Metallic Mesh
Alkali resistant fiberglass mesh fabrics:everything you would like to know
2nd part
please read 1st part here
Mesh dimensions and uses (continues…)
Mesh dimension 3x3mm: Used mainly for the preparation of cement boards.
Mesh dimension 4x4mm: Depending on the weight this item has more than one uses.
At a weight of 160gr/m2 this is the commonest fiberglass mesh fabric to be used as an integral part in EIFS or ETICS.
At a weight of 80-100gr/m2 it is used for the reinforcement of ready to use plasters in the interior.
Mesh dimensions 5x5mm or 6x6mm: These alkali resistant fiberglass mesh fabrics are used to reinforce prepackaged plasters in the interior.
Usual weights: 80-110gr/m2.
Mesh dimensions 10x10mm to 12x12mm: These types – usually colored – are used to reinforce in situ produced stuccos/renderings and screeds.
Usual weights: 110-200gr/m2. They are used for interior and exterior applications.
Finally there are the “panzer” type fiberglass mesh fabrics which are extremely strong and come at weights usually more than 300gr/m2.
They are used to reinforce renderings against impact in public buildings. Typically they have more than one yarns in the warp direction.
6. Tensile strength is one of the most important criteria we use in order to choose an alkali resistant fiberglass mesh fabric. It’s expressed in N/5cm units calculated for both directions.
7. Tensile strength after immersion in a strongly alkaline solution – usually a 50% concentration solution of NaOH – is very critical. This test is a simulation of the influence of lime/cement on the mesh. It gives a safe prediction for the future behaviour of the fiberglass mesh fabric in the real world strongly alkaline environment of stuccos/renderings or other cement mixes.
The remaining tensile strength should be at least the 50% of the initial.
Different norms prescribe the minimum remaining tensile strength a mesh should have depending on its end use.
8. Kind of weave: For most alkali resistant fiberglass mesh fabrics a type of a leno weave is used. Leno weave is used to improve the stability of fabrics with low fiber count.
According this weave type, two adjacent warp yarns are twisted around the weft yarns and lock them securely to form a stable grid.
9. Material Linear Density: It is calculated for both the weft and warp directions and is expressed in TEX units.
When we say that a yarn is TEX 200, we mean that 1000 linear meters of this yarn weigh 200gr.
If we say that a yarn is TEX 200 x 2, this should imply a two ply yarn.
Higher Material Linear Density means a stronger yarn, with a higher tensile strength.
10. Many alkali resistant fiberglass mesh fabrics are coloured with different colors. This happens during the procedure that renders the yarns alkali resistant. A special dye is added in the solution used to treat the fabric.
Colors are of course only for aesthetical reasons.
11. Alkali resistant fiberglass mesh fabrics gradually replace metal lathing in the majority of their applications. For a comparison between the two products, please check the folloing article on articlesbase:
ALKALI RESISTANT FIBERGLASS MESH FABRICS VS METAL LATHING
12. Most manufacturers recommend the placement of meshes somewhere in the middle third of the stucco/plaster thickness.
In this region, the nearer the mesh to the substrate, the better.
13. There is no need for mechanical fixing. The mesh is layed between two successive layers of the cement mix. A minimum overlap of 10cm between two adjacent layers of the mesh is indispensable.
Utmost care should be taken to avoid blister and crease formation. The mesh fabric is pressed gently from the top to the bottom in the fresh plaster.
14. Main uses of alkali resistant fiberglass mesh fabrics:
They are used to reinforce plasters/stuccos and prevent cracking in cases such as:
* EIFS or ETICS
* above insulation materials
* above wire channels
* diagonally above doors and windows
* joints between heterogenous materials
* screeds over sound insulation materials of floor heating systems.
Finally they are used to increase the impact resistance of rendering in public building.
Chris Strogilis
Civ. Eng. – MBA – DipM
http://maconwaterproofing.blogspot.com
About the Author
Civil engineer with postgraduate studies in MBA and Marketing
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