Parts Of A Timber Roof Frame

Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins.

Parts of a timber roof frame.

The entire roof frame is covered in a thin piece of wood called decking or roof sheathing. The main structural parts of a roof are ceiling joists ridge board jack rafter hip rafter common rafters creeper rafters raking plates out riggers and noggings or last rafter overhang. They provide the support for the external roofing material. Some are cut to fit the plate whereas others in hasty.

The structural relationship between the rafters and the wall is the same in all types of roofs. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. 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 king post roof truss is the simplest of the trusses because of its simple composition. 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. For larger spans and thinner walls this can topple the walls. Roof sheathing material is usually plywood or oriented strand board osb that is just under half an inch.

Pairs of opposing rafters were thus initially tied together by a horizontal tie. 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. Key timber frame terminology. A horizontal timber or metal resting at the peak of the roof.

The wall and the roof. The point at which all the raftersare attached to. Transfers the loadof the roof through the raftersto walls below. Rafters are sloped beams that run from the roof s ridge to the eaves.

A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. The rafters are really functional parts of both the walls and the roof. A composite decking made of solid materials. Ridge beams are long rectangular rigid pieces of wood metal or stone which are placed horizontally along the ridge of the roof.

Like individual slices in a bread loaf bents extend completely through. Wood used in. Parts of a roof a ridge board is a horizontal member of the roof frame. The rafters are not framed into the plate but are simply nailed to it.

A 45 degree flat edge planed or routed along the outer or leading edges of a timber. Each bent forms an end wall in a bay.