In addition, rafter sizing is expressed as a ratio of the roof’s rise to the run (half of the space) or a fraction of the rise over the run. As well as, the 2″×4″ lumber could span from 7 to 9 ft. The most typical available lumber sizes used in roof framing embrace 2″×6″, giá xây nhà trọn gói tại Quảng Nam 2″×8″, 2″×10″, 2″×12″, and 2″×14″ used in roof framing.