Gable Roof Load Transfer

The roof decking and sheathing and resist loads applied to the sheathing and transfer loads vertically to support walls or frames.

Gable roof load transfer. For wide gable dormers where the walls will carry herculean loads lvls or steel i beams may need to be inserted into the floor system to hold up the roof. The roof framing must also function as part of the roof diaphragm to transfer lateral loads to the shear walls below. A gable roof is a roof that slopes downward from a central ridge to a building s exterior walls on two sides. On the other two sides the roof terminates in a flat triangular gable.

Supported by lally columns. 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. Three types of load apply to a gable roof. The distance in this case is 12 ft 2 ft 14 ft.

The roof and ceiling diaphragms transfer shear loads to the gable end frame which transfers these loads to the end wall below and into the foundation. The type of roof labeled b is a hip roof. Framing a gable roof building a gable with barge end purlin struts and collar ties. The exterior wall and the headers within will carry all loads from the mid point of the house between the supporting walls to the outside of the house including the roof overhang.

So each lineal foot of wall must carry the loads imposed by a 1 foot wide strip in that 14 ft region. Roof framing typically consists of dimensional lumber rafters or engineered roof trusses. Dead live and wind. The point at which all the rafters are attached to.

When ceiling joists must be overlapped above a load bearing partition the overlap must be at least 3 the type of roof labeled a is a gable roof. And it s in these cases where i take extra care to follow the load path through the first floor and into the foundation with posts framed within bearing walls. The vertical load on the roof is transferred to the walls. To transfer roof loads to the foundation ceiling joists are usually installed.

Loads affect the bracing roof covering. Transfers the load of the roof through the raftersto walls below. When erecting a gable roof which portion of. 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.

Parts of a roof a ridge board is a horizontal member of the roof frame. Ridge beam sits below the rafters. In order to do this the frame relies upon well designed connections to the bearing wall and diaphragms. These are the forces that apply pressure and must be considered in designing a gable roof.