• This specification outlines general guidelines and requirements for the use of products in plastering and natural stone cladding using the adhesive method combined with mechanical anchoring, in accordance with the requirements of Israeli Standard (IS) 2378 Part 4 for cladding and IS 1920 Part 2 for plastering.
• The work method, as well as the selection of plaster, adhesive, screws, and cladding stone, must comply with the requirements of IS 1920 Part 2 and IS 2378 Parts 1 and 4.
• This specification does not serve as a substitute for a detailed work specification prepared by a planner or consultant, nor does it replace the need for engineering design of the system as required by IS 2378 Part 4.

Make sure that the concrete backing for applying the waterproofing system is made of structural concrete with a strength suitable for the application. Waterproofing 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, high winds are blowing, it is raining, or hamsin conditions prevail. In all events, a sunshade should be put up over the work area.

Take care that the concrete is strong without loose bits, blemishes, impurities, oil, or anything else liable to impair the adhesion of the system. If reinforcement irons protrude, they should be protected against corrosion and treated in accordance with the special concrete renewal specification. 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 and install angle and metal corner pieces around the perimeter of the building 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.

For special types of backings such as the mamad window or roll-up shutter pocket wall, the method for mounting the cladding shall be based on an engineering calculation as set out in SI 2378 Part 3 or 5. For adhesion to thermal insulation on thermal bridges, a steel reinforcement mesh shall be embedded in the levelling layer of the plaster, anchored to the backing, as required under SI 1920 Part 2.

Use BG Repaircrete 305 - a cement mortar with a high final strength for concrete repair and renewal supplied in 25 kg. bags. 

Material Preperation:
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. 

Material Application:
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 510 cementitious base plaster for rigid claddings and plaster systems in ordinary and marine environments, supplied in 25 kg. bags. 

Material Preperation:
To prepare the mixture pour about 5.5 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. 

Material Application:
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 scratch 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 the 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 levelling plaster shall be applied over the scratch layer 24 hours after the scratch plaster has been applied. Insofar as waiting is not possible, curing and application are to be effected within 5 days of completion of the scratch layer. 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 520 cementitious levelling plaster for rigid claddings in ordinary and marine environments, supplied in 40 kg. bags. 

Material Preperation:
To prepare the mixture pour 8 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. 

Material Application:
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 levelling plaster, adjust the quantity of water in the machine as desired and start spraying. Before starting to apply the levelling layer, check the scratch layer and if necessary repair cracks wider than 0.5 mm.

Spray or spread with the smooth side of the plasterer’s trowel a thin and compressed 5 mm. thick layer  of BG scratch plaster over the plastered base. Complete immediately with additional layers until the required thickness is obtained. Levelling and smoothing shall be carried out using a metal h-section bar and metal trowel. Before final drying, the plaster should be smoothed with a scraping bar. 

Thickness of layer to be applied: 8 - 20 cm. In the case of exterior plaster, the thickness of the levelling layer shall not be less than 8 mm. at any point and the total thickness of all the layers shall be not less than 12 mm. If a greater thickness is required for levelling, steel meshes are to be used as required under SI 1920 Part 2. 

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.

To special requirement, the system watertightness of the exterior plaster only is to be tested as specified in the section of SI 1476 Part 2 dealing with watertightness testing of walls. The test is to be carried out following completion of the plastering work. Should sealing be required, a flexible cementitious seal in two layers shall be provided using BG Flexseal 160 or BG Readytop 701 over the levelling plaster layer.   

Before starting the cladding work, as well as during its progress and on its completion, tests shall be conducted by a certified laboratory. 28 days after completion of the cement plaster system finish, a pull-out test shall be conducted by a certified laboratory to determine the type of adhesive. The results of the test required for selecting the adhesive shall comply with SI 2378 Part 4.

One of two types of adhesive may here be used: for base and backing pull-out adhesive strength in the range of 0.5 - 0.7 MPa, BG 2121 C2TES2 is to be used; for over 0.7 MPa, BG 63 C2TES1 should be used.

Use BG grout for filling regular seams between adjacent stones, supplied in 25 kg. bags.

The infrastructure should be prepared in advance - thoroughly clean from inside the joint, the front and sides of the tiles, traces of concrete, loose bits, fats, grease and anything else liable to impair adhesion.

Material Preperation:
To prepare the mixture, pour 5 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.  

Material Application: 
Before applying the material, moisten the joint surfaces with a damp sponge. Each joint should be filled using a grout gun, a grouting trowel, or any other suitable tool. Grout residues should be cleaned of the area while the material is still fresh. Final clean-up shall be performed after drying for about an hour. Application thickness in joints: 10 - 25 mm.  

Use BG PU40, a single-component polyurethane mastic for filling structural expansion joints in both directions. supplied in sausage form. A horizontal intermediate joint shall be provided on each floor of the structure. The distance between vertical joints shall not exceed 10 mm. Wherever different surfaces or materials meet, a separating expansion interface joint shall be provided. The width of the joint shall be at least 10 mm.

The application base has to be level and dry, and clear of dust, oils, loose bits, paint, cement water and the like. Grease is to be cleaned off using standard industrial solvents such as standard mineral turpentine or alcohol. On absorbent bases such as concrete and stone, type PK-1 primer is to be applied in accordance with the primer application directions. When the back of the seam is provided with a backup profile, one made of HDPE is to be used.  

Material Application:

Cut off the end of the sausage and insert it into the sausage gun. Cut off the end of the nozzle at a 45° angle and apply the mastic in a full and continuous layer. The mastic may be smoothed with soap and water immediately following application or using a special tool. The base and equipment should be cleaned while the material is still fresh using standard mineral turpentine. The mastic may be used up to 24 hours after being opened, as long as the sausage has not been exposed to the air. This material is used to fill seams that are 10 - 25 mm. wide. Mechanical mounting shall be carried out as directed in SI 2378 Part 4. 

Use BG Super Hybrid, a single-component material based on Ultra-Clear technology for sealing and bonding stone studs of a type identical to that used for the stone in the walls. The entire bore void is to be filled and the stud inserted until the material oozes out around the stud. Take care to clean the surrounding area immediately.  

• 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.
• 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.

• Natural stone - as defined in SI 2378 Parts 1 and 4; the thickness of the stone shall not be less than 20 mm. or more than 30 mm.
• The area of the stone shall not be more than 0.25 sq.m. and it shall not have a bonding mesh attached to its back.
• Relevant Standards - 1920 for plaster Part 2; 2378 for cladding; 1661 for regular joints; 4004 for adhesives; 1536 for sealing; 1476 for seal testing; 1555 for exterior cladding.
• Before using a product listed in this specification, the technical sheet should be consulted and adhered to.
• The work shall comply with the provisions of the relevant Israeli Standard.
• A fibreglass mesh is to be applied around openings and at vertical and horizontal seams between concrete and blocks, as required under SI 1920.
• The work shall comply with the provisions of the relevant Israeli Standard.
• 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.
• 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.    
• Following completion of the cladding work, the area is not to be exposed to rain or rinsed for 72 hours after completing the application.  
• Care is to be taken that the adhesive layer does not interfere with application of the grout and the polyurethane mastic.
• Leave the seams open until the tile adhesive has fully dried.
• Water/polymer is not to be added to the mixture after it dries, and a dried mixture is not to be used.
• Tiles not complying with the requirements of SI 2378 Part 1 are not to be laid.
• 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 safety information, contact BG Bond Ltd. to receive an SDS Safety Sheet.