Gable Roof Truss Detail

Structural gable truss standard gable truss an adequate diaphragm or other method of bracing must be present to provide full lateral support of the bottom chord to resist all out of plane loads.

Gable roof truss detail.

The bracing shown in this detail is for the vertical studs only. Building a gabled roof requires basic carpentry tools and skills but as long as you make precise cuts and measurements you ll be able to make a roof for any simple structure. Gable roof framing calculator plan diagram with full dimensions for a good straight fascia add an extra inch or 2 to the tails of all your rafters total length. The gable roof is one of the most popular roof designs due to its attractive symmetrical shape efficiency at shedding water and option for attic space.

A gable truss isn t structural and needs a continuous bearing support underneath such as a beam or wall. A gable truss sits on the end wall of a structure and has vertical studs every 2 feet or 16 inches. Horizontal brace see section a a mitek usa inc page 2 of 2. If a truss roof is used with this method the gable truss is manufactured 3 shorter than the others.

Gable trusses are more expensive than common structural trusses because more lumber is required. Then a 2 4 outlooker is placed over the dropped gable and butted into the side of the adjacent full height truss. Then the barge or fly rafter is attached to the end of the cantilevered outlooker. This condition is prohibited by some building codes because adequate bracing of this condition is difficult and sometimes impossible.

The cleanest look for a gable end with a closed eave is to angle the soffit therefore eliminating the need to resolve the eave at the gable end. A ladder type overhang detail also can be used with the concrete rake beam where the beam is constructed to the same height as the trusses similar to that shown for the cut masonry rake beam in figure 7b. A flat bottom chord gable end frame used with adjacent trusses that have sloped bottom chords see figure b3 42b creates a hinge in the wall gable interface that is below the bottom chord plane diaphragm. Figure 7b shows a continuously reinforced cut masonry rake beam along the top of the gable end wall.

This configuration gives the look of an open eave but it has the same benefits ease of maintenance and energy performance as a closed eave. Ridge work out how wide you want the barge soffit boards. Set out the wall plates to whatever centers you need for your gable roof 400 450 600 or 900 governed by the weight of roof covering ie tiles and cut fix the joists so they are parallel to each other and flush with the back edge of the wall plates.