Roof Framing Definitions

Roof structure definitions support choices for sloped roofs cantilevered roofs cathedral ceiling roofs.

Roof framing definitions.

In this section we ll cover the most. Types of roofs and define common roof framing terms. Roof slope and rigidness are for shedding water and bearing any extra additional weight. Collar ties rafter ties tension beams structural ridge beams.

Some of these can support the roof and prevent ridge sagging and wall spreading. Sometimes found in very large buildings where big rooms resulted in few load bearing walls. The exposed end of a shingle. In profile the framing of a conventional pitched roof forms a triangle.

The primary object of a roof in any climate is protection from the elements. 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. Roofs must also be strong enough to withstand high winds.

More recently a roof truss means a prefabricated structural timber framework delivered to site to form part of a roof. Mirrored pairs of rafters meet at a ridge and are connected across the base by a ceiling joist. Parallel framing member installed horizontally to support floor and ceiling loads. Like wall studs and floor joists rafters and trusses are spaced every 16 or 24 inches from center to center.

The butt of a shingle is the end that faces down roof. Most roofs utilize 16 inch spacings for strength and rigidity.