Many local building codes now require old shingles to be removed before new shingles are installed. New shingles seem to last 50 percent longer if the old shingles are removed, and old shingles are a lot of unnecessary weight on a roof. The building codes are mostly to protect future buyers from half-buted repairs that don't hold up or cause problems later.
I can understand that shingles under a metal roof would be much harder to extinguish if a building ever catches fire, but I doubt that alone would increase the possibility of a fire starting.
It's your shed. If no building codes apply, then metal over shingles might be the least cost for you now. If you go that way, I would also try to save some more money by not insuring the building for fire, or collapsing in high winds. Odds are if the building does catch fire, your fire department won't be able to save it before the roof falls in, and your insurance company will find a way not pay for the loss because of the substandard roof. Is the shed close to any other buildings of value?
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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