A contractor told us it would be cheaper if we left the existing flat roof in place and then added the new pitched roof. Is this an advisable thing to do or is it a shortcut that we should steer clear of?

  • Are you intending to use the attic space at all? If so, do you care if there is roofing material on the floor? – Comintern Sep 23 '16 at 1:43
  • Voting to close as too broad. Way too many variables here, and OP hasn't been back. – isherwood Oct 24 '16 at 15:15

Depending on how your existing roof is structured it should be a very straight forward task.

Just as a mention, even flat roofs have a slight pitch.

Even pitched (gable) roofs start with the same structure at the ceiling level. Either one supporting wall is built slightly higher than the other, or by adding a little framing to create the slight pitch needed to get the rain off one side or the other.

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