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The house, built prior to World War II, had no vapor barrier under the concrete.

The current price to install traditional fiberglass batts and a plastic vapor barrier is $3,917.

Nicholson & Galloway, an exterior restoration contractor experienced with historical domes, repaired cracks in tiles, patched concrete, then layered on new protective materials: a hand-troweled vapor barrier, spray foam insulation, stainless-steel framing, plywood sheathing.

Washington’s code also requires a 6-mil vapor barrier for ground covering.

The protections will kick in at 52 degrees for those who wear vapor barrier clothing or chemical resistant suits, for example.