Effective roof insulation allows considerable savings in heating costs, which is commonly known. Which measures are covered by the term roof insulation? In principle, it has to be noted that the terms “insulation” and “insulation” are two different work steps which are, however, closely related. While the insulation has the task of reducing heat energy losses as efficiently as possible, but allows a certain air exchange between interior and exterior areas, the insulation aims at a complete isolation of the interior from external influences , whereby the transition of air and moisture between interior and exterior as well as Is prevented.
Interior insulation – the usual form of the roof insulation
The roofing contractor, in consultation with the client, decides in which way the insulation is to be installed and with which insulating materials the best result can be achieved. The most widely used method is the interior insulation. A distinction is made here between the intermediate and the lower-span insulation. Both variants lead to the conclusion that in the summer, a heat storm under the roof is avoided, and underneath the remaining spaces remain pleasantly cool.
In winter, the insulation ensures that the heat is not released unhindered through the roof chair into the open air. The internal insulation of the roof is usually carried out during subsequent insulation measures. If the roof is not yet removed, this insulation variant can be carried out quickly and relatively inexpensively. The roofing is virtually unaffected.
External insulation on the roof is very efficient
The outer insulation is considered to be the most efficient insulation method for the roof, since the insulating insulation above the rafters creates a closed insulation surface without heat bridges. However, in the case of a subsequent installation, the exterior insulation will cause some difficulties for the client, since the covering of all bricks is necessary for the assembly. This method is therefore recommended especially for new buildings. If, however, new roofing is planned within the framework of a roofing renovation, the rafter insulation can also be useful in old buildings. In the case of flat roofs, the design of the exterior insulation requires particular care in the execution of the waterproofing and should not be carried out by laymen without the advice of a specialist.
Mineral wool has a very good value for money
In addition to the decision for an insulation method, a selection must also be made for the material. Mineral wool is available in various thicknesses and is characterized by a good price / performance ratio. It can basically be used for any type of insulation. Insulation panels, which are mainly used for the insulation of walls, are sometimes also used for roof insulation, for example in the insulation of the roof. With loose insulation materials are used for the so-called blow-in insulation into cavities which are difficult to access. Polystyrene has a low weight and is easy to process; it is mainly used for the exterior insulation. The decision for a specific material should not be carried out without thorough consultation by an expert.
Protection against moisture and drafts during the insulation of the roof
The second important function of the roof insulation is protection against moisture and drafts. The protection against moisture is why such high importance, because a moistened insulation loses its effect and penetrating moisture favors the formation of mold, causing long-term damage may be caused to the building fabric. Even drafts affect the insulation effect of the roof and the investment in cost-effective insulation measures does not pay off if the roof is not airtight. The tightness of the roof is ensured by the steam barrier or steam brake.
Experts are still strongly debating whether the completely diffusion-tight steam barrier is the better solution or the diffusion-resistant steam brake. In any case, the protection of the thermal insulation in the case of moisture entering the room is decisive for its functioning. If small amounts of moisture are lost, care must be taken that this can quickly dry again.
The intermediate barrier insulation is installed on the insulation layer from the inside. On the other hand, in the case of external insulation, it is necessary to apply the steam barrier to the roof formwork and then cover it with the rafters and the insulation. In addition to the protection against moisture, a professional steam brake increases the air-tightness several times, which also reduces the energy required for heating.