A weaving shed is a distinctive type of mill developed in the early 1800s in Lancashire, Derbyshire and Yorkshire to accommodate the new power looms weaving cotton, silk, woollen and worsted. A weaving shed can be a stand-alone mill, or a component of a combined mill. Power looms cause severe vibrations requiring them to be located on a solid ground floor. In the case of cotton, the weaving shed needs to remain moist. Maximum daylight is achieved, by the sawtooth "north-facing roof lights".