Gable End Roof Truss

The gable end frame is designed to transfer vertical loads from the roof to the continuous bearing wall below.

Gable end roof truss. For the arrangement of the gable end overhang for the standard roof you lengthen the ridge beam beyond the facade for previously verified length using cut rafters. The gable truss will usually be supplied with vertical webs placed at 2 on centre to facilitate sheathing. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. Another method is to use a gable end frame but to make it match the profile of the adjacent scissor trusses so that the bracing can be installed correctly.

When a roof is framed with prefabricated wood roof trusses the gable endwall is typically framed with an endwall panel supplied by the truss manufacturer that is commonly and incorrectly referred to as a gable endwall truss. Framing a gable roof building a gable with barge end purlin struts and collar ties. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. After that you should fix the cornice board to the end sides of the ridge and the load bearing beams.

Method is to design a balloon framed end wall which will completely eliminate any need for a gable end frame. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used to support the roof sheathing. That rafter outside forms the overhang for the barge boards to fix to and so the soffit boards and ventilation are continuous all the way. The picture above shows the plan view of a gable roof ladder trusses are made up using four noggins bridging at each corner to support a rafter outside the building.

Another way gable end frames are different from trusses placed in the interior of the structure is that frames experience perpendicular wind loads. Then load bearing roof beams fixed to the trusses are extended in the same way.