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Installation Of A Concrete Moisture Barrier

By Nita McKinney


It can be argued that almost all homeowners prefer to have houses with modern concrete floors are free from cold as well as dampness. Mainly, this is drawn from the point that traditional concrete floors allowed moisture to rise to the slab during placement. Moreover, soil moisture also causes other effects to the slab and which are destructive to the floor as well as costly to renovate. Such damages include; slab curl, efflorescence, discoloring of acid stains, aggregate destruction, condensing objects above the slab, and destruction of sealers and overlays. However, the application of the concrete moisture barrier has been found to solve these problems.

A moisture barrier serves a very important role in the construction of a floor. Not only does it serve to control the water vapor rising to the slab, but it can also completely eliminate that moisture. Nevertheless, homeowners are advised to use only the modern vapor barriers instead of the old ones.

The old retarders efficiently control the soil vapor, but they still allow more vapor to reach the slab. In addition, they cannot withstand much pressure from placement of the floor concrete. However, these problems are solved with the use of new barriers which completely bar vapor and conform to the ASTM E-1745.

The ASTM E-1745 specification is categorized into three classes that have the lowest rate of permeability. This means that they completely eradicate the contact of water vapor with the floor slab. Hence, a floor constructed using a sealer dries up quicker than those having old vapor retarders.

It has also been discovered that modern barriers are resistant to damages that may arise when placing the slab. With the aid of the global construction guide, it has been noted that a ten-millimeter barrier can effectively stop the contact between the soil vapor and the slab. However, it is also claimed that such thickness withstands pressure but still permits vapor to reach the slab.

Constructors have improvised modern types of sealers that do not allow vapor passage. They include; polyguard, raven, reef, interwrap, fortifiber, stego, and strata systems, among others. In conjunction with the ASTM E-1745 guide, these barriers ensure an effective approach to the handling of floor dampness. For instance, the guide states that the floor slab needs to be put on top of the barrier with the sub-base left below it.

It also dictates that holes should not be bored on the sealer even if the slab is highly soaked. In the same manner, form stakes should not be pounded on it because that will destroys it. Instead, it should be supported using bearing pads as well as sealing it with the vapor stake.

It is also recommended that the barrier should be sealed using the vapor beams with a six-inch overlap, as well as block outs and pipe penetrations. Moreover, it should be sealed to the foundation wall and protected using the manufacturer tape that bars any possible damage. Similarly, it is recommended that the slab should only be placed on the concrete moisture barrier if the sub-base is protected and kept dry. This also includes using adequate aggregates and providing reinforcement on the lower part of the slab. As a result one will have a floor free from dampness and cold.




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