The concrete moisture issue is one that causes continual ... low-permeance vapor barrier placed directly beneath the slab. If the barrier below the slab is absent, the results of any type of ...

Moisture vapor migrating through the slabs can also cause “efflorescence” or powdery crystalline deposit of salts on unsealed concrete ... and air and vapor barriers. Primary chemistries ...

Older slabs were often constructed without moisture barriers, or the moisture barrier has degraded over time. Or maybe a plumbing leak has developed. High moisture levels in the concrete could ...

Over time the residual moisture can even infiltrate basement walls and cause structural damage to floor joists or concrete slabs. Installing a vapor barrier is one of the most effective ways to ...