Roof Structural Members

Straps and different types of bracing.

Roof structural members.

The space between each truss is known as a bay. 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. A purlin is a horizontal piece of timber or metal which supports the roof s rafters or decking and helps to prevent your roof from sagging. A slab is usually several inches thick and supported by beams columns walls or the ground.

Purlins horizontal members connecting rafters. Rafters sloped parts of the truss running from the wall beams on both sides to a ridge board which is a horizontal member on top of the roof. One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads. Rafters are sloped beams that run from the roof s ridge to the eaves.

The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart. It is a horizontal structural component with top and bottom surfaces parallel and near. A waterproofing seal installed along the roof s valley line with taktekkernbergen no. A slab is a structural component that is used to create flat horizontal surfaces such as floors roof decks and ceilings.

Rafters have a tendency to flatten under gravity thrusting outwards on the walls. They provide the support for the external roofing material. In the uk a concrete tiled roof would normally have rafters at 600 mm 24 in centers roof battens at 300 mm 12 in centers and ceiling joists at 400 mm 16 in centers. The roof system consists of several very important parts.

When these framing members have been omitted and when there is no structural ridge design over which a roof is suspended the inwards force on the upper roof combined with the downwards movement of the ridge will pull the lower half or more of the rafter away from the ridge board. A waterproofing layer that protects the roof valleys from leaking. Pairs of opposing rafters were thus initially tied together by a horizontal tie. Tie beams connecting each pair of the opposite rafters.