19 Parts of a Roof on a House (Detailed Diagram)

Nice roof on large house.

Custom cross-section diagram of a house roof showing the many different parts of a residential roof including structural parts, the various layers, exterior and various roof features such as skylight and chimney.

Like many aspects of a home, a roof is fairly complex. There are quite a few parts of a roof on a home including different layers and features.

Below we created a very helpful custom diagram that illustrates the various features and layers of a typical roof. For more information about roofs, check out our types of roofs article and diagrams.

Related: Hip Roof Styles | Homes with Gambrel Roofs

Parts of a house roof diagram

Ridge Board: A horizontal timber or metal resting at the peak of the roof. The rafters and trusses are connected to the ridge board for a cohesive framework.

Solid Decking: A composite decking made of solid materials. It resembles real wood and particularly strong and stable for bearing heavy load.

Felt Underlayment: It is a waterproofing layer made of regular felt, stacked above the solid decking board and then completely covered by the shingles or other roofing materials.   

Shingles: Roof covering typically of flat and rectangular shapes and made of various materials such as slate, wood, flagstone, plastic, metal and composite materials.

Vent Pipe Flashing: An external installation on the roof that uses the vent pipe system to prevent water seeping in and create damage.

Skylight: A window installed on the roof or ceiling for the purpose of daylighting.

Chimney Flashing: A waterproofing seal installed at the intersection of the roof and chimney and used to prevent moisture penetration.

Chimney: A vertical structure through the roof that ventilates smoke and combustion gases from a fireplace, boiler or stove to the outside atmosphere.

Collar Beam: The horizontal beam connecting two rafters that intersect at the ridge.

Rafter: One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads.

Valley Flashing: A waterproofing seal installed along the roof’s valley line with

Valley Underlayment: A waterproofing layer that protects the roof valleys from leaking.

Spaced Sheathing: Also called Skipped Decking, it refers to the installation of the flat panels by spaces apart and results to a ladder-type appearance.

Fascia: The sheath covering the ends of the rafters.

Lookout: The horizontal joist projecting in cantilever from the wall plate.

Rake: The inclined sides of a gable end.

Gutter: A duct for water discharge system for a building.

Downspout: The channel that transports rainwater from the gutter.

Splash Block: Found underneath the downspout and used to transport the rainwater from the gutter in a direction away from the house.




↓ Next Post Below

CLICK HERE for Free Design SoftwareTry our free 3D home/room design software.

HAUS Naturals Stainless Steel Cleaner
Roof styles and designs featured image chart

36 Types of Roofs (Styles) for Houses (Illustrated Roof Design Examples)

Chart showing the different types of bar glasses

27 Types of Bar Glasses (Illustrated Chart)