Roof Bridging Definition

Thermal bridges can be caused by.

Roof bridging definition.

Water standing on the roof surface increases the live load on the roof structure which is a safety issue. Thermal bridging generally occur when there is a break in or penetration of the building envelope e g. Bridging provides resistance to purlin rotation during the installation of roof and wall sheeting. It may provide any or all of the following functions.

The most common form is probably within the eyesight of every reader of this article. Bridging definition a brace or an arrangement of braces fixed between floor or roof joists to keep them in place. Requirement assists with the erection of roof sheeting. Suppose your walls have 6â fiberglass batts.

Bridging blocking herringbone struts in joists stud work and roofing. For this reason a maximum bridging or bridging to cleat spacing of 20 x purlin depth but no greater than 4000 is recommended. The junctions between the wall and floor the junctions between the wall and roof. The term bridging refers to a brace or an arrangement of braces that is fixed between floor or roof joists to keep them in place prevent joist rotation and distributing loads over more than one joist.

In simple language the ridge of a roof is the peak where two opposing roof planes meet. Other similar terms include nogging and dwang. Noggins sometimes called bridging or blocking are timbers used all over the place during first fix structural carpentry to strengthen and stiffen wall floor and other timber structures. Standing water also contributes to premature deterioration of most roofing materials.

A boring definition of thermal bridging thermal bridging occurs when a more conductive or poorly insulating material allows an easy pathway for heat flow across a thermal barrier. Location of bridging must be as shown below to the nearest 50mm or as determined by the design engineer by computation. Single or internal spans 0 5l span l 0 5l 1 row bridging bridging holes cleat holes 0 58l span l 0 42l 0 35l 0 3l 0 35l 2 rows bridging. Failure to do so can lead to misaligned fastenings causing additional stresses on the fasteners and roof sheeting.

Getting a little more technical the national roofing contractors association defines the ridge as the highest point on a roof represented by a horizontal line where two roof areas intersect running the length of the area. To shed water i e prevent water from standing on the roof surface.