Parts Of A Timber Roof Frame

They provide the support for the external roofing material.

Parts of a timber roof frame.

Each bent forms an end wall in a bay. The structural relationship between the rafters and the wall is the same in all types of roofs. Wood used in. The wall and the roof.

The rafters are really functional parts of both the walls and the roof. The entire roof frame is covered in a thin piece of wood called decking or roof sheathing. Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins. In a nutshell it s made up of a central vertical post called the king post two rafters meeting at the apex and a tie beam or the horizontal base.

Some are cut to fit the plate whereas others in hasty. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. A horizontal timber or metal resting at the peak of the roof. Transfers the loadof the roof through the raftersto walls below.

The space between each truss is known as a bay. A 45 degree flat edge planed or routed along the outer or leading edges of a timber. The rafters are not framed into the plate but are simply nailed to it. It is often used in simple roof trusses such as in the shed porch and garage.

Pairs of opposing rafters were thus initially tied together by a horizontal tie. Parts of a roof a ridge board is a horizontal member of the roof frame. Like individual slices in a bread loaf bents extend completely through. The king post roof truss is the simplest of the trusses because of its simple composition.

The point at which all the raftersare attached to. Key timber frame terminology. Roof sheathing material is usually plywood or oriented strand board osb that is just under half an inch. Rafters are sloped beams that run from the roof s ridge to the eaves.

Ridge beams are long rectangular rigid pieces of wood metal or stone which are placed horizontally along the ridge of the roof. For larger spans and thinner walls this can topple the walls. Decking is supported by the roof frame and the layers of a roof which we cover below and all rest on top of the decking. It resembles real wood and particularly strong and stable for bearing heavy load.

Tie down fixings tie down fixings are used to resist uplift and shear forces lateral loads in floor framing wall framing and roof framing. The rafters and trusses are connected to the ridge board for a cohesive framework.