Portable Rollforming Equipment has found welcomed acceptance in today's thriving metal roofing industry. Many roofers find this equipment to be as as indispensable as a pair of 'snips'. In the past ten years, this type of machinery has matured and kept pace with today's demands.
Roof pitch is measured "rise over run". This is measured by taking a level and placing it at any point on the slope of the roof. Now take a measuring tape (or scale) and measure straight down to the roof at the 12" mark on the level.
Power seamers can double lock as fast as 30 feet per minute (fpm) and single lock as fast as 45 fpm. Why, then, would it be necessary to use a hand seamer? There are several conditions where hand seaming is appropriate or preferred.
To minimize movement of roofing panels a combination of fixed cleats and expansion cleats are required. The top part of an expansion cleat can slide back and forth in the base allowing the metal to expand and contract.