1.4.5 AWCI Technical Manual 12-B 'Standard Practice for the Testing and Inspection of Field Applied Thin-Film Intumescent Fire-Resistive Materials; an Annotated Guide', Latest Edition. 1.5 SYSTEM DESCRIPTION 1.5.1 The intumescent fire protection materials shall be applied at the required thick- ness to provide the UL fire resistive ratings. Technical Manual 12-B Standard Practice for the Testing and Inspection of Field Applied Thin-Film Intumescent Fire-Resistive Materials Association of the Wall and Ceiling Industry (AWCI) on Amazon.com.FREE. shipping on qualifying offers. Technical Manual 12-B. Steel substrate temperature shall be a minimum of 5 deg F 3 deg C above the dew point of the surrounding air for a period of 24 hours prior and during the application of the material. Jones is AWCI’s director of technical services. That’s where reading the earlier material comes in handy. Download Song Sochta Hoon Uska Dil Kabhi Mujhpe Aaye Toh.
DeFelsko offers many models of the PosiTector 6000 thickness gage that are ideal for measuring the total thickness of intumescent fire resistive coatings. Selection is primarily dependent on the expected coating thickness.
Background
Intumescent fire resistive coatings are applied to steel building supports such as beams, channels, pipes and tubular columns to protect their structural integrity in fires. DeFelsko manufactures hand-held, non-destructive gages that are ideal for measuring the dry film thickness of these coatings and for ensuring that they are applied under ideal conditions.
Although steel does not burn, it can be severely weakened when exposed to high temperatures for extended periods, such as in a building fire. It is believed that such damage led to the collapse of the World Trade Centre towers Since the attacks of 9/11, greater attention has been focussed on the development and application of better and more durable intumescent coatings.
When exposed to fire, an intumescent coating generally expands in thickness by 15 to 30 times in a standard test1, forming a thick layer of foam that protects the steel by thermally insulating it from the heat. Some manufacturers report expansions as great as 100 times for unspecified conditions.2 As part of the expansion process, most coatings generate an outer ash-like char layer. As the fire continues, the ash coating erodes, exposing the remaining intumescent coating to form more char. Depending on the coating thickness, this process repeats itself several times.1
Intumescent fire resistive coatings generally require a primer for adherence. A decorative/protective topcoat may also be necessary – especially in humid environments. A reinforcing mesh can be used to better retain the char layer on certain shapes.
Measurements Key to Quality Assurance
The effectiveness of an intumescent fire resistive coating depends on the coating thickness and its ability to retain the ash layer. Coating thickness typically ranges from 30 to 500 mils (0.8 to 13 mm). The applied thickness must meet the product specifications for the type of structure being coated and the applicable building code requirements (e.g., to withstand a fire of a certain temperature and duration).
As intumescent fire resistive coatings can be quite expensive ($4 to $12 per square foot, depending on the application and required rating), measuring the coating thickness can play an important role in controlling the application costs.
Proper adhesion is also essential to the effectiveness of these coatings. As the adhesion is strongly affected by the climatic conditions at the time of application, manufacturers generally specify the range of conditions for which their products may be applied – e.g., relative humidity, air temperature and the difference between the surface and dew point temperatures.3 and 4 Therefore, it is important to carefully monitor the climatic conditions when applying intumescent coatings.
DeFelsko manufactures gages that are ideally suited for measuring the thickness of intumescent fire resistive coatings and for monitoring the humidity and temperature when they are applied.
DeFelsko’s Dry Film Thickness Measurement Solution
DeFelsko offers many models of the PosiTector 6000 thickness gage that are ideal for measuring the total thickness of intumescent fire resistive coatings. Selection is primarily dependent on the expected coating thickness.
The PosiTector 6000FT series are ideal for measuring coating thickness up to 250 mil (6.4 mm). These gages provide results with a maximum accuracy of ± 0.5 mil (0.01 mm) + 1% of reading for measurements less than 100 mil (2.5 mm). For readings over 100 mil (2.5 mm), the accuracy is ± 0.5 mil (0.01 mm) + 3% of the reading.
The PosiTector 6000 FKS series is recommended for thicker applications up to 500 mil (13 mm), for which the gages provide results with an accuracy of ± 1 mil (0.02 mm) + 3% of the reading.
The PosiTector 6000 FLS series is available for very thick applications up to 1.5 inches (38 mm), with an accuracy of + 0.01 in. (0.2 mm) + 3% of the reading.
Downloading the measurements from the PosiTector 6000 is as seamless as storing it to a USB data stick or connecting a USB cable to a computer. These features allow for convenient printing and further analysis on a PC. The data logging and downloading capabilities allow an operator to easily track variations in coating thickness through multiple measurements over large areas. The Advanced models come with wireless WiFi and Bluetooth® connections. See our PosiSoft Solutions page for more information.
A detailed brochure can be downloaded here.
PosiTector 6000 Complies with Industry Best Practice
The use of PosiTector 6000 gages to measure intumescent coating thickness complies with accepted industry best practice. The National Fireproofing Contractors Association5 publishes a quality assurance procedure for the application of intumescent coatings.6 This procedure requires that the “final thickness must be measured with a dry film thickness gauge in accordance with AWCI [Association of the Wall and Ceiling Industry7] Technical Manual 12-B, ‘Standard Practice for the Testing and Inspection of Field Applied Thin-Film Intumescent Fire-Resistive Materials; an Annotated Guide.8 ”
While the AWCI guide notes that coating thickness measurements should be made with a gage approved by the building authority having jurisdiction, it lists only two acceptable measurement techniques: magnetic pull-off gages and magnetic flux-based sensors. The PosiTector 6000 gages use the latter accepted approach.
With reference to the AWCI guide, at least one intumescent coating manufacturer (A/D Fire Protection Systems) lists DeFelsko as a manufacturer of suitable dry film gages for measuring coating thickness.8
DeFelsko’s Climatic Condition Monitoring Solution
As noted above, intumescent fire resistive coatings should only be applied under ideal ranges of relative humidity and temperature.
The PosiTector Dew Point Meter (DPM) measures and records climatic conditions including: relative humidity, air temperature, surface temperature, dew point temperature and the difference between surface and dew point temperatures.
The figure below shows the DPM along with the following standard measurements on the LCD display: the % relative humidity (%RH), ambient air temperature (Ta), surface temperature (Ts), dew point temperature (Td), and surface temperature minus dew point temperature (Ts-Td). All five of the climatic conditions are monitored and calculated at the same time and, at the press of a button, the readings can be stored in memory along with the date and time. The DPM also has a unique auto logging feature that automatically records datasets containing all 5 climatic conditions at a user-selected time interval. This is useful for maintaining a complete record of environmental conditions and trends leading up to, during, and after the application of an intumescent coating.
Free Consultation
For current pricing or to order these instruments, please contact us by e-mail at techsale@defelsko.com, by telephone at (315) 393-4450 or by fax at (315) 393-8471. If you require additional technical information or have questions relating to your particular application, we encourage you to take advantage of our years of experience in recommending the best gage for your needs.
References
1. http://www.ul.com/global/eng/pages/offerings/perspectives/regulator/building/fireresistance/
2. http://www.nullifire.com/products/intumescent_coating_intro.php
3. http://solutions.3mcanada.ca/wps/portal/3M/en_CA/FireProtection/Home/Prod/FireDam/LearnMore/ (select 'Specifications”)
4. http://www.adfire.com/ (select “Application Guide”)
5. The NFCA represents contractors that install passive fireproofing products to building structures and manufacturers of the products (www.nfca-online.org). The association provides a training program for special inspectors who desire to learn proper inspection and test procedures for the inspection of ... intumescent materials applied to structural steel members. (http://www.nfca-online.org/ICC_Inspector.html). 1.
6. http://www.nfca-online.org/NFCA%20400%20Final%20052308.pdf
7. The AWCI represents over 2,200 companies and organizations involved in a variety of building systems – including fireproofing (www.awci.org).
8. The AWCI guide is available by ordering through: http://store.awci.org/cgi-bin/awci/product?;22
AWCI Technical Manual B, “Standard Practice for the Testing and Inspection of. Field Applied Thin-Film Intumescent Fire-Resistive Materials. Provides field inspection procedures for the testing of thin-film intumescent fire- resistive materials. Includes testing criteria for thickness measurement of applied . AWCI Technical Manual B, Standard Practice for the Testing and Inspection of Field Applied Thin-Film Intumescent Fire-Resistive Materials; an Annotated.
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Packaged materials must bear the appropriate labels, seals and designated certification mark for fire resistive ratings. Approved by the factory manufactured architectural fire protection material manufacturer and applied in accordance with the topcoat manufacturer’s documented instructions. All products listed in this section must be manufactured manua the appropriate follow-up service with each container bearing the certified label mark.
International Protective Coatings is the leading supplier of high performance Protective Coatings and forms part of Akzo Nobel, a market driven, technology based company specializing in Coatings, Chemicals and Pharmaceuticals.
AWCI’s Construction Dimensions – October 2013
Verify that all clip hangers, manial, ducts, equipment or other items which would interfere with the installation of the factory-manufactured architectural fire protection system are not positioned or installed until installation is complete. Delete paragraphs not applicable.
Company specializing in installing the work of this section with a minimum of three years documented experience and certified by the material manufacturer.
Temperature and Humidity Requirements: The relative humidity of the application area shall not exceed a maximum of 85 percent for 24 hours prior, during and 24 hours after the application of the material. Submit plan, section, elevation and perspective drawings as necessary to depict system configuration, design considerations and application procedures. The application awfi be witnessed by the Architect’s or Owner’s representative and is subject to their approval.
Provide a mock-up for evaluation of surface preparation techniques and application workmanship. Final color, gloss and finish will be determined and approved by the Architect.
Awci Technical Manual 12-b Download
Technical Manual 12-B
Fire Resistive Directory, Volume 1; Current edition. Thickness determinations shall be made at nine locations around the beam, at each end of a in. Submit applicator’s current certification as a manufacturer trained and approved installer. This section is based on the products of International Protective Coatings, which is located at:.
That’s where reading the earlier material comes in handy. Do not commence installation of the factory manufactured architectural fire protection system until the contractor, installer and inspector have examined the surfaces to receive the fire protection and determined the surfaces are acceptable to receive the fire protection material. A copy of the transport document and manufacturers conformance certificate shall be attached to the material 12-n QC form. When I first encountered this instruction many years tecunical, I happened to be observing a fire test of a new formulation of an intumescent coating in a small-scale furnace conducted by asci of our manufacturer members.
What could have caused this, and how do we avoid it recurring? Sample frequency will waci pre-determined by the architect and testing performed by an independent testing laboratory or the factory-manufactured architectural fire protection manufacturer.
SECTION ARCHITECTURAL INTUMESCENT FIRE PROTECTION
Maintain air temperature and relative humidity in areas where products technnical be applied for a time period before during and after application as recommended by manufacturer.
The magic drawing was a crude 3-dimensional image of an I-beam showing some of the nine points to be measured and then, swci inches further techincal the beam, was another set of points to be tested. The following is one example of how a mock-up on a large project might be specified. Interchar is primarily a spray applied material, and performs without the requirement for any reinforcement. If necessary for job schedule, the General Contractor shall provide enclosures and heat to maintain proper temperatures and humidity levels in the application areas.
The use of a bonding agent may also improve the bond of portland cement plaster applied over relatively slick concrete, but the literature warns that one should ensure that it is an exterior grade bonding agent because a cheaper interior grade of bonding agent may not provide adequate bond.
Upon completion of installation, all excess material, overspray and debris must be cleared and removed from the job site. Architectural Fire Protection Factory Manufacturer: Provide masking, drop cloths or other suitable coverings to prevent overspray onto awcl not intended to be affected by Work in this section.
Jones is AWCI’s director of technical services. Delete options for Application not required for project.
Store and dispose of hazardous materials, and materials contaminated by hazardous materials, in accordance with requirements of local authorities having jurisdiction. Deliver materials in manufacturer’s original, sealed, undamaged container with identification label intact.
All batch number, product identification and quantities shall be recorded on appropriate QC documents. A pair of measurements 12 inches apart on a given beam in no particular, random location along the beam — the tested area could be near an end or in the middle of the span.