Understanding Common Terms Used in Crawl Space Waterproofing in Osage Beach MO

Crawl Space Waterproofing in Osage Beach MO

If you’re considering crawl space waterproofing, it is important to be familiar with common terms used in the industry. It doesn’t matter whether you will be purchasing materials or simply overseeing the waterproofing process, learning these terms will help you understand what your chosen crawl space contractor is talking about.

The following are some common terms used in crawl space waterproofing:

  1. Vapor barrier

You may hear this term often. It is a material that has a water vapor performance equal to or less than 0.01 perms (permeance). This is based on standard conditioning tests performed on the materials. Moisture can pass through to a specific threshold.

  1. Liquid water

Contractors use this term to refer to any state of water that is readily visible to the naked eye. It may include water puddles, droplets or damp spots. There are products specifically designed for waterproofing against liquid water.

  1. Water vapor

This refers to the gaseous state of water. There are specific products designed for waterproofing against water vapor.

  1. Vapor Proof

This is a marketing term that is used to describe the impermeability of a material to a certain volume of water. Moisture can therefore still pass through one side of the material to the other side but only to a certain extent. This is indicated by the number of zeros that occur after a decimal point.

  1. Vapor retarder

This is a material with a permeance that is between 0.01 and 0.10 perms. A vapor retarder therefore allows a greater volume of moisture to penetrate than a vapor barrier.

  1. Tensile strength

This is the maximum tension that a material can withstand without succumbing to damage i.e. fractures or tears. This measure shows just how much pressure can be applied to the material before it breaks or tears.

  1. Positive side

This is moisture control that is carried out from the outside of the home e.g. Applying a waterproofing membrane to the outside surface of the home is considered positive side moisture control.

  1. Negative side

This is moisture control from the inside of the home e.g. installing a vapor barrier to the inside wall during crawl space waterproofing is considered negative side moisture control.

  1. Vented/open crawl space

This is a crawl space that has open spaces or vents. These spaces or vents allow moisture and air into the crawl space from the exterior environment.

  1. Closed crawl space

This is a crawl space that is completely closed off from the external environment. There are no air gaps and no vents.

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