With all these units a reasonable expectation of life cycle is within 20 – 25 years. Some companies are working on adhering tiles and slates with individual smaller sections that wire into the attic of homes. This is a viable way of making the units replaceable at a later date. It does shoot holes (literally) into the underlayment craze we find ourselves in these days.
The best method for installation is the standing seam clamp installation. This system allows for runoff under the panels and the clamp is positioned up on the seam of the panels. The worst application is of course, the screw-to-the asphalt shingle roof system where dams occur and related problems associated with surface mounting onto a roof where water velocity is a real problem. Raised mounting brackets show some promise in this regard.
It is essential that a quality roofer install these systems onto rooftops with the expressed intention that these systems are not permanent. The design should include expectation for removal of these systems for roof work under them and for the retrofitting of replacement units.
For a reasonable forward looking contractor, the slate and tile systems and the metal raised mounting seems to have the most potential. The tiles and slates can actually be aesthetically attractive systems as they are within the shingle or tile plane. No real obtrusive element to the systems exists, except for the color differences in the malleable panels that are adhered to the slates and tiles. The ease of making changes is attractive to the roofing contractor.
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Note: Image is from the "abcsolar.com" website
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