old architecture is the grouping of the gables. Since lead was not available, slate was used in its place.[citation needed] Henry Ford is noted to have appreciated the "distinctive architectural style and attractive weathered appearance of typical Cotswold buildings," whose stone elements "all blended together unbroken by other visible construction materials." Due to the steepness of the roofs, most original Cotswold cottages had dormer windows and were not waterproof.:?32,?46? Occasionally, lead was employed in gutter systems around the roof.:?10? As a result of the roof angles, roofs made with pseudo-thatch, steep arch gables, and arched doorways are all common features of the Cotswold style. Like the roofs, the walls of Cotswold residences were susceptible to the elements. Though the walls were thick, they were hollow and filled with rocks and "rubbish" and were not reinforced with any binding materials. The stone slates were naturally thick. The walls had to compensate by being thicker than the slates in Cotswold traditional houses in order for the building to be supported. The king mullion is a common element of the Cotswold style. The windows of Cotswold cottages were glazed with lead. In smaller structures, the windows were the only elements in which lead was used.:?10? Interiors Buildings of the Cotswold style typically have one or two large fireplaces, depending on the size and function of the building. The fireplaces both release into a chimney. The interiors of the chimneys as well as the mantles are made of stone. The rooms of residence constructed in the Cotswold style are often small and irregularly shaped. The floorplan of a Cotswold cottage is generally bisected by a stairca