cethinktbh

Corrugated steel roof covering setup safety What is the best underlayment for metal roof?The spacing of purlins on roofs and girts on wall is usually 4 to 6 ft. Numbers 20 and 22, U.S. Standard gage, are generally used for roofing; No. 24 for siding. Corrugation is a procedure that entails requiring a series of alternating ridges as well as grooves in the steel. Corrugating makes the metal sheets stiffer and also enables a greater span over light-framed timber. In 1837, the French began galvani…