Any roof over time loses its original technical characteristics and ceases to cope with the protective and decorative tasks assigned to it. In this case, many people are trying to save time and cover the roof with new roofing material over the old one.
It is possible to cover the roof with ondulin over the roofing material, however, for this it is necessary to perform a number of preparatory work. Only in this case, the roofing will last for many years, does not deform and does not cause condensation, smudges and fungi.
Mounting ondulin on ruberoid
Before carrying out installation work, it is necessary to carefully examine the roof from the roofing material and remove all damaged and swollen areas. It is most correct to make a new counter-crate on top of the old roofing material, which will solve two important problems at once.
Firstly, this way you can protect the roofing from damage. Indeed, the installation of ondulin provides for its fastening by drilling. If you damage the tightness of the old roof, you can violate the waterproofing.
When installing the counter-battens, you can not only securely fix the ondulin, but also create an air gap between the old and new coatings. Thanks to the obtained air gap, the necessary level of ventilation will be provided.
Installation Tricks
It is important to remember that ruberoid and ondulin are bituminous materials that are sensitive to open fire. Because of this, such a “neighborhood” can become dangerous for the owner of the house.
In this case, it is advisable to treat both coatings with special means - flame retardants, which increase the resistance of materials to fire and prevent fire.
Also, before installation, it should be clearly defined what period of time the roof of the roofing material serves. All because this material has a shorter life, comparable to ondulin. If the roofing material coating has been installed for a long time, it may become unusable before the ondulin roofing, which will cause technical problems for the house owner.
It can be concluded that it is possible to cover the roof with ondulin over the roofing material, however, for this you need to have experience and have specific skills. In many cases, it will be more advisable to dismantle the old roofing and install a new roof. This will protect yourself from unpleasant consequences in the form of dampness, condensation, the appearance of fungi and mold, damage to tightness.
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