Residential Roof Framing Plan

The size of the ridge board and hip and valley rafters.

Residential roof framing plan. Known as prescriptive framing. Also different architectural styles will use the same type of roof. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters and panel sheathing products. Continuing on from part 3.

The run or half the building span is the base of the triangle. Similar prescriptive design aids and efficient framing practices can be found in cost effective home building. It is the form most commonly used by. Framing must transfer all gravity uplift and lateral loads to the foundation.

Depending on how wide the home is you can divide the total length in feet by two to determine how many trusses will be needed. For most load bearing requirements a roof truss will need to be placed every two feet along the walls. For high wind conditions prescriptive guidelines for design and construction may be found in the wood. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members. Within limitations which include among others building size roof pitch and design loads the allowed span for conventional rafters can be selected from tables rather than designed through engineering calculations. A design and construction handbook nahbrc 1994. More complex roof designs will need to account for this accordingly.

And the line length measurement from the roof peak to the building wall is the hypotenuse. You will then have to choose between two very different types of roof framing stick framing vs. The rise or height of the roof at its peak is the altitude of the triangle. Common types of roofs and basic framing terms.

Let s consider a basic gable wood roof framing design. In buildings including residential structures framing systems typically consist of the roof structure that supports the roof. Deck exterior and interior load bearing walls beams girders posts and floor framing. The provisions for prescriptive roof construction are found in chapter 8 of the irc and in section 2308 of the ibc.

Intricate roofs have many parts that incorporate several of the basic roof designs such as a gable roof sitting atop a gambrel or variations of the gable valley roof design using one or a variety of different types of roof trusses also see our very detailed diagrams showing the different parts of a roof truss. As you can see the initial plan for framing your roof needs to take into account several key variables such as the shape of the roof and any relevant community building codes. An example of each is shown in figure 2 1. Here we have a wood framed gable roof.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.