![]() Tape all seams with a suitable adhesive tape so that you finally have a closed surface for the insulation. The foil is stretched between the rafters and the roof tiles - the foil should sag a little to allow condensation to drain off. Use a cutter knife to cut the underlay foil with an overlap of 10 cm on all sides. In addition, the humidity of the living space or attic can be transported to the outside via the foil. An underlay foil protects the insulation material from penetrating moisture from the outside. Tape the seams with suitable adhesive tapeīetween the rafters and the roof tiles you need an underlay foil (diffusion-open), which is usually already present in modern buildings.Stretch the foil between the rafters and the tiles.Cut the underlay foil to size with a cutter.Installing the underlay foil for the roof insulation If there is not enough space to achieve the total insulation thickness, use appropriately thick squared timbers and screw them onto the existing rafters so that they are at least 16 cm deep. For your individually suitable insulation thickness, orientate yourself on the thermal conductivity group of your insulation material (thermal conductivity group 035 to 040) - here, a thickness of 20 cm -24 cm is best. However, in order to achieve the best possible insulation later, the total insulation thickness of the rafters should measure at least 16 cm. In older houses and old buildings, the rafters are sometimes only 10 cm thick. If necessary, double the rafters with squared timbers (at least 16 cm).How to insulate a roof - step by step Measure and double up the rafters INFO: The lower the U-value, the better the insulation. The chosen insulation material (in this case clamping felt) should belong to the thermal conductivity group 035 to 040.If your rafters are not deep enough to fit this amount of insulation, you can help with squared timbers. To achieve an optimal heat transfer coefficient (U-value), the insulation density should be 16 cm at best.If your roof is not open to diffusion, a ventilation layer helps to remove the moisture.Moisture can accumulate between this and the roof insulation and lead to damage such as mould. Especially in older buildings, you will often find roofing felt under the tiles. The roof must be open to diffusion, i.e.Alternatives to insulation with glass wool or rock wool can be rigid foam boards or renewable insulation materials such as hemp or cotton.īefore you start, check the following points: In this article, you will learn how to insulate your attic yourself with felt. ![]() ![]() However, it is better to leave above-rafter insulation to a professional. Under-rafter insulation as well as between-rafter insulation can also be done yourself with skill and DIY knowledge. Which type of insulation is best depends mostly on the construction of the roof truss. Under-rafter insulation, between-rafter insulation or above-rafter insulation? The lower this U-value, the better the thermal insulation. EnEV 14 specifies a heat transfer coefficient (U-value) of a maximum of 0.24 W/(m2K), which describes the heat loss of a building component. The Energy Saving Ordinance 2014 (EnEV 14) also stipulates by law that even unused attics of the top floor ceiling must be insulated. Insulation between the rafters, under the rafters or on top of the rafters makes sense in any case to save heating costs and to heat in an energy-efficient way. Up to 30 % of heat is lost without insulation. Doing roof insulation yourself | Between-rafter insulation | Step-by-step instructions
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