Academy for Radiation Protection and Environmental Medicine|

Shielding mesh GPA

Shielding mesh GPA 2020-07-02T10:28:30+10:00

GPA shielding mesh provides effective protection against electronic pollution

GPA is a fibreglass mesh with metal woven through it that is coated in Geovital’s electrically conductive T98 Alpha shielding paint.

GPA reduces electromagnetic high frequency (RF) radiation exposure in buildings from common sources like mobile phone towers, wi-fi, smart meters, cordless phones, radar, airport navigation systems, etc. It can also be used to shield against low frequency electric fields, often produced by internal wiring.

GPA can be applied on walls, ceilings and potentially, flooring:

  • under timber cladding
  • placed inside wall, ceiling and floor structures
  • placed under carpet
  • as reinforcement mesh in ETIC systems
  • as reinforcement mesh in rendering

GPA provides effective shielding against electronic pollution. It can achieve a reduction of over 99% in the amount of high frequency (RF) radiation and reduces low frequency electric fields dramatically (See test report: University of German Armed Forces). As well as being alkali resistant, it has a high tensile strength.


IMPORTANT: GPA Mesh must be grounded!

In accordance with current EU legislation, Geovital advises that surfaces must be grounded by a qualified electrician. This may also be an insurance requirement.

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  • low frequency (LF) and high Frequency (HF) shielding
  • internal and external application
  • as reinforcement mesh in ETIC systems
  • as reinforcement mesh in rendering
  • under timber cladding
  • placed inside wall, ceiling and floor structures
  • placed under carpet
  • For safety reasons, all surfaces must be grounded on the ground wire of the electrical system or by contact on a stripped section of central heating pipe (EU regulation) by a qualified electrician. We strongly recommend a ‘grounding strip’ (metal strapping) for this purpose.

For application within the roof or behind timber or plasterboard coverings, GPA can be stapled into place. Adjacent strips must overlap. And if the fabric is cut to make openings for scaffolding anchors, the opening will have to be covered by an additional GPA mesh strip/panel.

The application of GPA in rendering is identical to that of a conventional reinforcement mesh for external rendering. GPA mesh must be pressed into the fresh reinforcement compound without bubbles or wrinkles and then smoothed over with filler.

The grounding cable or metal strapping is put in place in preparation for a qualified electrician to connect it to ground.

Technical details

  • surface weight VIAS 003 (internal) >180 g/m²
  • mesh size VIAS 001 (internal) 5×5 mm
  • tensile strength in delivered condition EN ISO 13934-1 > 1750 N/50 mm
  • tensile strength after 28 days storage in 5% NaOH EN ISO 13934-1 > 850 N/50 mm
  • tensile strength after storage for 6 hrs at 80° C in solution with pH 12.5 EN ISO 13934-1 > 750 N/50 mm
    including stainless steel threads and special conductive coating weft to weft x warp to warp and subsequent wetting/drying.
  • mesh size 4 to 5mm
  • foldable and bendable
  • usable as reinforcing mesh in rendering or concrete
  • colours: graphite grey /black

Shipping and packaging

  • roll: (50 m x 1 m) (excluding grounding wire or strapping)
  • per linear meter, 1 m wide (excluding grounding wire or strapping)

Recommended accessories
metal strapping for grounding


Guide: An example of proper application of GPA in rendering

Test report on shielding effectiveness by the University of the German Armed Forces, Munich