Roof Rafter Terminology

Auxiliary cushon compound.

Roof rafter terminology.

Principal rafter major rafter rarely a chief rafter. Roof live load see snow or non snow. 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. 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.

Eave span length the horizontal length i e. They do for the roof what the joists do for the floor and what the studs do for the wall. Roof dead load the approximate weight of roofing materials. Rafter a vertical sloping timber used to form the shape of the roof the side of a truss.

A principal common rafter roof or double roof. Tlor total length of rafter this is the total length from center of ridge to the facial cut. Hip rafter horizontal run 16 97 valley rafter ridge intersect. Here is a closer look at common roofing terms.

These are short spars that run from a hip to the eves or from a ridge to a valley. Usually land directly on a tie beam. 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. 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. In most cases in this manual tails are added later. 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. They vary in size depending on their length and spacing.

The tops of the. Definitions of rafter span run roof span slope collar ties. Length in plan of the overhang portion of the rafter. Bct 122 roof framing 1 rafter terminology calculations.

Includes illustrations that show roofs have hip rafters ridge boards jack rafters and more. Roof framing involves a lexicon all its own. Ll line length also called lor. A term used to describe a pitched roof the ends of which are also sloped.

Lor length of rafter this is the mathematical length from the center of the ridge to the outside of the wall. Rafter the members making up the main body of the framework of all roofs are called rafters. Common rafter terminology. Interior span length the horizontal length i e.

Definition of valley rafter or cripple jack rafter. Being smaller than a principal rafter. In the sketch above the valley rafter is drawn in yellow. Length in plan of the rafter from a structural beam or wall to another structural beam or wall.