If you're buying Correx for temporary floor protection, you'll see plenty of products described in much the same way: 2mm Correx, 8 × 4 sheets, black fluted polypropylene.
That can make it look as though you're comparing exactly the same product from one supplier to another. But does 2mm Correx from one supplier necessarily have exactly the same specification or performance as 2mm Correx from another?
No.
The 2mm measurement tells you the thickness of the board. It doesn't, by itself, tell you everything about how the board has been made, how much material it contains, its weight per square metre, or whether it is the right grade for the job you're doing.
That matters when you're comparing both quality and price. Before deciding that one sheet is better value than another, it helps to understand what you're actually comparing.
What Does 2mm Correx Actually Mean?
The 2mm measurement refers to the nominal thickness of the polypropylene board.
Correx is made from polypropylene in a twin-wall construction. Rather than being a solid 2mm-thick piece of plastic, the board consists of two relatively thin outer walls connected by internal flutes. This construction is one reason it can be lightweight while remaining sufficiently rigid for applications such as temporary surface protection.
Polypropylene itself is widely used because of properties including toughness and good chemical resistance. The British Plastics Federation's guide to polypropylene provides a useful overview of the material and its physical characteristics.
The important point when buying Correx is that thickness is only one specification.
Corplex, the manufacturer of genuine Correx®, lists thickness and grammage separately in the technical specifications for its fluted polypropylene sheets. Its Correx ranges begin at 2mm thickness, while grammage is specified separately in grams per square metre.
In other words, asking whether a board is 2mm thick doesn't answer every question about the board.
What Is GSM in Correx?
GSM means grams per square metre. It tells you how much a square metre of the material weighs. This is different from thickness.
Imagine two protection boards that occupy approximately the same amount of space and are both described as 2mm thick. Their thickness specification alone does not tell you the complete material specification.
This distinction isn't unique to Correx. Manufacturers of fluted polypropylene commonly specify both thickness and grammage because they describe different characteristics of the sheet.
So when comparing Correx, it can be useful to ask:
| Specification | What it tells you |
|---|---|
| Thickness | The depth of the board |
| GSM / grammage | Weight of material per square metre |
| Sheet dimensions | How much area each sheet covers |
| Material | What the board is made from |
| Additional properties | Whether it has properties such as flame retardancy, UV treatment or anti-static performance |
| Intended use | Whether the product is suitable for the protection job you have in mind |
The key point is simple: 2mm is a thickness measurement, not a complete quality specification.
Does a Higher GSM Mean Better Correx?
Not automatically. This is where comparing building supplies can become misleading. It is tempting to turn every specification into a quality score and assume that a bigger number must mean a better product.
More material may affect characteristics such as weight and rigidity, but the best protection board is the one appropriately specified for the job you're doing.
A decorator protecting finished flooring during painting has very different requirements from a contractor protecting a surface through weeks of heavy multi-trade traffic.
If a lighter protection board performs perfectly well for your application, paying substantially more for a heavier or thicker product may not give you much practical benefit. Equally, using protection that is too light for a demanding application can prove a false economy if it needs replacing or allows the surface underneath to become damaged.
You need to be asking "What specification do I actually need for this job?"
Is 2mm Correx Good Enough for Floor Protection?
For many common trade applications, 2mm fluted polypropylene protection board is a practical choice for temporary floor and surface protection.
Typical uses include decorating, painting, refurbishment, property maintenance and other jobs involving relatively light site traffic.
For heavier site conditions, longer projects or areas where equipment and substantial loads will regularly pass over the protected surface, a contractor may decide that a thicker or otherwise more robust protection system is appropriate.
We've covered this question in more detail in our guide to the maths of Correx and choosing the right protection for a project.
The point is that you don't need to buy the heaviest protection available simply because it exists. You need sufficient protection for the risks on the job.
How Do I Compare Correx Products?
If two suppliers are offering you 2mm Correx, don't compare the headline price until you've established that the products are sufficiently similar for your needs.
Start with the basic specification.
- Check the dimensions. A standard full-size trade protection board is commonly around 2400 × 1200mm. Smaller sheets can obviously have a lower unit price while giving you less coverage.
- Check the thickness. Make sure you're comparing 2mm with 2mm rather than comparing a cheaper 2mm product with a heavier-duty 3mm or 4mm board.
- Ask whether the grammage or sheet weight is available. Because thickness and grammage describe different characteristics, this gives you another useful piece of information about what you're buying.
- Check the material and intended application. Correx is a fluted polypropylene product, but polypropylene sheets can be manufactured in different grades and with different properties. Corplex, for example, offers Prime, Recycled and Certified Correx ranges as well as optional properties including anti-static, ESD, flame-retardant and UV options.
- Consider what you actually need it to do. Floor protection for a quick decorating job and protection for a busy commercial refurbishment are different buying decisions.
- And, compare the delivered cost, rather than looking at the board price in isolation. Delivery charges, minimum quantities and the quantity you actually need can all change which option offers the best value.
Does More Expensive Correx Mean Better Correx?
Absolutely not. Price on its own tells you almost nothing about the technical specification of a protection board.
We found this particularly interesting when we conducted our 2026 UK Correx floor protection price comparison.
To make the comparison as useful as possible, we narrowed it to published prices for standard black fluted polypropylene protection boards with the same core dimensions and thickness: 2400 × 1200 × 2mm.
Despite that, the published prices we found ranged from £1.75 to more than £5 per sheet excluding VAT.
A higher price could sometimes reflect a different specification, service level, order quantity or delivery arrangement. That's why those things need to be checked. But the price itself isn't evidence that the board is stronger, heavier or better suited to your job.
We've seen the same issue in the real world. In Am I Paying Too Much for Building Supplies?, we looked at the case of a builder buying around 500 sheets a month who had been paying approximately £2.80 per sheet for years. An alternative at £1.80 delivered represented a potential difference of £500 per month, or £6,000 per year.
The lesson wasn't that you should always buy the cheapest Correx.
It was that you shouldn't assume the price you're accustomed to paying tells you what a product is worth.
What Else Can Affect the Performance of a Correx Board?
The polypropylene itself is only part of the story. Fluted polypropylene is an engineered sheet rather than simply a flat piece of plastic.
The Corplex technical information for Correx shows how extensive the possible specifications can be. Its fluted products are available across different thicknesses, grammages and material ranges, with additional options such as flame retardancy, UV protection and anti-static properties.
The British Plastics Federation also notes that polypropylene itself is available in different grades and that additives can be used to alter end-use performance. Its technical overview of polypropylene describes PP as tough and chemically resistant, while explaining that different grades are selected according to the application.
For an everyday temporary floor-protection job, you may not need specialist properties at all. But this illustrates why "it's 2mm polypropylene" doesn't completely describe a product.
Should I Buy 2mm, 3mm or 4mm Correx?
Choose based on what is happening on top of the protection, what you're protecting underneath it and how long the protection needs to remain in place.
Let's take the lightest work...For decorating, painting and many residential refurbishment applications with light foot traffic, 2mm protection board can provide an economical solution.
As traffic, duration and risk increase, thicker or more robust protection may become appropriate. If multiple trades, heavy equipment or significant loads will regularly move across the area, don't choose purely on price.
There's a simple commercial principle behind this:
Under-specifying protection can be expensive, but over-specifying every job can also be expensive.
The goal is to use the appropriate protection for the risk.
How Much Area Does a Standard Correx Sheet Cover?
This is another useful number when comparing prices.
A 2400 × 1200mm board covers 2.88m² before allowing for cutting, overlaps and waste.
That means a £2.00 sheet costs about 69p per m² of coverage, while a £4.00 sheet costs about £1.39 per m².
For larger projects, comparing cost per square metre can make differences much easier to see than comparing individual sheet prices.
If you're trying to calculate how many sheets you'll actually need, see our guide to how much Correx you need for a 150m² house.
What Should I Ask Before Buying 2mm Correx?
You don't need to become a plastics engineer to buy floor protection. For most contractors, a few straightforward questions will tell you far more than simply looking at the price.
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What are the exact sheet dimensions?
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Is it actually 2mm?
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What material is it made from?
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Is the GSM or sheet weight available?
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Is it intended for temporary floor and surface protection?
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Do I need any specialist properties for this particular job?
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How much area does each sheet cover?
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What's my real delivered price?
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Is 2mm sufficient for the traffic and work taking place on this project?
If you're comparing suppliers, ask the same questions of each one. That gives you a much better basis for deciding whether a cheaper product represents genuine value or whether you're comparing two different specifications.
So, Is All 2mm Correx the Same?
No. While they may be similar, they are not the same. Two products being described as 2mm Correx does not tell you that every aspect of their specification is identical.
Thickness tells you the nominal depth of the board. It doesn't tell you the complete grammage, grade, additional properties, dimensions or suitability for a particular job.
At the same time, don't fall into the opposite trap and assume that heavier, thicker or more expensive automatically means better.
If you're protecting a floor, the objective isn't to buy the Correx with the biggest number attached to it. It's to buy protection that is properly suited to the work taking place, at a sensible delivered price.
At Trades International, that's how we think contractors should compare protection materials: understand the specification and the job, and then see just how big our value is.
Our TI-Pro® 2400 × 1200 × 2mm Protection Boards are made from recycled polypropylene and designed for temporary surface protection during construction and renovation.
If you're still deciding what you need, you can also read our Correx Floor Protection Price Comparison 2026 or The Maths of Correx for more on quantity, cost and choosing protection for a project.
Last reviewed: September 2026. This guide is based on published manufacturer technical information, publicly available product specifications and Trades International's experience supplying temporary protection products to UK trades.