Lumber Size. It is not necessarily the best practice to buy smaller lumber that just meets span code requirements. Using the next bigger size makes for a stronger roof structure–especially in heavy snow load locations. Spacing. Most roof rafters are spaced at 24” on center if possible to ...
If you picked the rise, all you need to do is input its value, put in the roof's run, and the calculator will return the rafter length in the bottom-most field. 💡 Please note that the rafter length calculator works both ways, that is, you can also use it to calculate the rise...