Flat Roof Firrings are precision-cut tapered timber lengths used to create the correct fall on flat roofs. By gently raising one side of the roof surface, firrings ensure proper rainwater drainage, helping prevent standing water and improving the long-term performance of the roof structure. They are an essential component for warm roofs, cold roofs and timber-framed flat roof systems.

Our firrings are ideal for extensions, garages, garden rooms, sheds, workshops, timber outbuildings, and flat-roof refurbishments. Easy to fix directly onto joists, they provide a smooth, even fall ready for insulation boards, plywood, OSB decking or roofing membranes.

Machine-cut for consistent gradients and smooth tapering, these firrings save time on site and offer a cleaner, more accurate finish than cutting your own. Whether you’re installing a new flat roof or upgrading an existing structure, they help achieve reliable drainage and a professional result.

At TimberOnline (Nottage Timber Merchants), we supply high-quality Flat Roof Firrings manufactured with accuracy and consistency in mind — giving you dependable materials for both domestic and trade roofing projects.

Note: Always ensure your flat roof has the correct minimum fall as recommended by roofing manufacturers to prevent ponding and maximise lifespan.