CORREX® FIRE RATED Protection Sheet Boards – 4mm Thick

Correx fire rated protection sheet boards in 4mm thickness are the go-to choice on sites where you need a lightweight, durable protective layer that also meets fire safety requirements. Available in the standard 8ft x 4ft size (2.4m x 1.2m), these 4mm fire-rated Correx boards are made from twin-wall fluted polypropylene, giving them a rigid but slightly flexible structure that handles knocks, foot traffic and general site abuse without cracking or tearing. If you have ever had a standard protection sheet cited during a fire inspection, switching to a fire rated variant removes that problem entirely.

Correx is a registered trademark of Corplex, and the fire rated version of the board carries the same handling characteristics you would expect from the standard product. It cuts cleanly with a knife or scissors, tapes without specialist adhesive, and can be laid flat or stood upright without losing its shape. The fluted core adds rigidity without adding weight, so one person can carry a sheet easily and position it quickly without the faff of a two-man lift.

Where Fire Rated Correx Boards Are Used on Site

The most common use is floor and surface protection during finishing trades. Correx boards go down over freshly laid tiles, hardwood floors, or screeded surfaces before painters, plasterers, and joiners come through. The fire rated specification makes them suitable for use in commercial buildings, new build developments, and any project where the principal contractor or client requires FR materials throughout the site.

Construction site signage is another straightforward application. The 4mm fire-rated Correx board takes printed overlays, direct printing and hand-painted text, and it holds up outdoors for weeks without delaminating or going limp. Estate agent boards have used Correx as a standard material for years for exactly this reason.

Colour Options and What They Are Used For

These fire rated boards are available in black, grey, white and translucent. White is the most common choice for signage because it gives a clean background for print or hand-finished text. Grey and black tend to be used where appearance matters less and coverage is the priority, such as protecting dark flooring or lining site hoardings. Translucent boards are useful where some light transmission is needed, for example covering glazed surfaces or temporary screening in areas where natural light needs to be maintained.

The 4mm fire-rated Correx board in 2.4m x 1.2m format is available in packs of 50, making them a practical bulk purchase for larger sites or contractors who want to keep stock on hand rather than ordering in small runs. Bulk pricing is available on request, so if you are pricing up a major contract, it is worth getting in touch before you finalise your material schedule.