A rigid aluminium profile bar that is popular in lean-to-roof construction. The F profile is available in 3mtr and 4mtr lengths and a powder-coated white or brown colour finish. 

In roof construction, the F profile is used on the first rafter and also the last rafter. Shaped like the letter 'F', the multiwall roofing sheet is wedge fitted into the F prong. The stem or leg of the F is then placed flat against the first rafter and the profile can be screw-fitted to the rafter making it secure and non-movable.