Note: Diamond-Furr’s Continuous Insulation (CI) System trims are intended for use on projects complying with the new energy codes when specifying 3-coat plaster over continuous rigid insulation. When these products are used together, you will get full embedment, and strong support of the scratch coat through the millions of diamonds in the 3.4 expanded metal lath. The patented Diamond-Furr ® Furring Strips have a unique design that offers the best solution to the moisture intrusion problems that have plagued the plastering industry for decades.Ĭontinuous three-eighths inch (⅜”) furring is achieved in the field, and at every termination point, including doors and windows. This correct furring is easier to achieve when it’s fastened to Diamond-Furr®. Non-furred “flat” 3.4 expanded metal lath is a great product when it’s furred correctly. Instead, you would place small blocks of cement between the dirt and the rebar to furr it up to the center of the slab where you want it. You would never just lay the rebar on the dirt. The rebar, or metal rods support concrete in a specified grid pattern. One-eighths inch (⅛”) for the finish stucco coatĪs an example, consider the world of concrete slabs where rebar is used to reinforce the slab.Three-eighths inch (⅜”) for the brown coat.Three-eighths inch (⅜”) for the scratch coat.Why is this so important? Most three-coat plaster is seven-eighths inch (⅞”) “overall thickness”: The problem with type is that every six inches (6”) horizontally, the lath is not furred at all. These grooves also give a fastener location. These grooves provide the minimum one-quarter inch (¼”) furring “no full embedment” that’s required by ASTM. Grooved 3.4 expanded metal lath has grooves running lengthwise every six inches (6”) on the sheet. This product provides the minimum of one-quarter inch (¼”) furring “no full embedment,” but furring nails cannot be used on 3.4 expanded metal lath as they won’t fit through the diamonds. Woven wire, used in the residential wood-framed market, is fastened by hand to the walls with furring nails or staples. Here are some key elements to know about each of them: 3.4 expanded metal lathĪll of the products in this post can be purchased. The self-furring provided is usually one-quarter inch (¼”) “no full embedment,” which is the minimum requirement in ASTM 1063. Many lath manufacturers make products that are self-furred, by either crimping the wire or providing grooves in expanded metal lath products.
![metal lath and plaster walls metal lath and plaster walls](https://c8.alamy.com/comp/AGNFNG/traditional-lath-and-plaster-wall-with-laths-exposed-AGNFNG.jpg)
![metal lath and plaster walls metal lath and plaster walls](https://egyptsaudimetal.com/wordpress/wp-content/uploads/2020/12/expanded-metal-lath6.jpg)
Many experts contend that when there is a lack of furring, the scratch coat (the first layer of plaster application) will not key into the metal lath that helps provide structural support. Metal furring strips are often used for commercial projects, and in cities whose building codes require fire-proof supporting elements. Furring strips are thin strips, typically wood or metal, used to level or raise the surface of another material to level and resurface walls or ceilings, prevent dampness, or make space for insulation.
![metal lath and plaster walls metal lath and plaster walls](https://i.stack.imgur.com/I60Nc.jpg)
In construction, furring refers to the process of installing the furring strips and to the strips themselves.
![metal lath and plaster walls metal lath and plaster walls](https://empire-s3-production.bobvila.com/articles/wp-content/uploads/2019/02/Lath_and_Plaster.jpg)
Lath embedment is an often-discussed topic in the lathing and plastering industry, and the debate often ranges around one question: To furr or not to furr? Which technique provides the most proper and sturdy lath embedment for your building? What is Furring?