Plant rooms, risers and service cupboards are where protection gets bought out of habit. These spaces usually have a functional floor, no client visibility and no decorative finish, and covering them is spending money on a problem that does not exist. The useful skill here is recognising the exceptions.
The default answer is nothing
A poured or screeded plant room floor with a sealed or painted finish is designed to be walked on, dragged over and stood on. It does not need protection and it will not be judged at handover. The traffic in it is plant and maintenance, not visitors. Covering it is wasted budget and wasted labour.
When it does matter
Three cases. Where the plant room floor is the same finish as an adjacent client area and the two are continuous – the damage will be seen. Where heavy plant is being installed and the loads exceed what the floor is designed for – that is a load-spreading job, not a protection job. And where a riser opens directly onto a finished corridor, in which case the junction and the route matter – and where a short run of cheap sheet across that junction is usually the entire requirement.
Heavy plant is a load problem
Air handling units, boilers and chillers are heavy and often on feet. The floor under them takes a standing load it may not have been designed for, and no floor protection changes that. The answer is a plinth or a spreader designed for the load, and it should be specified with the plant rather than bought as protection.
Riser openings onto finished floors
A riser that opens onto a finished corridor means everything going in and out crosses the finish, usually through a narrow door. That junction is worth protecting properly – a ramped threshold and a run into the riser – while the riser floor itself is not worth anything.
What to spend the money on instead
Load-spreading plates under plant feet, a ramped threshold at the riser door, and nothing else. That is usually a small order compared with covering the plant room, and it addresses the two things that actually go wrong in these spaces.
Riser floors and the cable pulling
Cable pulling through a riser drags across the floor at the opening, and a cable under tension is a cutting tool. The junction between the riser and any finished floor outside it needs a proper ramp and a rigid cover, because that is where the damage happens. The riser floor itself, being concrete, does not care.
Fire stopping and the riser
A riser penetration has fire stopping at each floor level, and covering or blocking it during works can leave a compartmentation gap that nobody reinstates. Whatever goes in a riser has to leave the fire stopping visible and intact, and it has to be checked before the riser is closed up. This is a compliance matter rather than a finish matter.
What to record
Where plant is being installed over a finished adjacent floor, record the load, the foot layout and the spreading detail before the lift. If there is a dispute later about floor damage, the calculation is the answer, and it is far easier to produce from a note made at the time than from memory.
A PP honeycomb panel under a plant foot spreads the load, which is the one thing worth buying in a plant room. Corrugated PP sheet does not spread anything and should not be used under machinery.
What we can do
We supply corrugated PP sheet for the cases that need dust protection and load-spreading honeycomb panels for plant feet, and we will tell you when neither is needed. Tell us what the floor is and what is going into the room, and we will say plainly whether protection is worth buying. Load behaviour is covered in protecting floors under machinery during installation.