Roof Rafter Terminology

Eave span length the horizontal length i e.

Roof rafter terminology.

A term used to describe a pitched roof the ends of which are also sloped. Definition of valley rafter or cripple jack rafter. Ll line length also called lor. Definitions of rafter span run roof span slope collar ties.

Rafters are inclined members spaced from 16 to 48 inches apart. Usually land directly on a tie beam. Roof live load see snow or non snow. Common rafter minor rafter.

Interior span length the horizontal length i e. Rafters on opposite sides of the ridge should be installed directly opposite each other in pairs although if you see a few that don t align it s really not a defect. Common rafter terminology. Rafter the members making up the main body of the framework of all roofs are called rafters.

Application of calculations rafter lengths calculated mathematically. Bct 122 roof framing 1 rafter terminology calculations. Length in plan of the rafter from a structural beam or wall to another structural beam or wall. Roof dead load the approximate weight of roofing materials.

The tops of the. Roof framing involves a lexicon all its own. Length in plan of the overhang portion of the rafter. Lor length of rafter this is the mathematical length from the center of the ridge to the outside of the wall.

They vary in size depending on their length and spacing. Ridge the horizontal line at the top of a pitched roof applies whether there is a sloping roof on both sides a duo ridge or if there is just one a mono ridge. Auxiliary cushon compound. Tlor total length of rafter this is the total length from center of ridge to the facial cut.

Being smaller than a principal rafter. A principal common rafter roof or double roof. Rafter a vertical sloping timber used to form the shape of the roof the side of a truss. These are short spars that run from a hip to the eves or from a ridge to a valley.

Includes illustrations that show roofs have hip rafters ridge boards jack rafters and more. Here is a closer look at common roofing terms. A rafter extending from the roof ridge down to the top plate of a wall at the intersection of a gable extension roof that itself abuts or intersects with the main roof. Rafters which rest on the outside walls at the bottom and connect to the ridge at the top are called common rafters highlighted here in yellow.

Principal rafter major rafter rarely a chief rafter. In the sketch above the valley rafter is drawn in yellow. Hip rafter horizontal run 16 97 valley rafter ridge intersect. In most cases in this manual tails are added later.