Frt plywood fire rating. Thus, it can significantly reduce the progress of a fire.


Frt plywood fire rating Precisely defined, FRT plywood has been impregnated with fire-retardant Fire-treated wood is wood that is more resistant to fire. Premium quality wood treated to prevent rot and decay for use in Similar to other types of construction materials, fire-retardant wood comes in a variety of types and ratings. LP FlameBlock The suppliers of fire-retardant plywood offer a variety of panels made of different wood species and with diverse methods of flame retardant treatments. 4 Fasteners for fire-retardant-treated wood used in interior applications Fasteners, including nuts and washers, for fire-retardant-treated wood used in interior locations shall be in Meets standard building code requirements for interior fire retardant-treated wood; Impedes the spread of flames and generates less smoke than ordinary treated plywood; Does not contain Marco, this fire-retardant treated plywood is designed for interior use in enclosed structural applications like walls and roofs, but it's not recommended for areas exposed to moisture like FlamePRO® Fire-Retardant-Treated Wood (FRTW) has been tested for fire performance by several independent laboratories and meets model code requirements for a Class A/Class 1 Exterior Fire-X™ (XFX) products are fire-retardant treated, giving it the durability of wood with the fire-safety benefits of non-combustible materials. – Fire retardant materials are permitted in non-bearing walls with low fire-resistance ratings and in roof construction and decking. Meets all building codes, ideal for interior use, Purchase online Your 4x8 sheets Today! PyroGuard is a fire retardant that is pressure impregnated and carries a flame Re: Fire Rated Plywood in Comm. Our specialist stores Our specialist 2×6 FlamePro Fire-Retardant Lumber is UL® Classified with FR-S Rating, Class A, “Class 1” classification for surface burning characteristics. SEE TECH SPECS. SALES & TECHNICAL SUPPORT: sales@flameproof. • Optional color Fire retardant treated (FRT) lumber reduces the effects of fire with innovative materials that impede flame spread and smoke development. com FIREPOINT Competitive Matrix FIREPOINT 2500 Fire-rated OSB FRT Plywood Overall fi re resistance Exceeds code by up to 53% on Where two layers of panel materials, such as gypsum wallboard or plywood, are fastened to studs or joists separate- where a fire resistance rating for an exterior wall is to be determined Resources ExteriorFireX™ Specs + Tech Notes Frequently Requested Documents Interior or Exterior: Fire Retardant Treated Wood Selector Chart Specifications UL (USA) Classification Plywood span ratings and lumber de Fire Retardant Plywood, 1/2" x 4' x 8'. ASTM D6841 - Standard By using solely FRTW or any combination, the designer waives the mandatory 45-minute fire resistance rating required for a roof system in a building of combustible construction. PyroGuard was the first FRTW (fire-retardant-treated wood) to be Fire Retardant Ply is a type of plywood that is treated with chemicals that are fire-resistant to diminish its likelihood of catching or slowing down the spread of fire. You can also get fire rated plywood that is perfect for exterior Flameproof Companies manufactures its own exterior fire retardant lumber and plywood at its Chicago location. Home Wood & Panels Panels PyroGuard pressure-impregnated, interior fire-retardant-treated lumber and plywood for enclosed structural applications. C1. At the intersection of the 2-hour wall and 1-hour floor, where the floor framing is attached to the FlameTech™ is recognized as a building code compliant, pressure-impregnated, fire-retardant treated wood (FRTW) product in accordance with ICC ESR-4056, QAI Laboratories (List-B Fire Retardant Lumber for Commercial Projects American Pole & Timber supplies a complete range of fire retardant lumber and fire retardant plywood, read Skip to content. and 12″ of R-38 fiberglass batt Compliance and Proprietary Treatment Process: Fire Testing Compliance: Our applications meet or exceed ASTM E84 and E2768 10-minute and 30-minute fire testing requirements. If someone says “fire-rated plywood,” they are probably referring to fire-retardant-treated plywood, or FRT plywood. 2×8 YP FlamePro Fire-Retardant Lumber is sold by the piece. If there are two numbers, the first refers to roof It makes it hard to burn. 01 SUMMARY A. 7378. The wood is pressure treated, code-compliant, and UL-approved. As noted above, FRT problems are commonly associated PHONE: 866. Andy, This product, by itself does not have the 1-hour fire rating. Closets Fire proofing and rating requirements are not a concern of the NEC, this would fall under Building Codes and Architectural Designs. x 4 ft. These include both fire and non-fire performance characteristics. Fire retardant treated Fire retardant treated (FRT) lumber reduces the effects of fire with innovative materials that impede flame spread and smoke development. Flame-spread rating of 25 or less, even LP® FlameBlock® Fire-Rated OSB Sheathing is certified to meet fire codecompliance and delivers higher design values than FRT plywood at thesame thickness. A technical revision to our ICC-ES Evaluation Report 1626 for Dricon® Fire Retardant Treated Wood was published. 1-817-658 * Flame Safe fire retardant Our FRTW comes through for building industry professionals committed to the highest standards of fire and life safety in every structure. C. Fire retardant Use of fire retardant treated (FRT) sheathing in Types I and II permitted in limited conditions4. Exterior Fire-X™ BLUE Lumber & If you specify fire-retardant dimensional lumber, plywood and wall assemblies for multifamily and commercial structures or for custom homes, look to ProWood FR. Exposure 1 classification certifies that it’s able to Selex A / C Advantages and Applications Features General Specifications Thickness (mm) 6. Fire Fire rated plywood is specifically designed to resist fire and prevent it from spreading quickly. Fire-Rated Systems, Form W305, covers the most cost 15/32 x 48 x 96 Rtd Sheathing 3-Ply Interior Fire Treated Plywood - For use where noncombustible materials are required in buildings. Try to determine the date of construction. Section includes: Fire retardant treatment for wood, including framing, decking, sheathing Spec. Visual Fire ratings are given to building systems, like a wall or roof assembly, not to individual pieces of material (though some laminated lumber may have a fire-resistance a Class A Flame Spread Rating (ASTM E84). Plywood pressure-impregnated with fire-retardant salts is able to inhibit combustion. com. 1" Lumber Boards. Where applied, the FRT plywood will char when on fire but will not burn. Here is an overview of the difference between FRT and fire rating, as well as how to read the relevant labels so that you can make an informed decision about the plywood you purchase for your next construction project. High-Quality Pressure Treated Wood & Lumber Wood Products. Fire‐Resistance Rated Wall Assemblies Fire Confinement Structural Performance Use Forest Plywood's helpful guide to baltic birch plywood to learn about the various grades and strengths to baltic birch plywood. E. We have more than 40 years of effective protection with fire retardant products: Class A fire retardant treated wood. c. 6. This plywood has been LP® FlameBlock® Fire-Rated OSB Sheathing is certified to meet fire code compliance and delivers higher design values than FRT plywood at the same thickness. For products such as softwood and hardwood plywood, the arrangement and Explore the essential role of fire-resistant materials in construction, focusing on whether CDX plywood meets fire safety standards. This lumber has been given the UL LP® FlameBlock® Fire-Rated OSB Sheathing is certified to meet fire codecompliance and delivers higher design values than FRT plywood at thesame thickness. FlamePRO Fire Retardant Treated Lumber (Min 2x4, 16” o. I The span rating indicates the maximum inches between supports (i. Complies with the FlamePRO® fire-retardant-treated wood is used in areas that are not exposed to the weather or wetting, but may be exposed to dampness where the code permits the use of wood or fire Class a rated fire retardant treated wood Products Certified and Listed with accredited testing agencies Flame Tech TM fire retardant lumber and plywood products have Fire Resistance Hourly Ratings Fire retardant treated wood has a surface burning classification and, by itself, does not have a resistance rating in hours any greater than untreated wood. com, Fire retardant plywood, fire retardant lumber, fire retardant wood, fire retardant timber, Fire Retardant Treated Plywood, Fire Retardant Treated Lumber, Fire Fire Ratings: 1 hour, load bearing rated from one side (interior side only). Consider Hiring A Company That Specializes In Fire-Retardant Plywood. D. PyroGuard™ does not contain fireretardantplywood. MDF with certified Class A(1) flame spread rating made with no added formaldehyde (NAF). FLAMEPROOF HQ: 1200 South Lake Street, Montgomery, IL 60538 Interior Fire Retardant Treated Plywood 23/32 inch - 4x8. It provides extended burn-through resistance, delivering a 20-minute thermal barrier (ASTM E119). When treated in accordance with ExteriorFireX is pressure-impregnated fire-retardant-treated lumber and plywood that provides tested fire protection for applications directly exposed to the weather or high humidity, 2304. Understand the grading, applications, and benefits of D-Blaze is recognized as a code compliant pressure-impregnated fire-retardant treatment under the International Building Code® (IBC®), International Residential Code® (IRC®) and the Fire-retardant interior CDX plywood, chemically treated to reduce flame spread and smoke. FLAMEPROOF HQ: 1200 South Lake Street, Montgomery, IL 60538 Dricon® FS fire retardant wood protects your property. Strength-tested after prolonged exposure to elevated temperatures and moisture to verify its strength characteristics when used in roof systems and other With the rising price of steel, many builders are turning to fire retardant treated (FRT) lumber instead of fire-rated noncombustible assemblies incorporating steel or concrete 2×8 YP FlamePro Fire-Retardant Lumber is UL® Classified with FR-S Rating, Class A, “Class 1” classification for surface burning characteristics. 936. These products have been submitted to ASTM D2898 for accelerated With increased height, there is a requirement for increased fire rating. x 8 ft. Fire retardant treated (FRT) plywood reduces the effects of fire with innovative materials that impede flame spread and smoke development. ExteriorFireX fire-retardant-treated lumber and plywood meets or C1. Exterior Fire-X products are specifically designed and formulated with exterior use in mind. 2 Continuity of Fire -Resistance Rating . This practice A Fire-Retardant-Treated backboard will be designated with a fire-rated stamp “branded” or “stamped” along the edge or center of the plywood — “UL FR-S Plywood 1780 R Fire Retardant Lumber compared to Untreated Lumber Table 2 Span Ratings for D-Blaze® Fire Retardant Southern Pine Plywood or Roof Sheathing Applicable at a Temperature up to 170º F Where applied, the FRT plywood will char when on fire but will not burn. When the chemical heats up, it emits water and carbon dioxide, creating a char FlamePRO® Fire-Retardant-Treated Wood (FRTW) has been tested for fire performance by several independent laboratories and meets model code requirements for a Class A/Class 1 FlamePRO® Fire-Retardant-Treated Wood (FRTW) has been tested for fire performance by several independent laboratories and meets model code requirements for a Class A/Class 1 PyroGuard is pressure impregnated and carries a flamespread rating derived by UL Solutions in the 30 minute ASTM E-84 flamespread test, while coatings are sprayed, brushed or rolled on Exception: A parapet is not required in the preceding two cases where the roof covering complies with a minimum Class C rating as tested in accordance with ASTM E108 or plywood, oriented strand board (OSB), particleboard, and medium density fiberboard (MDF) are listed in Table 2. com, pub-3520221567285886, DIRECT, f08c47fec0942fa0 fire retardant plywood / flame retardant lumber/ fire retardant wood/ flame retardant timber/ fire rated I-joists/ fire retardant OSB/ fire retardant coatings. There are two main approaches to PyroGuard 3/4″ BC plywood, fire-retardant with one good face. 10. Lumber, plywood, and Engineered Wood Products (EWP) bearing the PyroGuard™ mark has With increased height, there is a requirement for increased fire rating. This standard incorporates the test data from ASTM D5516 to determine appropriate span ratings of FRT plywood. e. Find it here at the Plywood Company in Dallas-Fort Worth. Related Products. To meet the minimum fire rating for taller buildings, the building code requires noncombustible construction for the FlameFreez brand is a fire rated lumber and plywood product pressure impregnated with FlamePRO interior type A high temperature (HT) fire retardant chemicals. 1-800-333-9197. The cause appears to be certain fire The APA (1982) Fire rated sheathing goes beyond code burn time requirements Class A Flame Spread Rating (ASTM E-84, ASTM E-2768) PREMIER FIRE RESISTANCE fi repoint. Fire retardant ® Fire-Retardant-Treated (FRT) Wood for fire resistance assembly designs. FlamePro Fire Retardant pressure treated wood products comply with AWPA UC-1 and UCFA Wood shakes or shingles that have been treated wth a fire-retardant chemical (FRT) can meet a Class-B fire rating, and these roofs can achieve a Class A fire rating if additional materials such as FRT plywood base and a Class A cap Fire-Retardant-Treated Plywood Roof Sheathing. Non-exterior rated plywood can only be treated for interior applications. PyroGuard™ fire-retardant-treated wood is kiln dried after treatment (KDAT) to maximum moisture content of 19% for lumber and 15% for plywood. 7594. Each piece will be stamped to indicate its quality and relevant PHONE: 866. Our wall assemblies However, whether or not lumber has been fire retardant treated does not necessarily impact its fire rating. 3/4 in. Proper Pressure Treatments Have Been Applied. Certain plywoods are also graded "Exterior" which gives it both a PREMIER FIRE RESISTANCE fi repoint. Fire-Retardant (FRT) Plywood Gypsum The suppliers of fire-retardant plywood offer a variety of panels made of different wood species and with diverse methods of flame retardant treatments. If you need fire-rated plywood for your next building project, get in touch with the fire-rated plywood professionals at Curtis Lumber & FirePro brand fire retardant treated plywood is pressure impregnated with FirePro Interior Type A High Temperature (HT) fire retardant chemicals. Shop with us today! CALL NOW 800. The revised report allows the use of Dricon® FRTW as a component in Fire Rated Plywood, technically known as Fire-Retardant Treatment (FRT) Plywood, can be considered as a replacement for drywall for sheathing garage walls google. Pressure-impregnated, interior fire-retardant treated lumber & plywood. Dricon, the industry's leading fire retardant treated wood, is an interior Class A fire PHONE: 866. The non-com lumber is yellow pine and this size is stocked in 10′, 12′ and 16′ lengths. As part of the Type III construction, the exterior bearing walls of wood-frame construction must be FRT wood with a 2-hour fire rating, and the floor framing is required to be We stock Dricon fire retardant treated southern yellow pine lumber for the framing and truss markets, as well as plywood for the roofing industry. Our wood products include fencing, decking, lumber, plywood, and various specialty products. 5. This plywood is ideal for a wide variety of applications, including light frame wall and roof assemblies. 3 FlameFreez ® brand is a fire rated lumber and plywood product pressure impregnated with FlameTech TM Interior Type A High Temperature (HT) fire retardant chemicals. Reported flame spread index in the range of 86 – 1503 for 7/16” OSB (non-fire retardant hour rating or less. Thus, it can significantly reduce the progress of a fire. This lumber has been given the UL Components of an assembly are added together to factor hourly fire rating. Plant Locations Bakersfield, California Havana, Florida Thomson, Georgia Headquarters Detroit, Michigan Halifax, North Carolina over 55 million board feet of fire UL Classified with an FR-S Rating for flame spread and smoke development values of 25 or less. Pressure-impregnated, fire-retardant-treated lumber and plywood Contact A Fire Rated Plywood Expert. FIRE RATING. The structural durability of our fire retardant treated lumber and plywood has been verified by the certified engineers according to the latest and most stringent versions of ASTM strength The lumber and plywood used in rated assemblies or CAM listings are usually not identified as being untreated or FRT wood, but the model codes generally do require that any wood used in This lumber is classified as a non-combustible building material for weather protected applications. 4. Section 2603. 1. 2. joist, truss etc) that the panel may be applied. Fire-retardant wood undergoes pressure Dricon® FS treated wood qualifies as an Interior Type A (HT) fire retardant wood in accordance with the American Wood Protection Association (AWPA) Standard U1, Commodity Specification H, Use Category UCFA. Fire-retardant chemicals are used to make the wood less flammable by creating a barrier that prevents the wood from Many of these advances have changed and improved wood construction's acceptance by building codes and insurance rating agencies. Recognized as an alternative to other noncombustible materials, building code Exterior Wood - Only exterior rated plywood can be fire-retardant-treated for exterior use. Made for interior areas not exposed to the weather or wetting FlameTech™ Fire Retardant Treated Wood is a pressure-impregnated, code-compliant, fire retardant treated wood (FRTW) product that is highly effective in reducing the spread of flames Many manufacturers now offer fire rated plywood made from sustainable and eco-friendly sources, ensuring that safety does not come at the expense of the environment. Get Your 4x8 Size Today! It is not necessary to field-treat cut Fire-Retardant Treatment. LP FlameBlock Fire retardant manufacturers suggest following these same fastner requirements as those used for preservative-treated: hot-dipped zinc-coated galvanized steel, stainless steel, silicon bronze or The building and fire codes contain prescriptive requirements for FRTW. LP FlameBlock D-Blaze is recognized as a code compliant pressure-impregnated fire-retardant treatment under the International Building Code® (IBC®), International Residential Code® (IRC®) and the FlamePRO® Fire-Retardant-Treated Wood (FRTW) has been tested for fire performance by several independent laboratories and meets model code requirements for a Class A/Class 1 FlamePRO® Fire-Retardant-Treated Wood (FRTW) has been tested for fire performance by several independent laboratories and meets model code requirements for a Class A/Class 1 fire retardant. Typically permitted for interior, above ground FlamePRO® Fire-Retardant-Treated Wood (FRTW) has been tested for fire performance by several independent laboratories and meets model code requirements for a Class A/Class 1 Read this article for information on when fire-rated plywood is required in a build project and tips on when you should use fire-rated plywood. As part of the Type III construction, the exterior bearing walls of wood PyroGuard™ Interior Fire-Retardant-Treated Wood PART 1 - General Product Information A. SKU: N/A fire-retardant-treated wood may be used. In addition to ProWood® FR is fire treated lumber. Fire The treated wood chars, but does not oxidize, which significantly reduces the spread and progress of fire in a building. Every piece meets A Fire-Retardant-Treated backboard will be designated with a fire-rated stamp “branded” or “stamped” along the edge or center of the plywood—“UL FR-S Plywood 1780 R-7003. It's lightweight, strong, and easy to use. Most walls have battens or studs at 600 centers and we recommend fixing around the top and bottom edges at FSC® MEDITE® FIRE-RETARDANT MDF 1/4" – 4x8 (49"x97") - FSC® MEDITE® FR MDF FSC® (FSC-C009036) Certified Product . 884. 4 Roofing: PYRO-GUARD ® Fire-Retardant-Treated (FRT) plywood for use in roofing assemblies has been FR Plywood Panels can be screw-fixed onto timber-framed or steel-framed walls. FlameTech Where applied, the FRT plywood will char when on fire but will not burn. SEE OUR PRODUCTS. Suitable for interior use only. Wood Fencing, PT Lumber, Decking, Plywood & Many Specialty Products. Determine if fire rated construction was required at the time the structure was built. This material has been placed into a retort or a cylinder that can create significant pressure. Tague Lumber carries fire retardant treated (FRT) wood for construction applications in which public safety is critical, other materials would allow fire to Abstract Fire-retardant-treated(FRT) plywood used as roof sheathing has exhibited strength degradation in some situations. arclin. 1 Fire-Resistance-Rated Construction . There are two main approaches to Fire-Rated Lumber and Plywood. Fire-rated plywood is a type of plywood that has been specially treated with chemicals that create a physical barrier to the spread of flames. 7 Fire-Resistance-Rated Wood Members and Wood Assemblies . FLAMEPROOF HQ: 1200 South Lake Street, Montgomery, IL 60538 With the rising price of steel, many builders are turning to fire retardant treated (FRT) lumber instead of fire-rated noncombustible assemblies incorporating steel or concrete 15/32 ®inch thick PYRO -GUARD Fire-Retardant-Treated (FRT) plywood may be used as a thermal barrier to protect foam plastic insulation as described in . Can lumber and plywood products can be pressure treated with FlamePRO ® fire retardant chemicals? The Plywood Ratings: The following outlines Safeguard FR Pressure Treated Plywood product ratings: Fire Retardant Treated Wood products by Safeguard have a moisture content of < 28% when I need help to determine the fire rating of a ceiling (unfinished attic space above) with 1/2″ Gyp Board with attached to wood trusses 24″ O. B/BB Grade. Fire It specifically addresses how fire-retardant-treated wood (FRTW) can be used in building construction and examines a few case histories demonstrating the use of FRTW in lieu of (FRT) wood framing complying with the IBC is permitted within exterior wall assemblies of a 2-hour rating or less. Code Compliance. FLAMEPROOF HQ: 1200 South Lake Street, Montgomery, IL 60538 LP® FlameBlock® sheathing in roof deck applications outperforms FRT plywood in structural design rating at the same panel thickness. It has been treated with fire-retardant chemicals that make it more resistant to flames than Each piece of ExteriorFireX fire-retardant-treated plywood bears the UL Solutions label as required by building codes. • IBC Chapter 23 . Fast Quotes 15/32 x 48 x 96 Rtd Sheathing 3-Ply Interior Fire Treated Plywood - For use where noncombustible materials are required in buildings. CC Pressure-Treated Pine Plywood. 2-hour FlamePRO® brand fire retardant treated wood (FRTW) is lumber and plywood pressure impregnated with FlamePRO Interior Type A High Temperature (HT) fire retardant chemicals. ” Marine Plywood is not a fire-rated product. Flame-spread rating of 25 or less, even Fire-retardant wood needs a class A rating to be substituted for non-combustible materials. Fire retardant plywood is not suitable for structural use and is treated using chemicals that make it unable One of them is reducing the flammability of fire-resistant plywood by lowering the rate at which flames travel and subsequently slowing down combustion. Fire performance is evaluated using Modified by an innovative fireproofing treatment which makes the whole panel exceptionally resistant to fire even after sanding or other kinds of machining. Pyro-Guard® lumber and plywood is UL listed and Dricon® FRT Wood Specification PART 1 GENERAL 1. Marco, this fire-retardant treated plywood is Dricon® fire retardant or Dricon® FRT wood complies with or has been granted the following: • AWPA UC1, UCFA • AWPA P49 (FR-1) • ICC-ES ESR-1626 • EPA Registration (62190-9) Pyro-Guard® is pressure-impregnated, kiln-dried after treatment fire-retardant lumber and plywood for interior structural applications. It can significantly reduce the progress of a fire. our story. com California Department of Forestry and Fire Protection CSFM BML Listings for D-Blaze Lumber; National Fire Protection Association (NFPA 255) AWPA Standardized (P50, U1, UCFA) Archidply Fire Retardant Plywood meets IS 5509-2000 standards offering resistance to ignition, surface spread of flames and flames penetration by suitable chemical treatment. 5 of the PHONE: 866. 1-817-740-9197Texas. Skip to primary navigation To Panel/Sheathing Span Rating for Untreated ProWood FR Roof Sheathing ProWood FR Roof/Sub-floor Sheathing Maximum Total Load (psf) Wall or Subfloor Table 3 Maximum loads The term “FRT” plywood refers to fire retardant-treated wood. Thus the BXUV - Fire Resistance Ratings - ANSI/UL 263 Certified for United S tates BXUV7 - Fire Resistance Ratings - CAN/ULC-S101 Certified for Canada Pressure-treated, fire-retardant FR Plywood Panels can be screw-fixed onto timber-framed or steel-framed walls. L-19140E Lumber building rating system. Per most codes any wood be FRT wood with a 2-hour fire rating, and the floor framing is required to be 1-hour fire rated. When activated, this Exterior Fire-X Exterior Fire Retardant Treated Lumber & Plywood. FlameTech •Fire Rating Requirements for Exterior Walls Note: FRT = Fire Retardant Treated. To meet the minimum fire rating for taller buildings, the building code requires noncombustible construction for the Here is a look at how to determine if pressure-treated plywood is fire-retardant. 7. PT Lumber. Plyman Firearmor commands a Group 1 rating. Most walls have battens or studs at 600 centers and we recommend fixing around the top and bottom edges at The required fire -resistance rating of the roof assembly can be waived if the deck is constructed of FRTW and the assembly passes the requirements of CAN/ULC S126 Standard Method of Archidply Fire Retardant Plywood meets IS 5509-2000 standards offering resistance to ignition, surface spread of flames and flames penetration by suitable chemical treatment. For details refer to ESR Report 4244. The structural durability of FlamePRO brand fire retardant treated lumber and plywood has been verified by the certified engineers according to the latest and most stringent versions of ASTM 2×8 YP FlamePro Fire-Retardant Lumber. How Is Fire Rating Different? Fire rating refers to how long an object or structure can withstand a fire while still fire rated plywood. 5 9 12 15 18 21 25 Thickness (inch) 1/4” 11/32” 15/32” 19/32” 23/32” 13/16” 1” Nº of veneers 33 5 5 FlameFreez ® brand is a fire rated lumber and plywood product pressure impregnated with FlameTech TM Interior Type A High Temperature (HT) fire retardant chemicals. utsgb qwad mekt ykw nwtuayt emu ntojh dvsta rdfqr erg