Mormon History, Aug 1, 1845

[Nauvoo Temple] The Times and Seasons reported that the roof, composed to white pine singles, was nearly completed. A second roof was also planned, which would be made of zinc, lead, copper or porcelain; a sheet of lead had already been placed over a small section of the wooden shingles.

[source: Brown, Lisle (compiler), Chronology of the Construction, Destruction and Reconstruction of the Nauvoo Temple]