Roof Structural Members

Rafters have a tendency to flatten under gravity thrusting outwards on the walls.

Roof structural members.

Pairs of opposing rafters were thus initially tied together by a horizontal tie. 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. Straps and different types of bracing. A slab is usually several inches thick and supported by beams columns walls or the ground.

A slab is a structural component that is used to create flat horizontal surfaces such as floors roof decks and ceilings. Purlins horizontal members connecting rafters. The roof system consists of several very important parts. Rafters are sloped beams that run from the roof s ridge to the eaves.

A waterproofing seal installed along the roof s valley line with taktekkernbergen no. 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. Wall beams or plates sometimes described as a type of purlins that run horizontally under the roof truss and connect it to walls. For larger spans and thinner walls this can topple the walls.

Tie beams connecting each pair of the opposite rafters. Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins. They provide the support for the external roofing material. 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.

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 space between each truss is known as a bay. The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart. A waterproofing layer that protects the roof valleys from leaking.