An illustrated guide to roof construction, including basic types of roofs and a roofing glossary

Diagram of a hip and valley roof framing over a white background.
This roof framing diagram illustrates how a hip roof is built. This roof has horizontal battens for tile or metal. CocoDesign999 /

Drive through nearly any neighborhood and you can see that roofs have many different shapes. Houses have gable, hipped, mansard, gambrel, flat, and shed roofs. Many homes combine roof types on one roof. It’s quite common, for example, to see a hipped roof with gable dormers.

Roof shape is one of the key factors in setting the architectural style of a house. Roof shape also dictates how difficult and costly a roof will be to build and how it will serve the house. For example, flat, shed, and, in some cases, gable roofs tend to be relatively affordable to build.

Diagram of different types of roofs, including shed, flat, gable, gambrel, hip, and mansard.
Roofs are built in a variety of shapes. ©HomeTips

Gambrel and mansard roofs offer more head height for attic rooms. Shed roofs are usually the easiest type to connect to an existing roof when adding on.

Roof framing can be simple or complex, depending on the roof. Overhangs, hips, and dormers add greatly to the complexity of the framing.

Stick & Truss Roof Framing

Nearly all roofs are framed using one of two methods: standard “stick” framing or the newer “truss” framing.

Stick-framed roofs utilize individual rafters that span from the top of exterior walls to the ridge.

Illustration of a stick-framed roof, including ridge board, rafter, collar beam, and ceiling joist.
Stick-framed roof is built one member at a time. ©HomeTips

Truss-framed roofs are built from triangular-shaped, pre-made truss units.

Illustration of a truss-framed roof, including web member, chords, and gussets.
Roof trusses are manufactured ready-to-install. ©HomeTips

Gable and hip roofs may be built primarily of trusses; other roof shapes, particularly those with dormers or on houses with cathedral ceilings, attic rooms, or attic storage areas, are stick built. Stick framing creates a triangle between the rafters and ceiling joists. A collar beam adds strength to the triangle at the middle.

Diagram of a stick-framed roof joining joists and rafters, including ridge board and collar beams.
Stick framing combines roof rafters with ceiling joists. Dragana Gerasimoski /

Like wall studs and floor joists, rafters and trusses are spaced every 16 or 24 inches from center to center. Most roofs utilize 16-inch spacings for strength and rigidity. The rafters are usually positioned directly above the wall studs.

A truss is one contiguous double rafter/ceiling joist unit. Truss construction is just as strong but is lighter weight and uses smaller sizes of lumber than stick framing.

Because trusses are carefully engineered units that shouldn’t be cut, they are not a good choice for roofs that may be modified at a later date. And because they have several intermediate support members, they don’t allow for use of the attic space.

Complex roof, like the one shown below, are usually stick-framed.

Hip and valley roof framing with a gabled dormer, including rafters, tails, and ridge board.
Roof Framing Diagram ©Don Vandervort, HomeTips

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About Don Vandervort
Don Vandervort has developed his expertise for more than 30 years as a remodeler and builder, Building Editor for Sunset Books, Senior Editor at Home Magazine, author of more than 30 home improvement books, and writer of countless magazine articles. He appeared for 3 seasons on HGTV’s “The Fix,” served as MSN’s home expert for several years, and is featured as Yelp's home improvement expert. Don founded HomeTips in 1996. Read more about Don Vandervort