A typical firring strip is cut from regulated timber.
These firrings have originated from a piece of 2" treated timber (47mm x 47mm) 3.6m long.
Please note that the cut edge will be untreated.

This piece of timber, has been cut along the diagonal to create 2 timbers 40-38mm down to 2mm.

Firrings are used to create an angle in the construction of flat roofs to ensure water run off.
Please see our video for more information.

This is for one firring.