Use this CSI 3-part SimpleSpecs™ template to specify sheet gas retarders for controlling radon and methane gas migration. Including building structures through crawl spaces, slabs on grade, and basement walls and floors.
A gas retarder is a material placed under concrete slabs to inhibit the passage of gases, such as radon, through the slab. These materials are typically made of polyethylene or other types of plastic and are placed on top of the soil before the concrete is poured. They help to prevent the buildup of harmful gases in the living space above the slab.
Gas retarders are important because radon gas is a radioactive gas found in soil and rock formations. When it enters a building through the foundation, it can accumulate to levels that are dangerous to human health.
Long-term exposure to high levels of radon gas has been linked to lung cancer. By preventing the passage of radon gas through the slab, gas retarders can help to protect the health of the building’s occupants.
A gas retarder’s lifespan depends on the material’s quality, the conditions it is exposed to, and the level of maintenance it receives.
Generally, a well-maintained gas retarder made of high-quality materials can last for several decades. However, inspecting the gas retarder during installation for signs of damage and contamination and repairing or replacing it immediately is important.
To be effective, the gas retarder must be continuous, with joints sealed and the retarder sealed around all penetrations and at the perimeter.
Using the term gas barrier is discouraged since it is nearly impossible to construct an absolute barrier.
Related SimpleSpecs™ masters:
The SimpleSpecs™ master specs concept
Design professionals are accustomed to seeing lengthy project specifications, so why is SimpleSpecs™ so short?
Specifications have grown evermore wordy over the years for several reasons:
The mistaken belief that specifications must be lengthy and legal-sounding to be enforceable. In fact, quite the opposite is true. Having shorter, easily understood specifications makes us less likely to have problems in the field.
A belief that having lots of words protects us from a Contactor making mistakes. There is no way to include enough statements to protect yourself from a bad contractor, regardless of the length of your specification.
Our desire to be in control of the project by specifying means and methods instead of including simple, enforceable statements.
Easier to Edit
SimpleSpecs™ is written as a series of Microsoft word files that include statements that affect construction costs or overall quality and are far simpler to edit than other master specification systems.
Each SimpleSpecs™ specification section is non-proprietary and includes three manufacturers that meet the specified reference standards, descriptive, or performance-based requirements. They are written to allow any listed manufacturers to provide the specified products.
Hidden Guide Text
Each SimpleSpecs™ specification section includes hidden text to inform and guide users in editing the specifications to suit project conditions.
SimpleSpecs™ sections are edited using pre-defined options that are contained in [brackets] or by selecting optional text separated by "OR" statements. Paragraph and page numbering are included as automatic codes, eliminating the need to renumber when revisions are made manually. Global changes to headers, footer, terms, font colors and phrases are easily updated using a third-party search and replace software, available through ZeroDocs.com.