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I have an old (perhaps >100+) stone flag/thick tile roof which is most likely to be kerridge sandstone as that is local - last refurbed ~80s+90s. Rather Heavy. Not too concerned about incremental PV system weight but it will need care and thought in terms of what and where it is anchored to in a barn conversion roof construction. A windy exposed site. I have reservations about a ballasted over ridge frame drop on and tie it down approach - solar sailing ! but I am open minded at this point about what would be the safest and least invasive approach in context. I am interested in others' experiences with installation approaches and suppliers for PV on barn conversions / this kind of roof. This is retrofit as a full renovation in not in progress and it was converted slightly too early for this to have been done at the time of conversion. I am cautious about disturbing an old roof outside of a broader renovation and perhaps uncovering latent requirements - it doesn't leak at present - it would be a shame to trigger this and accelerate wholesale roof works. The site has PV potential as there are a couple of large SE and SW aspects which could easily hold the maximum allowed FiT system or much larger 3x-5x in terms of roof space. It is very tall for a 2 storey building and the roof (and cars and everything else) are prone to moss growth. I am also slightly concerned about maintenance access for cleaning without scaffolding having not researched these aspects to retain output yet. Direct experience or thoughts on things I should be thinking about in up front in planning other than carefully considering suppliers (builders, roofers, sparky) with the right credentials for this type of building.