Local Forecast Office More Local Wx 3 Day History Mobile Weather Hourly Weather Forecast Detailed forecast for Eastern Mojave Desert, Including the Mojave National Preserve
A transportation barrier is a natural barrier like mountains, rivers, oceans, etc that blocks or slows the way of transportation.
Technically, any material that resists moisture passage is a vapor barrier, a term often used interchangeably with vapor retarder. But very few are true barriers as they still have a low level of permeance, or the ability to let water vapor pass through.here still may be situations where a vapor barrier is necessary over a concrete slab. Even when a slab is dry enough for the recommended use, it is still possible for moisture to migrate from the slab into porous or absorbent flooring materials like wood.