Before insulation of the attic room, it is necessary to check the condition of the roof and those places in which the heat insulator will be placed. Wood is treated with solutions of antiseptics. Check the integrity of the waterproofing layer. If necessary, equip the hydrobarier. In the areas of damage to waterproofing make marks using repair tape.
All space between the rafters is filled with heat insulator and placed on top of the insulation. The joints are placed at right angles to the legs of the rafter so that they overlap. For insulation of overlaps, bulk material is used. When laying insulation, you need to make sure that there is no dents. Plates placed back to the outer walls.
One of the problem areas in the attic is the place of joining windows and roofs. To insulate the window slopes, the material is placed at an angle of 90 degrees to the window and go to the slope plane. It is also necessary to carry out the heat insulation of the roof in the places of intersection with smokers and ventilation channels. For these sites take mineral wool that does not ignite. The insulation is laid without voids and gaps.
To prevent the insulation humidification, lay a layer of vapor barrier. Ribbons are placed with punching in 100 mm. Film is fixed using tape. Then vaporizolation is closed with facing material.