The number printed on a roofing bundle is a test result, not a forecast. Three people adjacent to your decision can translate it, and they will usually do it for free.
A denied claim is won or lost on paperwork that still makes sense nine months later. Here is the file to build, the order to appeal in, and the tools that hold up.
Double glazing saves less than most brochures imply and lasts longer than most owners track. The labels, schedules and warranty records that settle both questions.