Temporary floor protection looks like the simplest application there is – lay sheets on a finished floor, take them up later. On a working site it is one of the more demanding things you can ask of a plastic sheet, and most products sold for it are under-specified.
What actually happens to it
- Point loads. Scaffold feet, ladder feet, wheelbarrow wheels, the legs of a stored material stack. These concentrate a lot of weight onto a small area.
- Abrasion. Grit under the sheet acts as sandpaper between the sheet and the floor. This is the most underrated failure mode, and it damages the floor rather than the sheet.
- Tripping. A sheet edge that lifts is a trip hazard, and on site that matters more than scuffing.
- Liquid. Paint, plaster, grout, rain tracked in on boots. Whatever gets on top eventually gets underneath if the joints are not lapped.
- Traffic over the joints, which is where sheets move, gap and let grit through.
Why corrugated sheet works
It is stiff enough to bridge small irregularities, light enough to handle, cheap enough to be treated as consumable, and it does not absorb water. The flutes give bending stiffness at low weight, and the sheet stays flat rather than curling like a film.
What makes the difference on site
Thickness. Thin sheet curls at the edges and lifts. For floor protection, thicker is genuinely better, because the failure mode is edge lift rather than puncture.
Sealed edges. An open flute at a cut edge collects grit and water and holds them against the floor. Sealed edges are worth specifying.
Taping the joints. Butt-jointed sheets separate. Taped joints keep grit and liquid out, and they stop the edges lifting, which addresses the trip hazard too.
Impact resistance at temperature. Site work happens in winter. PP gets stiffer and more brittle when cold, and a sheet that survives a dropped hammer in August can crack in January.
Mistakes worth avoiding
Laying sheets over grit. Sweeping first costs minutes and prevents most of the scratching the protection was bought to prevent. Using a film rather than a sheet, which tears and bunches. Leaving sheets down far longer than intended, because adhesive residues and trapped moisture can mark some floor finishes.
Floor finish compatibility
Worth checking before committing. Some finishes – certain sealers, fresh screeds, some polished surfaces – can be marked by prolonged contact with a plastic sheet, particularly if moisture is trapped. If the floor is valuable, test a corner first and check with the flooring contractor. This is the kind of thing that is much cheaper to establish beforehand.
Taking it up again
Removal is where damage happens, and it is rarely planned for. Sheets that have been down for months have grit underneath them, and dragging them across a finished floor grinds that grit into the surface – undoing the protection at the last step.
Lift rather than drag, and sweep as you go. Where sheets have been taped together, cut the joints rather than pulling them apart.
Residue is the other issue. Adhesive from tapes and from some anti-slip backings can be difficult to remove from some floor finishes after prolonged contact, and it is worth testing the tape on a small area first. The cheapest protection is worth little if removing it damages what it was protecting.
What we supply
We supply corrugated PP sheet in the thicknesses used for floor protection, with sealed edges available. Tell us how long it needs to stay down and what is going over it, and we will tell you the thickness – and if your floor finish is one of the sensitive ones, we will flag it.