Number Data Set

Small volumes of water occasionally flowed into unventilated spaces under the bathtubs. The main path was the retractable handheld shower head on a chromed spiral-wound hose that penetrated the horizontal marble benches near the foot of the tub. When guest suites were unoccupied, warmed by sunlight, and not cooled by air-conditioning, heat conducted through the tubs and marble caused water in unventilated voids below to evaporate.

room and material temperatures below the dewpoint of the trapped humid rcs data air, water condensed on the galvanized steel framing. Moisture was also absorbed by the tile adhesive. Periods of wetting were long enough for steel to rust before its zinc coating provided a protective layer of stable hydroxy-carbonate. The worst-affected zinc surfaces likely were permanently in contact with stagnant condensate.

The condition of the galvanized steel was found to be highly variable. Some zinc surfaces still displayed bright spangling, whereas others had been completely depleted and replaced by rust-colored nodules and stalactites. Remedial work included replacement of galvanized steel with stainless steel and measures to improve drainage, ventilation, and access to bathtub enclosures.