![]() ![]() Keep in mind the greater the temperature differentiation between the building envelope and the outside, the quicker water vapor in the warm inside will condense onto cooler surfaces. It is tempting to forego wall insulation when erecting a post-frame building in a warmer climate zone. The most commonly used vapor barrier under concrete slabs is polyethylene (poly) plastic sheeting with a thickness of 10 mil or 15 mil. This standard ensures the poly sheeting’s resistance to vapor migration and meets industry standards for tensile strength and puncture resistance. Installing the proper vapor barrier beneath the slab will save you money, health, and aggravation.Īmericover offers a variety of concrete slab vapor barriers and tapes, which meet ASTM E1745 specifications. Moreover, where there is moisture, there is a potential for mold growth. Often where water pools, the concrete often spalls and cracks. In larger commercial buildings and warehouses, that moisture can cause the flooring sealer and joints to fail. That air condenses on the cooler concrete floor. Post-frame buildings with metal roofs, and especially buildings with minimal insulation, hold warm, moist air. A vapor barrier under your slab will also protect you from harmful ground pollutants like radon gas. Vapor Barriers Under the SlabĪ vapor barrier under your concrete slab is essential for moisture prevention. From slab to walls to roof, here are ways to protect your post-frame building from moisture by installing proper vapor barriers. Post-frame buildings or pole barns are popular for commercial, industrial, and agricultural purposes. Built on concrete slabs and often capped with metal roofing, post-frame construction can pose unique vapor barrier challenges. ![]()
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