Roof Framing Definitions

Mirrored pairs of rafters meet at a ridge and are connected across the base by a ceiling joist.

Roof framing definitions.

Roof structure definitions support choices for sloped roofs cantilevered roofs cathedral ceiling roofs. Sometimes found in very large buildings where big rooms resulted in few load bearing walls. Types of roofs and define common roof framing terms. In profile the framing of a conventional pitched roof forms a triangle.

The butt of a shingle is the end that faces down roof. In this section we ll cover the most. Some of these can support the roof and prevent ridge sagging and wall spreading. Quite common until the 1920 s the function of a roof truss is to support the purlins.

With wood shingles or shakes this is the thicker end. Like wall studs and floor joists rafters and trusses are spaced every 16 or 24 inches from center to center. Collar ties rafter ties tension beams structural ridge beams. Most roofs utilize 16 inch spacings for strength and rigidity.

The rafters are usually positioned directly above the wall studs. Roofs must also be strong enough to withstand high winds. A beam placed perpendicular to wall suds above doors windows or other openings to carry the weight of structural loads. Roof slope and rigidness are for shedding water and bearing any extra additional weight.

The exposed end of a shingle. Parallel framing member installed horizontally to support floor and ceiling loads.