Collection of works - roof trusses

Before the opacity of the roof to check that its structure is made according to the design (dimensions, sections, parts, and combinations thereof, the angle of inclination of the rafters, etc.). It's good to see the wood, which is to be performed rafter.
Assessment of the technical design of the roof truss is a layman's a very difficult task. Lack of technical expertise and knowledge of regulatory and technical recommendations in this area means that if there is a conflict with the contractor, the investor usually stand to lose. How to guard against such a situation?

The best, yet easiest solution is to choose a good and reliable carpentry company. These companies employ skilled craftsmen, with the titles of master and apprentice. Journeyman and master exams have seemed before committees in chambers craft (provincial capitals). He always exam consists not only of theoretical, but also practical, so it requires specific knowledge and professional skills.

In addition, every self-respecting company Joinery has specialized tools, not just a chainsaw. Of "high-end" in the truss assembly work using cranes own or rented.

But what if we chose the "inferior" group of artists? In the process of building investor is not left alone. The structure corresponds to the site manager and he is responsible for the correctness of the work. They are - including the roof trusses - technical approval by the site manager. The proper execution of the work or any amendments are reflected in the form of an entry in the log building.

If investor confidence is undermined by the manager and the contractor, there is nothing else, as have our own work to ensure supervision inspector or do it yourself. The task is not easy, but possible.

Suitable wood

The material from which it is made rafter is one of the first steps in the assessment of the roof structure. Its quality affects the stability and the quality of them. Most often used for roof is pine or spruce.

Humidity. For economic reasons, investors decide to buy a "wet" wood obrzynanego. This is not a good solution, but it does not disqualify the structure. The term "hibernation" of the roof structure, wood get wet humidity of about 15-20%, or such as wood-dried. Then you can put a layer of thermal insulation roof.

Definitely better material is wood dry and optimal - dried and planed industry on four sides. These processes make the wooden parts are smooth and have a low humidity. This increases their resistance to fire and makes it even temporary moisture due to rain or snow, is only superficial and does not affect in a significant way to this material. Besides, the wood drying process sterilizes it with all kinds of spores and larvae. This reduces the possibility of corrosion in the area made roof structure.

Quality. Delivered to build in the form of squared timber beams and construction should be free of large  (rounding). In any case, one can not avoid leaving remnants of bark on the beams. They are a potential source of biological corrosion.

The noticed deep cracks on both sides covering 30-40% of the width or height of the section should not be used in the construction.

One of the basic and most common defects are wood knots. They have a negative impact on its strength. Avoid knots broken (for example, those who have dropped out of the element and reduced its strength). In places all kinds of cuts, grooves and other treatments woodwork should not even be big knots healthy (more than 4-5 cm in diameter).

Please note, if bought wood for the roof truss structure to our house there is no mildew on its surface.

Impregnation. Wood that is not dried dry and ostrugane, should be protected from fire, insects, fungi and impregnating a suitable preparation. Saturated with the elements of the truss by painting, spraying, bathing or using vacuum pressure.

Among these techniques is the most effective method of impregnation pressure. The others are also good, but require strict adherence to the manufacturer's product (moisture content, the proportions of the preparation, the number of layers, bath time).

Quality assessment done impregnation is difficult. Surely it should not be made on the basis of color or saturation. Always a need to ensure that the treated wood at each stage of erection truss is protected from rain, because they wash out protective measures. The roof structure should be so as soon as possible, or covered with a membrane roof sheathing and covered with asphalt.

Author: Learn more & Chicago Roofing Contractor service Company