Admin Where do you put vapor barrier under concrete slab?
- Most exterior slabs do not need a vapor barrier.
- In general, place the concrete slab directly on top of the vapor barrier, with the subbase below.
- The vapor barrier can be placed under the subbase, if the building is closed in when the dry subbase material is placed.
Should you put a vapor barrier under concrete slabs?
A concrete vapor barrier is any material that prevents moisture from entering a concrete slab. If you have a concrete floor that’s in continuous contact with a source of moisture, you’re going to have problems. This is why a vapor barrier under concrete is essential.
Where should a vapor barrier be installed?
Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions: the inner surface in colder climates and the outer surface in hot, humid climates.
Where do you need a vapor barrier?
A vapour barrier is an important component in building construction. Its purpose is to help prevent water vapour from reaching building walls, ceilings, attics, crawlspaces or roofs, where it can condense and cause building materials to rot or grow mould.
Where do you put a vapor barrier?
Does a concrete patio need a vapor barrier?
Water vapor will always move from a high relative humidity environment below the building into an area of low relative humidity – even through concrete. That’s why nearly every expert in the concrete industry recommends a below-slab vapor barrier to stop the vapor drive of water upward and into your building envelope.
What side of the insulation does the vapor barrier go on?
warm side
In order to prevent condensation from forming, a vapor barrier should be placed on the warm side of your insulation to stop warm, moist air from condensing on a cold surface inside your wall. In cold climates like Canada, for most of the year the vapor barrier should be on the inside of the insulation.
Can you put a vapor barrier over concrete?
You’ll typically need a vapor barrier if you’re installing flooring over concrete. Therefore, because concrete is porous, it’s a good idea to install a vapor barrier over your concrete subfloor before installing your flooring.