The very creation of the roof supporting structure is one of several stages that is associated with the completion of the construction of the house. However, in addition to finishing the outside, it is also necessary to refine what is inside. The whole structure of the house, which is referred to as the roof truss, is hidden under the tiles. This is what the entire roof structure is based on, which is its support, and their main element are roof trusses. They are the main focus of ensuring the stability of the house and keeping the roof intact. This technique is known in Europe, and nowadays more and more attention is being paid to it also in Poland.
What are truss-based roof structures?
Roof trusses as a wooden roof finish are successfully used in other European Union countries. This is one of the most popular solutions that combine the reliability and quality of the materials used (wood) with their generally available nature, while maintaining low production costs, which is certainly an undeniable advantage of using them in residential construction. The roof itself is then much easier than it would be if traditional methods were used. For their construction, solid wood of the highest quality is used, which must have appropriate technical parameters. The trusses are connected by means of multi-spike plates. During their installation, the shape of the roof is sloping – a roof structure is formed. The whole thing is therefore light, ecological, it does not increase the pressure on the house, and at the same time very cheap. Roof trusses can be covered with all available tiles on the market, ranging from ceramic, slate and roofing shingles to trapezoidal sheet or metal roofing tiles.
What quality should the wood be?
The whole roof structure must be durable and the key issue is the type of wood used. Roof trusses must be highly resistant to changing weather and physical conditions. Therefore, it is worth using coniferous wood. This will ensure significant strength of the structure, which is characteristic for these types of trees, while maintaining a low purchase cost. Pine or spruce roof trusses are the least susceptible to damage, but spruce is more difficult to impregnate. Other species, such as larch, remain resistant to fungi, but its price significantly exceeds the cost of purchasing spruce or larch roof trusses. From trees with a high hardness index, larch and fir are recommended,
Does wood moisture matter?
It is known that the lower the moisture content of the wood, the better quality it is and more suitable for use in the production of a roof truss. Generally accepted standards for wood should not exceed twelve percent, and it is usually only a conventional indicator of moisture content for wood. In fact, often traditional drying methods leave the wood with a moisture content of up to around fourteen percent.
The moisture content of the wood for the roof is crucial as the wood changes its shape as it dries. During this time, deformations occur which ultimately affect its form, and at the same time maintain high quality. The higher the humidity, the quality of the wood is weaker and less resistant to physical conditions. It is also worth remembering when buying wood not to purchase pieces that are to dry out in the future. Fresh wood trunks, even after waiting a year, may not dry completely, and their original moisture content may drop to about 20% during this time. The use of such wood in the construction of the roof is a mistake.
What impregnation to choose for roof wood?
Proper wood impregnation is also required in the case of structures such as the use of roof trusses. As a result, the wood retains its colors for longer and remains protected against pests. Wood impregnation will also be useful in the event of ensuring safety against an unwanted fire . In such a situation, the sawn wood should be rinsed slightly with a biodegradable liquid and additionally with a fire protection liquid. It is crucial that they are used for roof trusses immerse the wood in containers with impregnation instead of the standard application of liquid to the surface. The so-called by immersion method. The entire process should take at least a few hours. An alternative is to use the pressure method, when the wood is rinsed with the impregnant under high pressure at a significantly elevated temperature. It should also be remembered that the impregnation should be applied only to the roof trusses that are ready after cutting.
Production and certificate
High-quality wood used in the construction of roofs should have an appropriate certificate. It is a legal basis that guarantees the buyer will receive a high-quality product. It is also information about the production itself, what kind of treatment the wood has undergone and what are its current properties. It is also the basis for the buyer to be able to return it on the basis of a complaint in the event of receiving defective wood.