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3The ceilings, if of masonry, will be preferable; if, however, they are of timber, they should be plastered on the under side, which must be done as follows. Iron rods, or arcs, are prepared and suspended by iron hooks to the floor as close as possible. These rods or arcs are at such distances from each other, that tiles, without knees, may rest on and be borne by every two ranges, and thus the whole vaulting depending on the iron may be perfected. The upper parts of the joints are stopped with clay and hair. The under side towards the pavement is first plastered with pounded tiles and lime, and then finished with stucco or fine plastering. If the vaulting of hot baths is made double it will be better, because the moisture of the steam cannot then affect the timber, but will be condensed between the two arches.
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