For roof truss construction, inexpensive and durable wood from coniferous trees is typically used. However, not everyone knows that before use, it must be properly prepared to ensure the roof structure is stable and durable, serving its users for many long years. Therefore, we answer the question: what wood should be used for roof trusses?
Usually, the type of wood used for the roof structure is decided by the designer, who specifies it in the project. In practice, however, it often happens that the investor, after consulting with the contractor, chooses and purchases the wood for the roof truss. This makes it even more important to know which type will be suitable.
Is pine suitable for roof trusses?
This is one of the most frequently asked questions, not just on online forums. Every investor seeks a material that will be durable, strong, and resistant to changing weather conditions, including pests. It’s worth noting, however, that pine is one of the most commonly used woods for roof trusses, but not the only one.
What wood for roof trusses?
In Poland, most wooden structures are still traditionally built from individual elements that are then joined on-site. Here, pine wood is most often used for roof trusses, which can be purchased at a sawmill. It is sawn and trimmed on all four sides. Modern roof structures differ from those built decades ago in the way elements are joined. Currently, the use of “classic” carpentry joints has been almost entirely abandoned. Instead, individual roof elements are increasingly joined using nails, screws, and metal connectors.
Types of wood for roof trusses?
To answer the question above, it’s worth noting that roof trusses are most often made from coniferous trees, not only pine but also spruce. Sometimes, trusses made of fir or larch can also be found. Each has slightly different properties. Spruce has significantly fewer knots, which means the structure has no weak points. It is stable and durable, as each knot weakens a beam. A downside can be that spruce wood is more difficult to impregnate, and this material is less resistant to the effects of time.
Of course, you can opt to purchase roof trusses made of larch. This material is characterized by much greater strength and hardness than pine, which also affects its price. It also has higher resistance to fungi and other pests. The least commonly used material for roof trusses is fir, which mainly grows in the mountains. Once dried, it is lighter than pine and spruce and will not have as much resin as the other species.
What wood for the roof, dry or wet?
Any reputable specialist involved in roof production with relevant knowledge knows perfectly well that wood for roof trusses should be made from structural timber, well-dried to a moisture level of 18%.
Regardless of which wood we choose for the roof truss, it is important to pay attention to its quality and ensure it has no defects, such as through-knots, which could significantly weaken the structure. We should also remember that the method of storing and installing the wood plays a crucial role. Even the highest quality materials will not be durable if handled improperly.
