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Section 183A Section 18, states if less than 75% of the owners do not approve an improvement to a common area then only those who approve of it have to pay for it. However, the same is not true for a repair.
There difference here is the shingles being in disrepair need to be maintained and replaced, which is maintenance and not improvement, since "replacement" of something, even though it is upgrading the shingles, is maintenance. See: Fazio v. Trs. of River House Condo. Trust (Mass. App., 2012) (where they held replacement of trees with different types of trees was still maintenance). Here, like the trees you are replacing shingles that need to be fixed, with a better type of shingle, but they still need to be replaced. And thus still maintenance.
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