Make sure that the concrete backing for applying the plaster system is made of structural concrete with a strength suitable for the application. Take care that the concrete is strong and dry (humidity below 2%) and clear of dust, oils, paint, cement water, mortar, plaster and so forth. Make sure that there are no loose bits, blemishes, impurities, grease, or anything else liable to impair the adhesion of the system. Plastering operations may be proceeded with no less than 28 days after the completion of the concrete casting work. Plaster is not to be applied when the temperature is below 5°C or above 35°C. The compressive strength of the base should be at least 30 MPa and the pull-off strength shall be at least     1 MPa. 

If reinforcement irons protrude, they should be protected against corrosion and treated in accordance with the special concrete renewal specification using BG Armoseal 340 combined with BG Repaircrete 305. To renew the concrete, remove weakened layers, protrusions and foreign bodies and cut off  exposed ends of tie/iron wires. Clean oil, dust, grease and salts off the surface. Fill segregations, holes and gaps in the concrete with BG Repaircrete 305 and install angle and metal corner pieces around the perimeter of the buildings and openings. Make sure areas intended for plastering are properly levelled and conform to the planned outline. 

Before proceeding with application, thoroughly rinse the base and make sure that the backing wall has been moistened. Start application when the base is damp but not moist.

Use BG Repaircrete 305 - a cement mortar with a high final strength for concrete repair and renewal supplied in 25 kg. bags. To prepare the mixture pour 3.75 l. of clean water into a clean vessel and slowly add the entire contents of the bag. Stir the mixture for 5 minutes using an electric stirrer with a special spiral arm for bonding mixes until a lump-free uniform mixture is obtained. Following the initial stirring operation, wait about 3 min. and stir again for 2 min. 

Firmly press the mixture on to the concrete surface and smooth with a plastering trowel. If a layer thicker than 20 mm. needs to be built up, wait at least two hours between layers. 

If exposed iron is present, the concrete surrounding the iron bar is to be carved out to a depth of at least 10 cm. behind the bar. Remove any dust, grease, or loose bits from the bars and remove rust by mechanical means or sand spray until a clean iron surface is obtained. Spread 2 layers of BG Armoseal 340 over the steel reinforcement bars. Allow to dry and apply BG Repaircrete 305 to fully cover the reinforcement bars. 

Use BG cementitious base plaster for rigid claddings and plaster systems in ordinary and marine environments, supplied in 25 kg. bags. To prepare the mixture pour about 5.5 l. of clean water into a clean vessel for a 25 kg. bag or 8.5 l. of water for a 40 kg. bag, and slowly add the entire contents of the bag. Stir the mixture for 5 minutes using an electric stirrer with a special spiral arm for bonding mixes until a lump-free uniform mixture is obtained. Following the initial stirring operation, wait about 3 min. and stir again for 2 min. To obtain the desired workability up to 2% of water may be added. 

Before proceeding with machine application, make sure that the filling compartment of the machine is free of remnants of other types of plaster. Fill the compartment with BG base plaster, adjust the quantity of water in the machine as desired and start spraying. Before starting to apply the scratch layer, make sure 24 hours have elapsed since completion of the base preparation.

Levelling bars and corner pieces shall only be mounted using a cementitious mixture. Moisten and rinse well until the water is absorbed in the base. Spray or spread a thin layer over the base and press on with the smooth side of the plasterer’s trowel. Complete immediately with an additional layer until the required thickness is obtained. When spreading press the plaster well on to the base and then comb with a toothed trowel. Application thickness: 5 - 7 mm. The thermal plaster shall be applied over the scratch layer 72 hours after the scratch plaster has been applied and cured. If fibreglass meshes are used as required under SI 1920 Part 2, they are to be embedded in the scratch layer. 

On the day following completion of the plastering, curing is to be started by moistening the plaster layer for three continuous days, at least three times a day. In areas where the plaster dries quickly, curing is to be started on the same day. 

Use BG 400 thermal insulation plaster, supplied in 23 kg. bags. To prepare the mixture pour about 13 - 14 l. of clean water into a clean vessel and slowly add the entire contents of the bag. Stir the mixture for 5 minutes using an electric stirrer with a special spiral arm for bonding mixes until a lump-free uniform mixture is obtained. Following the initial stirring operation, wait about 3 min. and stir again for 2 min. To obtain the desired workability up to 2% of water may be added. 

Before proceeding with machine application, make sure that the filling compartment of the machine is free of remnants of other types of plaster. Fill the compartment with BG 400 thermal insulation plaster, adjust the quantity of water in the machine as desired and start spraying. Before starting to apply the thermal plaster, inspect the scratch layer and if necessary repair cracks wider than 0.5 mm. Allow the scratch layer to dry for 24 hours but no more than 72 hours from the time of its completion. Rinse the base well and make sure that the backing wall has been moistened before starting the application. 

Spray or spread, with the smooth side of the plasterer’s trowel, a thin layer compressed to a thickness of 5 mm. over the base to which BG scratch plaster has been applied . Complete immediately with additional layers until the required thickness is obtained. Levelling and smoothing shall be carried out with an h-section metal bar and a metal plasterer’s trowel. The thickness of the layer to be applied is 20 - 55 mm., and shall be determined based on the thermal resistance requirements set out in Standards 5075, 1045 and 1414.

On the day following completion of the plastering, curing is to be started by moistening the plaster layer.  for three continuous days, at least three times a day. In areas where the plaster dries quickly, curing is to be started on the same day. 

Use BG 407 mamad gypsum plaster, supplied in 25 kg. bags. The gypsum plaster layer shall be applied at least a week after completing the application of the cementitious thermal layer, to the final height of the skirting. Skirting tiles are not to be laid on gypsum plaster. 

To prepare the mixture pour 15 - 16 l.  of clean water into a clean vessel and slowly add the entire contents of the bag. Stir the mixture for 5 minutes using an electric stirrer with a special spiral arm for bonding mixes until a lump-free uniform mixture is obtained. Following the initial stirring operation, wait about 3 min. and stir again for 2 min. To obtain the desired workability up to 2% of water may be added. The plaster shall be applied using a plasterer’s trowel, and smoothing may be carried out with a metal trowel.  

Before proceeding with machine application, make sure that the filling compartment of the machine is free of remnants of other types of plaster. Fill the compartment with BG 407 gypsum plaster, adjust the quantity of water in the machine as desired and start spraying. 

After filling the wall between the angle pieces, levelling and smoothing may be carried out with an h-section aluminium bar. Voids are to be filled or excess material removed until a level, uniformly thick layer is obtained. Following initial setting and drying after the moment of application, the filling layer is to be scraped using a suitable scraping bar. The final drying process of the scraped filling layer will take 1 - 3 days (depending on weather conditions). The levelled layer is 4 - 6 mm. thick. 

To apply the finishing layer, use a metal trowel to spread a single 1 - 2 mm. smoothing layer of gypsum plaster, followed immediately by embedding a reinforcement mesh and making sure it is not exposed after the plaster surface has been processed. Wait for the initial drying and rub the plaster with a wet sponge in a circular motion. Immediately on completion of the rubbing the plaster is to be smoothed using a metal trowel until a flat surface is obtained. Thickness of smoothing layer: 1 - 2 mm.

The reinforcement mesh shall be of a flexible type made of alkali-resistant fibreglass with a hole size of 2.8X2.8 mm. The mesh shall cover the entire wall and shall be continuous up the whole height of the plastered wall. 

Adjacent strips of reinforcement mesh shall overlap by at least 100 mm. Make sure that the mesh is not exposed following processing of the plaster surface.

The following inspections shall be performed in all cases: Perpendicularity and flatness of plaster, adhesion of plaster system and thickness of layers. The plastered areas shall be inspected as specified in SI 1820 Part 2, SI 1414 Part 1 and SI 5075.

The overall thickness of all layers of the plaster system shall not exceed 70 mm. on the walls. The  thickness of the layers covering the mesh shall not exceed 2 mm.

The minimum pull-off adhesive strength of the backing shall be 1 MPa.
The minimum pull-off adhesive strength of the system in a single test shall be 0.15 MPa.
The average pull-off adhesive strength of the system shall be 0.20 MPa.
The permitted measurement deviation shall be 0.01 MPa.

The completed plaster system shall meet the requirements of SI 3970 and SI 5075. 

The structure and thickness of the layers of the system shall be as follows:
n the case of plaster whose thickness does not exceed 7 mm. no reinforcement mesh is required; a reinforcement mesh must be provided for plaster with a thickness exceeding 7 mm.
The overall thickness of the gypsum plaster layer for walls without thermal plaster shall not exceed 20 mm., and for ceilings the layer thickness shall not exceed 7 mm.
The thickness of layers covering the mesh shall not exceed 2 mm.

A total of 3 layers is required:

1. Bridging layer - BG scratch for gypsum plaster.
2. Levelling layer - BG 407 gypsum plaster for mamads, 5 - 19 mm. thick.
3. Finishing layer - BG 407 gypsum plaster for mamads, applied in a single layer:
   
   
   • First layer - 1 mm. thick.
   • A reinforcement mesh shall be embedded while the layer is still fresh.
   • A second 1 mm. layer shall be applied while the layer is still fresh.

*Care is to be taken not to allow exposure of the mesh following processing of the plaster surface.

The following inspections shall be performed in all cases: Perpendicularity and flatness of plaster, adhesion of plaster system and thickness of layers. The gypsum plaster shall be inspected as specified in SI 3970, SI 1414 Part 1 and SI 5075.

The overall thickness of all layers of the plaster system shall not exceed 20 mm. on the walls and 7 mm. on the ceilings. The  thickness of the layers covering the mesh shall not exceed 2 mm.

The minimum pull-off adhesive strength of the backing shall be 1 MPa.
The minimum pull-off adhesive strength of the system in a single test shall be 0.15 MPa.
The average pull-off adhesive strength of the system shall be at least 0.40 MPa.
The permitted measurement deviation shall be 0.01 MPa.

• The Company’s Warranty is limited only to the nature and quality of the products, not applying to the manner of their employment or substituting for the installer’s responsibility.
• The installer is required to check the suitability of the product for the required application.
• This specification sets out general points of emphasis and requirements for the employment of products used to seal a protected space with as well as without a thermal insulation requirement - to the requirements of SI 1920 Part 2 for plaster, SI 3970 for gypsum plaster, SI 1414 Part 1 for a building thermal insulation system, and SI 5075 - Coating and Cladding System in Protected Spaces. 
• The thickness and type of thermal plaster shall be determined in accordance with the requirements of the relevant Standard - 1045 - and/or a thermal consultant. 
• This specification is no substitute for a work specification provided by a designer or consultant.
• We reserve the right to update or modify the data and recommendations without prior notice.
• In all events, this document shall not be such as to approve or recommend any deviation or exception from the regulations and laws of the State of Israel, especially the Planning and Development Law, 5725-1965 and Standards issued by the Standards Institute of Israel. 
• Likewise, this document is no substitute for inspection under the aforesaid Law and Regulations, nor does it constitute a reference for them.

• Relevant Standards - 1920 for plaster; 1414 Part 2 for thermal insulation; 1045 for thermal insulation; 5075 for protected space coatings system, SI 3970 for gypsum plaster.
• The thermal plaster shall be selected and the work performed as per the requirements of SI 1920 Part 2 and SI 1414 Part 1.
• The products referred to in this specification shall be stored in a shaded and ventilated area protected from sun and rain.
• When manually applying gypsum plaster the material is to be used up to 30 min. following its preparation.
• Clarification: the lower the rating of the thermal plaster, the higher its thermal insulation.
• Gypsum plaster is to be applied above the final top level of the skirting.
• A water hose is not to be used before or in the course of smoothing operations.
• Do not abrade the wall surface with sandpaper.
• Preparation of a full bag of thermal plaster is mandatory.
• The thermal plaster contains polystyrene flakes and should be shielded from wind during preparation.
• The BG Bond Ltd. Technical Department should be consulted before each application.
• Reinforcements and finishing details shall comply with a special specification and the appropriate Standard requirements.
• Fibreglass meshes shall be provided as part of the plaster system to the requirements of SI 1920 Part 2 and SI 5075.
• It is mandatory to allow each layer to dry before proceeding with the next layer. The layer must be hard and dry through its entire thickness, not just its external surface, since covering a half fresh layer with a new layer above it will prevent the material from setting and impair the system.
• Work is to be carried out in accordance with the provisions of the relevant Israeli Standard.
• On completion of the work and at each stage as required, testing is to be performed to the relevant Standards and by means of a certified laboratory.    
• Water/polymer is not to be added to the mixture after it dries, and a dried mixture is not to be used.
• On completion of the work, wash hands and tools under running water.
• Skin and eyes are to be protected, avoiding direct contact with materials. In the event of contact, wash immediately under running water.
• The materials are inedible and should be kept out of the reach of children.
• For additional safety information, contact BG Bond Ltd. to receive an SDS Safety Sheet.