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The door frames of wooden windows today are normally present on the market in two materials: wood or galvanized steel.
Those in galvanized steel are adopted by many companies, especially for the benefit of being delivered disassembled and for resulting economic cost of transport.
Instead represent a disadvantage for clients especially for the high thermal conductivity of the material.
Door frames generally have a side in the light that determines the plane of the wall plaster. When they are for roller blind the end of the flap is the guide to the cloth roll.
In all cases, therefore, the end of the flap is in contact with the outside temperature and in case of roller blind with considerable surface.
In the winter months the very low external temperature is transmitted through the plate until the frame that is in contact with the plaster, which, therefore, in the immediate vicinity, it cools.
In the case of saturated relative humidity in the indoor environment, particularly frequent in the kitchens and bathrooms, the points of cold plaster may cause condensation and mold.
It is not uncommon in fact to note in the home black lines on the perimeter of the window frames. With wood door frames, given the low thermal conductivity of this material, the risk does not exist.
In order to maintain the same benefits of straightness of controtelai sheet, we have adopted a mixed system with turn-ups in wood and aluminum, as well as provide the thermal break, allows you to avoid coprifilatura external (usually necessary in the presence of side wood) that, due to its small section, takes less time than the window.
The only exception is represented by door frames for monoblock frame with roller blind that, to combine all the accessories for the operation of roller blind, can only be constructed entirely of sheet metal. | 
