Tim Carter, founder of Ask the Builder, shows the simple value proposition of the attic trusses used to create a “bonus room” in what traditionally is wood webs, insulation and dead air. He explains that roof trusses were invented in the 1950's and revolutionized the way roofs are framed. Another benefit Tim points out is that today's modern computer software allows for just about any size or shape to be built using roof trusses.