One of the first steps to take when you want to install metal roofing over asphalt shingles is to be aware of the mechanical issues that need to be resolved for you to accomplish this project. One of these issues is how the old roof is ventilated and whether this would become a problem when you place the metal roofing over the asphalt roof. One of the ways to remedy this problem is to place some battens or strips of wood at regular intervals to permit air flow. The spacings between the battens will depend on the recommendations of the manufacturer and the requirements of the building code in your area.
Another important issue to consider when learning how to install this roof over the asphalt shingles is how to control the moisture under it. This could be solved by putting felt or some synthetic material under the it. It should be noted that this will also greatly reduce the noise created by rain or hailstorm. You will also need to make sure that everything is straight and square or the metal shingles could not be installed correctly. After you have made sure that everything is square, you may then draw a line that will serve as your guide when you lay down the first few metal shingles. But before you start laying them down, you will need to take a few minutes to familiarize yourself with the instructions contained in the installation guide for metal roofing that is provided by the manufacturer.
Knowing how to install metal roofing over asphalt shingles is vital especially for the interlocked roofing systems. These shingles have mechanisms for interlock on four sides and there are specific instructions to follow when installing them yourself. If it is your first time to install a roof, you may want to ask for some tips from contractors and other professionals. Do not forget to ask them about safety issues, such as the fact that metal roofing is dangerous to walk on because it is slippery, especially when it is wet. It is also important to remember that making changes to metal roofing is more difficult than for other materials. Thus, it is important to do it correctly when you install it.