Author: Justin Rose

From the street, a new roof is just shingles. Underneath them sit five or six other layers, and most leaks start where one of those was skipped or rushed. The estimate for a replacement usually lists each part by name. Owners who go to website product pages for those items can see what each one looks like before the crew shows up.Down to the WoodA full replacement starts with tear off. The old shingles and underlayment come off in strips, straight into a dumpster or trailer, until only the wooden deck is left.That deck gets walked and checked. Plywood, or…

The capacity listed on a jib crane nameplate isn’t always the weight it can safely lift under real, everyday working conditions. Understanding the gap between rated capacity and actual usable capacity is essential for avoiding overloading a system that technically “should” be able to handle a given load.What Rated Capacity Actually MeansRated capacity refers to the maximum load the crane’s structure and components are certified to handle under specific, defined conditions.It’s typically measured at the crane’s maximum boom length and at a standard operating angle.The figure assumes the crane is used with standard, unmodified rigging and attachments.Rated capacity is a…

Steel doesn’t usually fail because someone picked the wrong grade. More often it fails because nobody ran a charpy impact test at the temperature the part would actually see in service. A batch of plate can pass every check on the shop floor, machinable, weldable, tensile numbers sitting comfortably within spec, and still snap like glass months later on a platform through a cold winter. Nothing about the material changed between those two moments. The temperature did. The problem with testing at room temperature only Most mechanical properties don’t swing wildly with a shift in temperature. Toughness is different. A…