Roof Bridging Definition

Water standing on the roof surface increases the live load on the roof structure which is a safety issue.

Roof bridging definition.

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. Standing water also contributes to premature deterioration of most roofing materials. 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. 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.

Suppose your walls have 6â fiberglass batts. It may provide any or all of the following functions. Bridging definition a brace or an arrangement of braces fixed between floor or roof joists to keep them in place. Thermal bridging generally occur when there is a break in or penetration of the building envelope e g.

The junctions between the wall and floor the junctions between the wall and roof. Bridging blocking herringbone struts in joists stud work and roofing. Other similar terms include nogging and dwang. Requirement assists with the erection of roof sheeting.

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. Failure to do so can lead to misaligned fastenings causing additional stresses on the fasteners and roof sheeting. Thermal bridges can be caused by. The most common form is probably within the eyesight of every reader of this article.

Present participle of bridge 2. Noggins help to straighten out wall studs and floor joists and they are also used to provide a strong fixing for something that will be later fixed to the structure. Location of bridging must be as shown below to the nearest 50mm or as determined by the design engineer by computation. Bridging provides resistance to purlin rotation during the installation of roof and wall sheeting.

In simple language the ridge of a roof is the peak where two opposing roof planes meet. For this reason a maximum bridging or bridging to cleat spacing of 20 x purlin depth but no greater than 4000 is recommended.