In the context of roof construction, a strut is a crucial structural component that provides essential support within the framework, typically as part of a roof truss.
Understanding the Role of a Strut
A strut plays a vital role in ensuring the stability and load-bearing capacity of a roof. Based on structural principles, struts are designed to resist compression.
Specifically, a strut is an integral part of the load bearing aspect of a roof's truss, providing outwards-facing support. This function is key to preventing structural failure under the weight of the roof itself, as well as external loads like snow or wind.
How Struts Work in a Roof Truss
Struts are strategically placed within the triangular framework of a roof truss to transfer loads and counteract forces that could cause the structure to deform or collapse.
- Load Bearing: They are part of the main load-carrying system of the truss.
- Providing Support: They prevent other members, particularly rafters, from buckling or spreading outwards.
- Outwards-Facing Support: This phrase emphasizes their role in pushing against other elements to maintain the truss's shape and stability.
A common example of how struts are used is in conjunction with a king post truss. We mentioned before that you will typically see struts extending from the king post to prevent the two principal rafters from falling in on themselves. In this setup, the king post hangs vertically, and the struts connect it to the sloping principal rafters, bracing them against inward movement.
By providing this critical support, struts ensure the roof maintains its structural integrity and effectively transfers loads down to the supporting walls.