{"id":4587,"date":"2023-04-24T15:13:01","date_gmt":"2023-04-24T19:13:01","guid":{"rendered":"https:\/\/havenearth.biz\/2023\/04\/24\/hemp-lime-passes-astm-r-value-tests\/"},"modified":"2023-04-24T15:13:01","modified_gmt":"2023-04-24T19:13:01","slug":"hemp-lime-passes-astm-r-value-tests","status":"publish","type":"post","link":"https:\/\/havenearth.biz\/2023\/04\/24\/hemp-lime-passes-astm-r-value-tests\/","title":{"rendered":"Hemp-Lime Passes ASTM R-Value Tests"},"content":{"rendered":"
Hemp-lime (‘hempcrete\u2019) slabs are measured for ASTM thermal resistance testing at<\/em> \u00a0R & D Services in Watertown, TN. Photo courtesy of Americhanvre Cast Hemp<\/em><\/p>\n<\/figcaption><\/figure>\n <\/p>\n Global Fiber Processing<\/p>\n <\/p>\n Americhanvre <\/p>\n <\/p>\n Hemp Build Network <\/p>\n <\/p>\n Texas Healthy Homes<\/p>\n <\/p>\n South Bend Industrial Hemp<\/p>\n <\/p>\n Hemp Building Company<\/p>\n <\/p>\n Nature Fibres<\/p>\n <\/p>\n Hempknowlogy<\/p>\n by Jean Lotus<\/em><\/p>\n Hemp-lime insulation has passed US tests for thermal resistance (R-Value), performing the necessary testing required by the Federal Trade Commission to advertise the insulative value of a material.\u00a0<\/p>\n Hemp-lime (or \u201chempcrete\u201d) long ago passed insulation testing (U-value) in Europe, but official testing had not been performed in the United States, where industrial hemp for building materials was only approved to grow since the 2018 Farm Bill.\u00a0\u00a0<\/p>\n The tests were performed by Pennsylvania-based Americhanvre Cast Hemp, using samples created with the Ereasy Spray Apply system and the proprietary Ereasy binder. Hemp-lime (or \u201chempcrete\u201d) slabs of 2\u201d, 4\u201d and 6\u201d were tested under the ASTM C-518 R-value testing.\u00a0<\/p>\n Testing at R & D Services in Watertown, TN, showed hemp-lime to have an R-value of 2.2 per inch.<\/p>\n Subscribe for HempBuild Magazine\u2019s free newsletter<\/strong><\/a><\/p>\n The tests were performed to streamline the hemp-lime building industry in the United States, the company said.\u00a0\u00a0<\/p>\n As compared to traditional batt or foam insulation, the R value per inch for hempcrete is lower, Cameron McIntosh, owner of Americhanvre told HempBuildMag in an email.<\/p>\n \u201cHowever [hemp-lime] has thermal inertia that those materials do not have,\u201d McIntosh said. \u201cIn other words, hemp-lime does more than reflect hot and cold energy – it absorbs, maintains and slowly dissipates that energy over a longer period of time, leading to more dynamic performance,\u201d McIntosh said.\u00a0<\/p>\n Additionally, \u201cWhen spray applying or casting by hand in situ, hempcrete in a wall assembly can create what we call a monolithic or un-interrupted envelope of insulation around the entire structure,\u201d McIntosh added.\u00a0<\/p>\n Americhanvre, based in Wescosville, PA, is the US distributor for the Ereasy hemp-lime spray casting system. Cameron McIntosh, founder of Americhanvre Cast Hemp.<\/em><\/p>\n<\/figcaption><\/figure>\n The FTC requires<\/span><\/a> that R-values of insulation be disclosed as tested by a range of ASTM tests, including C-518.\u00a0<\/p>\n \u201cThis test is required by the FTC, but not necessarily by the local code office,\u201d McIntosh said.\u00a0<\/p>\n Rules for Hemp-lime in US building codes under the International Residential Code Index<\/span><\/a> give a general table of thermal performance that is conservative, McIntosh said. \u201cWe are now able to prove to local code enforcement that the Ereasy Spray Applied Hempcrete System actually exceeds the standards laid out in the [building codes].\u201d<\/p>\n Jacob Waddell, president of the nonprofit Hemp Building Institute<\/span><\/a>, was hired as a building materials expert to assist Americhanvre with testing.\u00a0<\/p>\n \u201cThe [ASTM] testing confirmed what the European tests had shown and the R-value was on the top end of those values that have been used when designing with hemp-lime for decades,\u201d Waddell told HempBuild Mag in an email.\u00a0<\/p>\n <\/p>\n Graymont Ltd. <\/p>\n <\/p>\n Homeland Hempcrete<\/p>\n <\/p>\n HempStone <\/p>\n <\/p>\n Midwest Natural Fiber<\/p>\n \u201cThese test results are the first example of what should become common in the US hemp-lime industry. As we become more widely used, we will need to follow procedures and rules that match with the expectations of the modern building industry,\u201d he added.\u00a0<\/p>\n Read more about the ASTM test results HERE.<\/span><\/a>\u00a0<\/p>\n The Ereasy spray-applied system in use in a hempcrete installation in the United States. Photo courtesy of Ereasy.<\/em> <\/p>\n<\/figcaption><\/figure>\n <\/p>\n US Hemp Building Assn. <\/p>\n <\/p>\n HEMPALTA<\/p>\n <\/p>\n Sativa Building Systems<\/p>\n <\/p>\n Prairie PROducers <\/p>\n <\/p>\n Haven Earth<\/p>\n <\/p>\n Hemp and Block LLC<\/p>\n <\/p>\n US Heritage Group <\/p>\n <\/p>\n Hemp Eco Systems<\/p>\n <\/p>\n <\/a> Offered as part of a special partnership between USHBA and HempBuildMag. HempBuildMag receives a commission through this arrangement.<\/em> <\/p>\n<\/figcaption><\/figure>\n <\/p>\n Hearts of Mercy <\/p>\n <\/p>\n Hemp Building Directory <\/p>\n <\/p>\n Old Pueblo Hemp Co.<\/p>\n (To find out more about advertising CLICK HERE<\/a>).<\/p>\n Help Wanted:<\/strong><\/p>\n Texas: Careers in Hemp Building, a modern take on the historic craftsman. Salary Range $32,000-$65,000<\/a><\/p>\n<\/li>\n<\/ul>\n Publications<\/strong><\/p>\n Hemp Building Directory 2023 – Guide to the International Hemp Building Industry<\/a><\/p>\n<\/li>\n Available Now! \u201cHemp Buildings – 50 International Case Studies\u201d by Steve Allin<\/a><\/p>\n<\/li>\n<\/ul>\n Hemp Building Research and Training<\/strong><\/p>\n Hearts of Mercy Sponsors Hemp Building Research at Kansas State University <\/a><\/p>\n<\/li>\n<\/ul>\n Hemp Hurd (shivs)\/Hemp Fiber\/ Hemp Microfiber<\/strong><\/p>\n Hemp Building Company: Hempcrete Supplies, Training Programs. Longmont, CO<\/a><\/p>\n<\/li>\n Global Fiber\u00a0Processing: Made From American Hemp<\/a><\/p>\n<\/li>\n South Bend Industrial Hemp: 100% American Hemp for Building<\/a><\/p>\n<\/li>\n PROducing Sustainable Fibers for Environmentally Conscious Consumers – Prairie PROducers<\/a><\/p>\n<\/li>\n Midwest Natural Fiber: US Grown Hemp<\/a><\/p>\n<\/li>\n HEMPALTA – Canada: Hemp to better serve the planet.<\/a><\/p>\n<\/li>\n<\/ul>\n Hempcrete installers\/Insulation subcontractors<\/strong><\/p>\n Americhanvre Cast Hemp: Supplies, Equipment, Experienced Hempcrete Installation<\/a><\/p>\n<\/li>\n Stuc-Go-Crete: Hempcrete and Stucco for the Heartland<\/a><\/p>\n<\/li>\n<\/ul>\n Hemp Build Network: We Make Building with Hemp Possible<\/a><\/p>\n<\/li>\n Hempknowlogy: Home of the Hempjet: America\u2019s first hempcrete spraying system. Manchaca, TX<\/a><\/p>\n<\/li>\n Haven Earth PMA Hemp Consultancy<\/a><\/p>\n<\/li>\n Design and build your Hempcrete home with HempStone LLC complete consultants<\/a><\/p>\n<\/li>\n<\/ul>\n Lime Binder<\/strong><\/p>\n Graymont Lime for Your Natural Building Needs<\/a><\/p>\n<\/li>\n US Heritage Group: Experienced Hemp Building Binder Suppliers<\/a><\/p>\n<\/li>\n Hemp Eco System Materials Now Available in the USA<\/a><\/p>\n<\/li>\n<\/ul>\n Hemp Batt Insulation\/Supplies<\/strong><\/p>\n Nature Fibres: Natur-Chanv\/Hemp batt insulation<\/a><\/p>\n<\/li>\n<\/ul>\n Hemp Wall Panel Products<\/strong><\/p>\n Preorder your hempcrete tiny house from Sativa Building Systems<\/a><\/p>\n<\/li>\n Panel solutions from Homeland Hempcrete<\/a><\/p>\n<\/li>\n<\/ul>\n Hemp Blocks<\/strong><\/p>\n
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