The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.
Residential roof framing plan.
More complex roof designs will need to account for this accordingly.
You will then have to choose between two very different types of roof framing stick framing vs.
Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters and panel sheathing products.
For high wind conditions prescriptive guidelines for design and construction may be found in the wood.
Common types of roofs and basic framing terms.
A design and construction handbook nahbrc 1994.
Let s consider a basic gable wood roof framing design.
Gable a gable roof has a ridge at the center and slopes in two directions.
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.
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.
For most load bearing requirements a roof truss will need to be placed every two feet along the walls.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Also different architectural styles will use the same type of roof.
The run or half the building span is the base of the triangle.
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.
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.
Roof framing plans are usually required for complicated residential roof shapes and for most commercial projects.
The rise or height of the roof at its peak is the altitude of the triangle.
A roof framing plan shows the size and direction of the construction 425 figure 20 1 the shape of the roof can play an important role in the design of the structure as seen in this home by the architect robert roloson.
Here we have a wood framed gable roof.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
Similar prescriptive design aids and efficient framing practices can be found in cost effective home building.
In buildings including residential structures framing systems typically consist of the roof structure that supports the roof.
Continuing on from part 3.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
Deck exterior and interior load bearing walls beams girders posts and floor framing.
