Roof Structural Members

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

Roof structural members.

Straps and different types of bracing. 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. 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 timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.

Tie beams connecting each pair of the opposite rafters. Rafters are sloped beams that run from the roof s ridge to the eaves. Purlins horizontal members connecting rafters. The space between each truss is known as a bay.

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. A slab is a structural component that is used to create flat horizontal surfaces such as floors roof decks and ceilings. A waterproofing seal installed along the roof s valley line with taktekkernbergen no. A waterproofing layer that protects the roof valleys from leaking.

The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart. The roof system consists of several very important parts. 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. Pairs of opposing rafters were thus initially tied together by a horizontal tie.

A slab is usually several inches thick and supported by beams columns walls or the ground. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. 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. For larger spans and thinner walls this can topple the walls.