Floor Insulation Water Barrier Section

Reflectix and similar reflective radiant barrier products provide almost no insulation under or on top of a concrete slag just r 1 for reflectix.

Floor insulation water barrier section.

Continuous air barrier 2 confirm that construction documents specify a continuous air barrier for the building components associated with the insulation of the exterior floor s. When warm moist air from the living space reaches the colder metal of the van walls it condenses into water and gets trapped potentially causing rust and other problems over time. In most parts of the country the vapor barrier should face upward. If you don t want to use number 15 asphalt felt you can use some other approved water resistive barrier wrb.

5 the orientation of the vapor barrier depends on the home s location and climate. 1 the u factors r values shown for ceiling wall and raised floor insulation are for wood frame construction with insulation between the framing members. This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses. The code requirement section r703 2 includes a qualification.

Breaks or joints in the air barrier should be sealed. Vapor barrier goes on the warm in winter side. Around objects that store or distribute hot water and indoor air. 2015 irc iecc air barrier and insulation installation table r402 4 1 1 n1102 4 1 1.

For alternative construction assemblies see section 150 1 c 1a b and c. Insulates ducts that pass through cold attics. So this is clearly an ineffective solution. The best option under a concrete slab is foamular 250 which delivers r 5 per inch of thickness along with 25 psi of compressive strength.

Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. Use insulation hangers wire staves spaced every 12 to 18 inches to hold the floor insulation in place without compressing it more than 1 inch. Foam boards insulate while providing a partial vapor barrier. Pipe insulation duct insulation and water heater jackets.

You could put batts too. Usually composed of a thin film such as polyethylene vapor barriers are used to retard or prevent water vapor diffusion into a wall ceiling or floor during the cold winter. In any case the vapor barrier must point to the warm side. 2 u factors can be met by cavity insulation alone or with continuous insulation alone or with both cavity and continuous insulation that results in a u factor.

The code requirement calling for walls to be covered with number 15 asphalt felt is very odd because every manufacturer of asphalt felt declares unequivocally. Seal rigid foam panels between foundation joists using spray foam. So any plastic under the insulation will encourage moisture.