Is it worth it (or even possible) to put a second floor on a house by lifting the current roof of the attic and bulding walls under it? Assume the 1st floor structure etc is strong enough.
Or …. Is it worth re-using the lumber from the present roof if you could carefully remove it piece by piece without destroying it?
Quantum materiae materietur marmota monax si marmota monax materiam possit materiari?