What does Concr stand for?

Concrete

Beads or drops of water (and frequently frost in extremely cold weather) that accumulate on the inside of the exterior covering of a building. Use of louvers or attic ventilators will reduce moisture condensation in attics. A vapor barrier under the gypsum lath or dry wall on exposed walls will reduce condensation. A hollow concrete ‘brick’ often 8? x 8? x 16? in size.