
Access constraints are the deciding factor
The single question that most often settles the choice is simple: can you physically get the machine to the spot you need to lift from? A spider lift earns its keep exactly where access is the problem.
Spider lifts tend to win where the path to the work is tight or awkward:
- Through-building access, where the folded machine has to fit a standard doorway or lift car to reach an internal courtyard or atrium.
- Landscaped grounds, heritage sites and pedestrian areas where a heavy wheeled machine cannot travel without damaging the surface.
- Narrow laneways, side passages and gated yards that a self-propelled boom simply will not fit down.
- Positions that call for a compact footprint on arrival but a tall or wide-reaching platform once the machine is set.
When a conventional boom is the better tool
Access swings the other way when the ground is open and firm. A self-propelled or truck-mounted boom is usually quicker to deploy across a clear site, can reposition repeatedly without re-setting outriggers each time, and covers ground far faster than tracks crawling in and folding out.
For long runs of repetitive work across a car park, a construction pad or an open industrial yard, that mobility is worth a great deal. A boom that drives from bay to bay keeps the crew productive in a way a machine that has to pack down and crawl to the next position cannot match on open ground.
Floor loading and surface protection
Where the platform stands matters as much as where it reaches. A spider lift spreads its travelling weight across rubber tracks, which lowers the pressure on the surface while the machine is crawling into place, and this is part of why it can cross lawns, tiled floors and finished surfaces that a wheeled machine would mark or crack.
Once set up, though, the picture changes. A spider lift transfers its load into the ground through outrigger feet, and that concentrated point load can be significant, so spreader plates or pads are often needed to protect a slab, suspended floor or paved area and to keep the feet from punching in on soft ground. On any raised or suspended floor the real question is whether the structure can carry both the point loads and the total mass — a matter for the person responsible for the structure, not an assumption to make on the day.
Matching the machine to the reach you need
Access and floor loading narrow the field; the reach envelope finishes the job. Both machine types come in a spread of sizes, and a spider lift that folds through a doorway will have a different working envelope from a large boom built for open sites.
- Confirm the height and the outreach you actually need at the platform, not just the headline working height, because a job at the end of a long horizontal reach behaves very differently from one straight overhead.
- Check the platform capacity for the number of workers, their tools and any materials that have to go up with them.
- Think about set-up space: a spider lift needs room to spread its outriggers, and a tight position that fits the tracks may still not give the feet the spread they require.
- Consider indoor use and emissions — many spider lifts and self-propelled booms are offered in electric or hybrid form for work inside occupied buildings.
Getting the choice right before it costs you
The safest approach is to describe the whole task — the access route, the surface, the reach and the load — rather than asking for a machine by name and hoping it fits. A short conversation about the site usually prevents the wasted trip of a machine that cannot get to the work or cannot safely stand where it needs to.
If you are weighing a spider lift against a boom for a specific job, or working out whether a surface will carry either one, the team at EWP Australia can talk it through with you on 0416 689 689 and help you land on the machine that actually suits the ground you are working from.
This guide is general information prepared by EWP Australia and is grounded in publicly available Australian Standards and Safe Work Australia material. It is not a substitute for the current published edition of the relevant standard or for site-specific engineering advice. Always work from the current standard and consult a competent person for your specific equipment and application.