Mapetherm AR1 GG is a grey or white powder made from cement, selected sand, synthetic resin and special additives with a fine grain size of up to 0.6 mm, developed according to a formula developed in MAPEI’s own research laboratories. Used as a binder and reinforcement for thermal-insulating panels and thermal insulation systems.

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• Features & Benefits
• Substrate Preparation
• Mix Preparation
• Application as adhesive
• Application as a smoothing & levelling compound
• Cleaning
• Limitations

Features & Benefits

When mixed with water, Mapetherm AR1 GG forms a mortar with the following characteristics:

• Low viscosity and, therefore, good workability
• High thixotropic consistency: May be applied on vertical surfaces without running and without the risk of insulating panels slipping, including large sized panels
• Bonds perfectly to all materials normally used in the building industry
• Hardens without shrinking

Substrate Preparation

The substrate must be sound, strong and free of dust, loose parts, grease, oil, adhesive etc. It is recommended to use Nivoplan or Mapewall GPR to even out variations in masonry or cementitious substrates.

Gypsum substrates must be perfectly dry, free of dust and treated with Primer G before bonding insulation panels.

Mix Preparation

Pour the Mapetherm AR1 GG while mixing in a container with 20-24% by weight of clean water (approx. 5.0-6.0 litres of water per 25 kg of powder). Stir the mix, preferably with a low-speed mixer to avoid drawing in air, until a smooth, creamy, lump-free paste is obtained.

Let the mix stand for 5 minutes, and stir again briefly before use. The mix obtained remains workable for approximately 3 hours.

Application as adhesive

Spread Mapetherm AR1 GG directly on to the back of the panels, in an even layer, using a 10 mm notched trowel when the substrate is flat, or with a minimum coverage of at least 40% using a perimeter band, with additional central dabs, if the substrate is uneven.

After applying, press the panels down well to guarantee a secure bond to the substrate and check the flatness with a straightedge.

Application as a smoothing & levelling compound

Once the adhesive is completely dry, at least 24 hrs after fitting the panels, install specified Mapetherm fixings, before spreading an even layer of Mapetherm AR1 GG on the surface and then embed Mapetherm Net alkali-resistant glass fibre mesh in the mortar.

The Mapetherm Net must be pressed down with a smooth trowel on the fresh layer of mortar, and must overlap by at least 10 cm along the joints.

After 12-24 hours, apply a second layer of Mapetherm AR1 GG smoothing and levelling compound to form a compact, even surface suitable for the final coating which must only be applied once the smoothing layer is hardened and cured.

Cleaning

Tools and containers may be cleaned with water while Mapetherm AR1 GG is still fresh.

Limitations

• Do not use Mapetherm AR1 GG to bond insulating panels on metallic surfaces or substrates subject to large movements
• Do not use if the panels have a smooth surface, good bonding may be impeded: polyurethane or mineral fibres with a surface coating of kraft paper, extruded polystyrene with a surface skin, etc