The insulation is tightly laid between the rafters, without using additional fasteners. This requires attention and accuracy, without compressing and irregularities. The laying of the second layer occurs according to the principle of displacement, in order to avoid penetration through the seam of cold air. The moment must be taken into account.
After that, the vapor barrier film is laid and its temporary fastening by the center. This work is easier to do together. After that, the film is gradually attached to each rafter. Fastening occurs at a distance of 30-40 cm. Next, the second layer of film with a drop of at least 10 cm is attached. In this case, the joints glue. It is possible to use a special sticky tape.
The next step is the walls of the walls. To do this, use special strips, which then screw to the rafters.
Next, the lining of GVL slabs is attached. Depending on the step, the slabs are cut. The joints between the slabs should be tightly pressed. In this case, if necessary, convexity can be trimmed with a shirt.