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ACQ is the most widely used non-asenic, non-chromium, water-based wood preservative in the world.
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Treatment Plant Performance
Environmental Profile
Approvals and Standards
Approved and standardized by industry standards
and building codes.
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Features of DRICON Fire Retardant Treated Wood
UBC Section 207 - Definition
Fire-Retardant Treated Wood is any product impregnated with chemicals by a pressure processor other means during manufacture, and which,when tested in accordance with UBC Standard No.8-1 for a period of 30 minutes, shall have a flame spread of not over 25 and show no evidence of progressive combustion. In addition, the flame front shall not progress more than 10 1/2 feet beyond the centerline of the burner at any time during the test. |
Materials which may be exposed to the weather shall pass the accelerated weathering test and be identified as Exterior Type,in accordance UBC Standard No. 23-5. Where material is not directly exposed to rainfall but exposed to high humidity conditions, it shall be subjected to the hydroscopic test identified as Interior Type A in accordance with UBC Standard No.23-5. All materials shall bear identification showing the fire performance rating thereof. Such identifications shall be issued by an approved agency having a service for inspection of materials at the factory. Section 2302.3 - Dried Fire Retardant Treated Wood
Approved fire-retardant-treated wood shall be dried, following treatment, to a maximum moisture content as follows: solid sawn lumber 2 inches(51mm) in thickness or less to 19 percent,and plywood to 15 percent.
Advantages of DRICON Fire Retardant Treated Wood
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Lumber and Plywood
Application Notes
Adjustment of design values as described will provide the maximum values to be used for Dricon FRT wood. These strength design factors reflect an appropriate strength adjustment for the pressure treatment and kiln drying of Dricon FRTW. The strength design factors are recommended specifically for lumber and plywood and are not appropriate for laminated beams, laminated veneer lumber, wood I-beams or other composite or manufactured wood products. Lumber will require an additional allowance if incised.
When untreated lumber is exposed to prolonged temperatures above 150 degrees Fahrenheit, permanent strength loss may result. Design values are applicable to members used under ordinary ranges of temperature exposure. These same limitations apply to fire retardant treated wood. To prevent excessive temperature and moisture levels, designers should provide adequate ventilation and, when necessary, place insulation on top of the roof deck and use roof coverings with low absorptivity. Dricon FRTW should not be used in roofs employing a radiant barrier located beneath the bottom surface of the sheathing. Strength Tests Using the Strength Design Factors Span Tables for Dricon fire retardant treated plywood are shown in Table B on the next page. Spans are based upon loads within the ranges associated with APA span ratings. These values were developed for dry service conditions up to 170 degrees Fahrenheit via ASTMD-5516 testing. Plywood shall be installed following nailing, spacing and all other requirements detailed in the APA Design/Construction Guide for Residential and Commercial Structures Form #E30M/1993.   General Information
Identification
Each piece of DRICON lumber and plywood is identified with the Underwriters Laboratories, Inc. stamp indicating that the product has a code recognized classification for surface burning characteristics.
 Code Recognition
DRICON FRTlumber and plywood strength design factors are recognized by all three model code agencies through National Evaluation Report No. 303. This report further recognizes fire performance, hygroscopicity, and corrosion testing of DRICON treated wood. See National Evaluation Report No. 303 for
allowable values and/or conditions of use concerning material presented in this document. As with any NER report, this report is subject to re-examination, revisions and possible closing of file.
Heat Degradation
Heat degradation is the loss of strength by a fire retardant plywood due to exposure to the high temperature and humidity levels on a roof. DRICON FRTW has never had a single heat degradation failure since being introduced in 1981.Warranty
Hickson Corporation offers builders a 40-year roof warranty against heat degradation for DRICON FRTW. The warranty provides for the repair of a roof should heat degradation cause a failure.Fastener Properties
The current industry practicefor fastener design load adjustments for fire retardant treated wood is to use a 10% reduction as specified in the "NationalDesign Specification for Wood Construction". This recommendation was based on the relationship between the strength properties of untreated wood and fire retardant treated wood. Actual tests on the strength of joints in fire retardant treated wood were not used to develop the design adjustment factor. In order to provide responsible, accurate information to users of DRICON FRTW Virginia Polytechnical Institute, Blacksburg, Virginia, was commissioned to conduct independant tests comparing the strength of various joints made with DRICON treated wood and untreated wood.
The fastener design factors are based on thea verage ratios of treated to untreated joint properties as determined from matched sets of specimens. No charge of joint strength was found in the spruce specimens, however reductions of 0 to 9 percent were found in the southern pine specimens. Using the Fastener Design Values
When the code authority with jurisdiction permits,the given fastener design factors maybe used in lieu of the 10% reduction recognized in to "National Design Specification fo rWood Construction". The fastener design factors maybe applied to the appropriate design values from Chapters 7, 8, and 9 of the National Design Specification in the same manner as the design factors for lumber previously described. When the DRICON treated wood in the joint will be normally exposed to relative humidity over 90%, the wood can be expected to exceed 19% moisture content and the appropriate adjustment factor from the DST able 4A, CM should be used. |
Termiticidal and Fungicidal Properties
In addition to excellent fire retardant characteristics, Dricon® fire retardant treated wood efectively resists attack by termites and decay in above ground, weather protected use. This includes studs, flooring, joists, trusses, sill plates, interior trim and other applications not exposed to direct wetting.
Dricon fire retardant is the only fire retardant chemical for wood treating registered with the U.S. Environmental Protection Agency. The preservative value of Dricon FRT lumber and plywood is one additional benefit of this unique product.
And now, it has proven effectiveness against termites and decay. Dricon fire retardant conforms with American Wood-Preservers' Associations Standard P5, Waterborne Preservatives, and Dricon FRT wood meets AWPA Standard C31, Lumber Used Out of Contact with Ground and Continuously Protected from Liquid Water. Termiticidal Efficacy
Mississippi State University Forest Products Laboratory conducted an evaluation of the effectiveness of Dricon FRT wood in preventing termite attack. The standard test procedures defined in American Wood-Preservers' Association Standard M12-72 were used.
Southern pine sample blocks were ressure-treated with four retentions of the Dricon formulation. These treated blocks and untreated control blocks were exposed to locally collected termites(assumed to be Reticulitermes flavipes) in an unweathered and unleached condition. In this accelerated four-week test, even the blocks treated with substantially lower than normal retentions of Dricon fire retardant chemicals exhibited excellent termite protection. All 20 blocksi n thisg roup were rated "light attack"or betterat theconclusionof thetests,and in only one instance did any termites survive. Samples treated with normal retentions showed even less damage,and termite mortality was 100% with all blocks. All untreated control blocks were rated with either "failure" or "heavy damage" and termite mortality was "slight" for each block. Fungicidal Efficacy
The evaluation of fungicidal properties was conducted at the Michigan Technological University according to ASTM D1413-76 using soil block cultures.
Test blocks were prepared from southern pine sapwood and Douglas ir heartwood. Eight replicates of each species were treated with Dricon fire retardant using commercial treating solutions and processing. The treated blocks and untreated control blocks,in an unweathered, unleached condition, were exposed to three fungal organisms (Gloephyllumtrabeum, Lentinuslepideus and Poriaplacenta) for a 12-week period. At the conclusion of the test, the blocks were examined. There was no visual evidence of decay in any blocks treated with Dricon fire retardant at normal commercial retention levels. All untreated blocks regardless of fugus species, showed decay and experienced weight losses ranging from 18.6% to 66.7%. Additional evaluations were conducted at the Hickson Technical Center. In these tests, even with less than half the commercial chemical retention, slight evidence of decay was apparent only on blocks exposed to one of the three organisms. Conclusion Limitations
Dricon FRT wood can only be used in above ground locations, protected from precipitation, regular condensation or other wetting. Exposure of Dricon treated
wood to these conditions will, over a period of time, reduce, its fire retardance and preservative effectiveness. When building codes require preservative treated lumber for weather protected applications, Wolmanized® lumber should be specified unless a local variance permitting use of Dricon FRT wood is approved.
The preservative effectiveness of treated wood is dependant on the retention and penetration of the treatingchemicals. To maintain the most effective protection against termites and decay, cut ends of Dricon treated wood should be field treated with a topically applied fungicide - termiticide. Wolman® Wood Preservative Clear is recommended for this use. For more information on Dricon fire retardant treated wood, contact your supplier or write to:
Hickson Corporation Hickson Corporation www.dricon.com For FRTW in Weather-Shielded Applications
Specification Guide for use with Section 06300
Part 1 - General1.01 Production Identification Lumber and plywood shall be pressure treated with Dricon® fire retardant chemicals or other listed chemicals with follow-up inspection provided by Underwriters Laboratories, Inc. Each piece shall bear the UL label or imprint certifying a ClassA/ClassI flame spread rating, an Interior Type A product and kiln dried after treatment (KDAT). Each piece shall carry a National Evaluation Services report number. Part 2 - Products 2.02 Plywood 2.03 Fire Retardant Treatment PART 3 - Execution 3.02 Application 3.03 Fastening |
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