Griffolyn® Reinforced Vapor Retarders
Griffolyn® Reinforced Vapor Retarders have set the standard for moisture vapor control for over 40 years. The Griffolyn® System features a complete product line of vapor retarders, seaming tapes and pipe boots for total moisture infiltration control.
There are several levels of permeance to choose from to meet the specific project demands for roofing, wall and underslab applications.
STANDARD VAPOR RETARDERS
Type-65 is a reinforced 3 ply polyethylene, general all-purpose vapor retarder, which meets the strength and permeance requirements for most applications.
Type-85 is a reinforced 5 ply vapor retarder, which offers greater strength and lower permeance for a higher level of security in underslab applications.
Type-105 is a reinforced 7 ply vapor retarder, which is engineered to deliver the extra strength and extra low permeance needed for the additional requirements of wood flooring, special coatings and special flooring systems.
VAPORguard® is specifically engineered to combine high-density polyethylene and aluminum to provide an extremely low permeance for special applications such as radon protection, cold storage and other facilities where extreme temperature differences exist between the inside and outside of the building. Other applications would include facilities such as museums and computer rooms, which house moisture sensitive property and/or equipment.
Type-65G combines the high performance of Griffolyn® high-density reinforced polyethylene with a non-woven geotextile for an under slab vapor retarder with superior puncture resistance. When installed with the geotextile face up, Type-65G may eliminate the need for fill sand to protect the integrity of your vapor retarder. You save on both material and labor costs.
FIRE RETARDANT VAPOR RETARDERS
Griffolyn® Type-55 FR
Type-55 FR is a reinforced 3 ply general all-purpose fire retardant vapor retarder for use in walls, ceilings and roof deck assemblies.
Griffolyn® TX-1200® FR
TX-1200 FR is a reinforced 3 ply vapor retarder, which offers greater strength, and lower permeance which qualifies as a Class I building product for a higher level of security in walls, ceilings and roof deck assemblies.
Griffolyn® Type-90 FR
Type-90 FR is a reinforced 5 ply vapor retarder, which is engineered to deliver the extra strength, and extra low permeance needed for the additional requirements found in areas with extreme temperature ranges.
VAPORguard® FR adds fire retardancy to the superior tensile strength and extremely low permeance of standard VAPORguard to comply with building codes as a Class I building material for use in extremely moisture sensitive applications.
FEATURES AND BENEFITS
- Laminate construction and internal scrim reinforcement resist punctures and tears
- Low permeability greatly inhibits moisture vapor transmission
- Flexible and lightweight allow for easy handling and quick installation
- Chemically resistant for critical applications
- Fire retardant formulations available where required
- Stock rolls available for immediate shipment
The Griffolyn® reinforced vapor retarder system prevents costly damage to floor coverings, insulation, and wallcoverings, due to moisture infiltration into the building. Reef Industries supports its high quality vapor retarder systems by providing architects and engineers with technical information and assistance in product selection and specification.
The easy to install Griffolyn® System can be used under concrete slabs, in roof assemblies and in wall applications, to control moisture infiltration in the building envelope. It is primarily used for critical vapor retarder applications in schools, office buildings, medical facilities, museums, hotels, etc.COMPONENTS
The main component of The Griffolyn® System consists of a number of grades of lightweight polyethylene vapor retarders, which are reinforced with a heavy-duty cord grid for high strength and durability to meet the requirements of a variety of applications.
The strength of the total system approach is most evident in the installation process. The most effective way to minimize moisture transmission through leaking field seams is to eliminate the seams altogether. Griffolyn vapor retarders can be manufactured in large pieces to minimize field seams. In addition to the reinforced membrane, the Griffolyn® System also includes the following components:
In cases where the job site is irregularly shaped or too large, multiple membranes can be easily and effectively sealed together with Fab Tape.Fab Tape is an asphaltic mastic that creates a durable field seam between multiple sections and to seal around penetrations in the vapor retarder. Proper installation is imperative to ensure optimal bonding and sealing.
Griffolyn® Pipe Boots
Almost every construction site has pipes and other obstructions that must penetrate the vapor retarder. Often a hole is simply cut in the membrane to allow the pipe to pass through the material. Water vapor can also pass through if the hole is left unsealed. The Griffolyn vapor retarder system provides specially designed pipe boots to effectively seal around penetrations in the vapor retarder.
Product binder, technical support, installation guides and product samples are available by contacting us at the address above or calling 800-231-6074.
NEW ASTM FOR VAPOR RETARDERS
ASTM E-1745-96 Standard Specification for Water Vapor Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs (Vol. 04.07) lists three classifications which may be used to specify vapor retarders. Specific performance requirements within each classification are Water Vapor Permeance, Tensile Strength and Puncture Resistance.
Griffolyn® has products that will meet the requirements for all three classifications. For comprehensive information on ASTM E-1745-96 contact the Griffolyn® Architectural Specifications Department.
CONSIDERATIONS FOR DESIGNERS AND SPECIFIERSMoisture Problems in Buildings
Each year, countless building owners suffer the problems associated with material and system failures due to moisture. Anyone who has faced a shutdown or limited use of their facility due to a wall system, roof assembly or flooring failure can attest to the cost and inconveniences involved. There is much to motivate design professionals to utilize every available means to avoid and minimize the potential for these problems:
- Inconvenience to the owner/client
- Monetary loss from disrupted operations
- Bad publicity
- High repair costs
- Adverse effects on indoor air quality
- Design liability exposure and litigation
- Potential impact on Errors and Omissions insurance premiums
Water Vapor Migration
One of the primary functions of the building thermal envelope is to maintain desirable temperature and humidity for occupant comfort. Within the range of temperatures encountered in buildings, water may exist as a vapor, liquid or solid.
Moisture-related problems in buildings may arise from:
- The presence of too much moisture
- Changes in moisture content
- Effects of a change of state, such as freezing within wall cavities
- Deterioration of materials due to corrosion of metals, or rotting of wood framing
In the design, specification and construction of the building envelope, the behavior of moisture must be considered, particularly the occurrence of condensation. Problems may arise when moisture comes into contact with a cold surface such as a window, or within outdoor walls or roof-ceiling assemblies. Condensation within walls that enclose air conditioned spaces must be considered in warm humid climates.
Moisture moves in air due to differences in vapor pressure, but also with movement of the air itself. The causes of air motion through construction assemblies must be considered, especially infiltration and exfiltration at windows, doors and other penetrations of the building envelope.
Vapor Retarders and Air Barriers
Most building materials are permeable to moisture. Porous materials that become saturated with moisture lose their insulating ability and may not regain it when dry. Walls are particularly susceptible, and moisture migration should be prevented or minimized by use of low permeance membranes, called vapor retarders (formerly referred to as vapor barriers). A vapor retarder is a material that has a flow rating of one perm or less. (1 perm = 1 grain/hrft2in Hg vapor pressure difference.) Permeability of one perm is often still too high for a vapor retarder to be effective in most building applications. A lower permeability rating is generally required. As a general rule, vapor retarders should be installed as close as possible to the side of the assembly through which moisture enters. Air barriers are designed to stop the movement of air, which can cause not only convective heat flow, but movement of large volumes of moisture along with the air.Permeability, Strength, Durability, Fire Retardancy
Low permeability, high strength, and durability are the primary selection and specification criteria. Additionally, building code provisions may sometimes require use of materials which are fire retardant. Vapor retarders should be selected according to their intended performance, as determined by recognized, industry standard test methods.
The investment made in selecting and specifying an effective vapor retarder system during the design and construction process are only pennies per square foot. The cost of corrective measures required by improperly installing a vapor retarder, installing the wrong vapor retarder, or not installing one at all, have proven to be many dollars per square foot.
NOTES TO SPECIFIER: Careful placement and sealing of vapor retarder materials is essential to ensure effective moisture vapor control. Perforation of the membrane for any reason will limit its effectiveness and can be responsible for failure at the time of installation. The use and placement of vapor retarders should be determined by a qualified design professional familiar with their use, and with local climatic conditions. In no case should two non-permeable materials be used in the same assembly since moisture could be trapped between them, resulting in extensive damage. By design, Griffolyn Vapor Retarders are not breathable (vapor permeable) and are not appropriate for use where breathable materials are required.
NEW ENVIRONMENTAL CONSIDERATIONS
Indoor Air Quality An important issue receiving a lot of attention lately is the subject of so-called sick building syndrome. It can have many causes including dangerous molds, bacteria, mildew, gasses given off by building materials, and inadequate ventilation. Indoor air quality (IAQ) problems dont just make a building sick; they also carry with them a high degree of human health risk. There is growing evidence that many of these problems are made worse, if not caused by, unwanted moisture in buildings. Much of this moisture enters through exterior walls and floor slabs. Mold, mildew, and other organisms feed on organic materials in the building. They often flourish in wall cavities and in the dark, moist environment under flooring materials and carpeting.
Radon Control Radon gas is a naturally occurring by-product of the decay of uranium in the soil. It can enter buildings through cracks in foundation walls and floor slabs. High levels of radon in buildings have been linked to increased risk of lung cancer. The use of vapor retarders can effectively reduce the amount of radon entering a building when used as part of a complete radon control system.
Non-solvent Flooring Adhesives Effective Jan. 1, 1996 chlorinated solvents that have been a part of flooring adhesives for many years could no longer be manufactured in the United States. Adhesive manufacturers now use either water-based or 100% solids formulations. A disadvantage of these formulations is that they may re-emulsify in the presence of water penetrating the floor slab from below, causing the floor system to fail prematurely.
Flooring materials have changed, too. Materials such as vinyl asbestos tile (VAT) which were breathable have been replaced by vinyl composition tile (VCT) which is not vapor permeable. These materials are highly susceptible to failure from condensation forming underneath the floor covering. An effective vapor retarder below concrete slabs is now more important than ever.
GRIFFOLYN® DIVISION, REEF INDUSTRIES, INC.
9209 Almeda Genoa Rd.
Houston, TX 77075
Tel: (800) 231-6074
Fax: (713) 507-4295