Sagging roof lines can originate with the horizontal ceiling rafters.
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When the framing of the roof is put together quite frequently two of the ceiling rafters will be fixed together as this will create a much longer span.
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If your roof is sagging under the weight of too many shingles ideally all the shingles should be removed and a new set installed.
This gives your roofer a chance to inspect the flashing and roof underlayment for damage.
When the roof framing is assembled two ceiling rafters are often joined together to create a longer span.