a method of facing a roof structure includes securing a facing to respective lower flanges of first and second spaced - apart purlins of the roof structure , with the facing extending directly between the respective lower flanges of the first and second purlins . a carriage is suspended from purlins of the roof structure and supports a roll of facing . the facing is dispensed and adhesively secured to the purlins by moving the carriage relative to the purlins and / or by maintaining the carriage in a stationary position and pulling facing from the roll of facing supported on the carriage . the resulting faced roof structure provides an enhanced appearance and more uniform and higher r - value insulation .