Roof Rafter Terminology

Lor length of rafter this is the mathematical length from the center of the ridge to the outside of the wall.

Roof rafter terminology.

A term used to describe a pitched roof the ends of which are also sloped. Rafter the members making up the main body of the framework of all roofs are called rafters. Hip rafter horizontal run 16 97 valley rafter ridge intersect. Auxiliary cushon compound.

Roof live load see snow or non snow. Application of calculations rafter lengths calculated mathematically. Here is a closer look at common roofing terms. Bct 122 roof framing 1 rafter terminology calculations.

Definitions of rafter span run roof span slope collar ties. 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. The tops of the. Principal rafter major rafter rarely a chief rafter.

Roof framing involves a lexicon all its own. A principal common rafter roof or double roof. Interior span length the horizontal length i e. In the sketch above the valley rafter is drawn in yellow.

Common rafter minor rafter. Definition of valley rafter or cripple jack rafter. Common rafter terminology. Ll line length also called lor.

Rafter a vertical sloping timber used to form the shape of the roof the side of a truss. Roof dead load the approximate weight of roofing materials. They do for the roof what the joists do for the floor and what the studs do for the wall. In most cases in this manual tails are added later.

They vary in size depending on their length and spacing. 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. Rafters are inclined members spaced from 16 to 48 inches apart. These are short spars that run from a hip to the eves or from a ridge to a valley.

A bearing timber forming part of a suspended timber floor to which the floor boards are nailed to the top and a ceiling may be attached beneath or. When repairing or replacing a roof it pays to be familiar with these terms. 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. Eave span length the horizontal length i e.

Usually land directly on a tie beam. Includes illustrations that show roofs have hip rafters ridge boards jack rafters and more. Tlor total length of rafter this is the total length from center of ridge to the facial cut. 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.