Gable Roof Load Transfer

They transfer loads from above to the foundation below through a network of structural elements.

Gable roof load transfer.

The gable end frame is designed to transfer vertical loads from the roof to the continuous bearing wall below. When building a structure it is important to calculate wind load to ensure that the structure can withstand high winds especially if the building is located in an area known for inclement weather. The roof sheathing supports gravity loads such as the roof live load snow load and vertical uplift loads. Also the roof sheathing working in conjunction with the roof framing must function as a diaphragm to transfer lateral loads to the building s shear walls.

The roof framing must be able to bear the dead load plus the maximum anticipated live load and adequately transfer that load downward through the structure to the ground. The webs are studs oriented vertically and usually spaced at 12 16 or 24 in. Manufactured gable ends are actually frames even though they are often referred to as trusses. Hip roof a hip is a type of roof where all sides slope downward to the walls.

Whenever adding any type of dormer it s essential to determine the roof load and design the load path transfer to the existing floor joists or roof rafters. No hips or valley s. Soffit is the underside of a roof balcony or over hang. Gable roof a gable roof is when all rafters extend downward from the ridge board beam.

Three types of load apply to a gable roof. These are the forces that apply pressure and must be considered in designing a gable roof. Framing a gable roof building a gable with barge end purlin struts and collar ties. Loads affect the bracing roof covering.

Live loads and. Engineered roof truss systems may be designed to eliminate the need for load bearing walls or change where the bearing walls are located. Created by wind pressures. It wouldn t be a bad idea to consult a structural engineer for guidance especially on larger dormers.

15 psf x 14ft 210 pounds per lineal foot. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. 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 default roof in archicad.

Add together all live loads and dead loads that act on the member and then choose a material that will resist the load. The idea behind sizing headers and beams is straight forward. 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. Then you can ensure adequate bearing points or add framing and install beams to carry the loads through the walls down to the foundation.