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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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