Waterproofing

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Waterproofing Singapore

 

Waterproofing any building or infrastructure is a broad capability that can involve a large range of products and methodologies. Nearly every building asset requires some form of waterproofing system to prevent water ingress or escape. Waterproofing can involve structural engineered injection solutions, liquid applied membranes, torch-on membranes, adhesive applied membranes, or a combination of all. Waterproofing can be performed on the smallest planter box to large expansive building roof tops and balconies to the waterproofing of basements and car parks and underground infrastructure.

Waterproofing is an integral part of a building structure, be it for residential, commercial or industrial purposes. Good waterproofing prevents water leakage and seepage in the long run. It will also save you money, time and inconveniences when waterproofing is done right the first time.

LE FONG IS AN EXPERIENCED COMPANY IN WATERPROOFING BUILDINGS AND STRUCTURES.

What are some of the waterproofing techniques that we use?

There are many ways to waterproof a building. The method used for the various areas depends on the needs and uses of the place. Here are some of the techniques that Le Fong uses.

Torch-applied Membrane

 

  

The torch-applied membrane is a type of waterproofing technique in which the membrane is torched-on using a particular kind of material called a distilled bitumen compound. It is an economical way to waterproof as it is durable and able to withstand both high and low temperatures as well as fluctuations in temperatures. The torch-applied membrane is also strengthened with polyester which prevents wrinkling during the application.

Usage of a Torch-applied Membrane

The torch-applied membrane can be applied to almost any kind of surface.

Benefits of a Torch-applied Membrane

There are many benefits of a torch-applied membrane:

  • Resistance to algae and dirty mould
  • Resistance to deterioration and tear
  • Resistance to extreme weathers and temperature fluctuations
  • Low flammability
  • Ability to coat with a heat-dispersible finish
  • Not easily damaged
  • UV resistance

Liquid-applied Membrane

  

 

The liquid-applied membrane is a type of waterproofing technique in which a coat of cold-applied solvent-based material is coated onto concrete surfaces. It is useful for both waterproofing and damp-proofing of a concrete structure, masonry or block. It also works as an abrasion protection coating for other surfaces. It can be applied either vertically or horizontally.

Usage of the Liquid-applied membrane

The liquid-applied membrane is useful for waterproofing and damp-proofing the following:

  • Basement walls and floor slabs
  • Plaster boxes, patios and balconies
  • Tunnels and foundation walls
  • Inspection pits, bathrooms and carparks

Benefits of the Liquid-applied membrane

The benefits of the liquid-applied membrane are numerous. Here are some of them.

  • Flexible and Crack Resistant
  • Resistance to aggressive soil conditions
  • Tar-free
  • Easy to apply; can be cold-applied directly using a brush, roller, squeegee or trowel
  • Moisture-cured
  • Tough and seamless
  • Protects against contaminated groundwater

Cementitious Brush-applied Coating

  

 

The cementitious brush-applied coating is a kind of waterproofing material that is suitable for all masonry structure and surfaces in contact with drinking water. It is a practical and permanent waterproofing solution to concrete structures.

Usage of Cementitious brush-applied coating

The cementitious brush-applied coating is suitable for almost all surfaces, but it is excellent when used on a surface of water-retaining structures and planter boxes.

Benefits of Cementitious brush-applied coating

The benefits of the cementitious brush-applied coating are many.

  • Flexible coating that adheres to most surfaces
  • Covers hairline cracks of 2.0mm or lesser
  • Resistance to wear
  • Resistance to weather and temperature fluctuations
  • Resistance to abrasion
  • Resistance to frost and thawing salts
  • Contains no chlorine and salts that cause corrosion
  • Non-pollutant – does not affect drinking water

Self-adhesive Membrane

  

 

The self-adhesive membrane is specially formulated to make it easy for installation. The membrane can be easily adjusted to its best position before the adhesiveness takes effect. The strong adhesion only takes place after a few minutes after the membrane is laid in place. No open flame is needed for installation.

Usage of Self-adhesive Membrane

The self-adhesive membrane is very useful in the following:

  • Restricted areas and flammable spaces
  • Irregularly-shaped surfaces
  • Pollutant-prone areas

Benefits of Self-adhesive Membrane

The self-adhesive membrane has essential benefits for restricted areas.

  • Easy installation without open flames
  • Highly resistant to acids, alkalis and other pollutants
  • Adapts to irregular shape surfaces
  • Ability to stretch up to 9% without breaking or cracking
  • Self-seal on contact to maintain water tightness
  • Constant thickness to provide a consistent protection for the waterproof area

Traffic-bearing Membrane

  

 

Traffic-bearing membrane is a kind of waterproofing material used to protect exposed concrete walls that are subjected to the weather. It forms a coating on an exposed concrete surface. A traffic-bearing membrane typically consists of a two-layer system: a base coat that acts as a protective barrier and a top layer that protects against traffic wear and tear.

Usage of Traffic-bearing Membrane

The traffic-bearing membrane is an UV-resistance waterproofing material. It is used on:

  • Rooftops
  • Walls
  • Garages
  • Carparks

Benefits of Traffic-bearing Membrane

Here are the benefits of the traffic-bearing membrane:

  • Resistant to extreme weather
  • Resistant to weather fluctuation
  • Resistant to traffic wear and tear
  • Resistant to UV rays

PVC Membrane

  

 

The PVC membrane is a superior high-quality PVC waterproofing membrane that is highly recommended for roofs and decks. It is suitable for both exposed and concealed roofs. The PVC membrane is strictly controlled during production, resulting in an excellent material with a high track record.

Usage of PVC Membrane

The PVC Membrane is a flexible waterproofing material that is adaptable to an irregular shape. It is compatible with standard roof material and can be applied directly. Some of the uses for PVC membrane include:

  • Exposed roofs
  • Concealed roofs
  • Standard Decks
  • Roof Gardens
  • Walkways
  • Driveways

Benefits of PVC Membrane

The PVC membrane has many benefits due to its stable, yet light-weight properties. Here are more benefits.

  • Homogeneous, soft and flexible
  • Adaptable to many types of surfaces
  • Available in light coloured, smooth surface that promotes heat reflection
  • Resistant to radiation
  • Resistant to fire, sparks and radiant heat
  • Resistant to general chemical environmental impact
  • Resistant to root and rhizome penetration (hence suitable for roof gardens)
  • Allow moisture to escape from the surface of the membrane
  • Quick and easy to install
  • Can be recycled
  • Durable
  • Safe and Reliable
  • Cost-effective

Installation of Waterproofing System onto existing flat roof and replacement of rainwater goods

Scope

The works specified within this section is intended to address water seepage problem at existing flat roof of Drum Tower located within Kong Meng San Phor Kark See Monastery, 88 Bright Hill Road, Singapore. The herein work call for the installation of new waterproofing membrane system (complying to the requirement stipulated herein and to be proposed by Contractor) over existing flat roof and replacement of existing rainwater goods serving the existing flat roof. The works specified herein shall consist of all materials, equipment and labour necessary for the temporary relocation of all existing items sitting on existing flat roof to accommodate this herein intended waterproofing work, cleaning and preparation of existing roof to receive new waterproofing membrane system, exposing clean and prepare existing vertical substrates to receive new waterproofing system, crack repair (grouting) and painting (min 2 coats of emulsion paint) at underside of existing roof slab at ceiling of corridor of level below flat roof, remove and replace existing rainwater goods, and related works as per waterproofing system manufacturer’s recommendation to ensure that the waterproofing system is fit for its purpose and the performance specification is strictly complied with.

Quality Assurance

The performance of the works covered in this trade shall be undertaken by a waterproofing manufacturer approved specialist firm agreed by the Employer hereinafter shall be referred to as the Contractor.

The term ‘Contractor used in this specification shall mean a firm of established reputation, which is regularly engaged in, and which maintains a regular force of workmen skilled in handling and application of the roof waterproofing system specified.

The Contractor shall submit the following prior to the commencement of the works:

Evidence of being bona fide operative specialising in the installation of the specified materials as endorsed by the approved manufacturer.

Detailed list of at least S similar projects which the firm has completed within the past 3 years; giving the job location, name of owner and architect (if project administered by architect) and dates of commencement and completion of the works.

The Contractor shall ensure that authorised representatives of the manufacturer are provided to enable field supervision of the installation of the complete waterproofing system, monitor the work in progress and submit written evidence of satisfactory work completion.

The Contractor shall be responsible for the performance of the waterproofing system including the replacement rainwater goods.

It shall be the responsibility of the Contractor to inspect the construction site prior to the commencement of the roofing works including checking all existing items sitting on the existing roof which will require temporary relocation to accommodate the proposed work. The Contractor shall take note of site conditions which affect their roofing work such as, but not limited to, access to roof, vehicle access for material delivery and etc.

Submissions

Drawings

The Contractor shall submit applicable manufacturer’s details together with their quotation.

The details shall illustrate the waterproofing installation work intended at interfacing with existing elements at the flat roof such as existing door opening, existing building wall, existing railings/balustrades, new rainwater outlets, etc.

Product Literatures

The Contractor shall provide with their quotation the waterproofing system manufacturer’s technical data and installation literature.

Safety Health Environmental Information

The Contractor shall provide risk assessment, risk matrix table and safe work procedure for Employer’s Safety Officer’s approval at least 1 week prior to commencement of work.

Performance Certification

Upon completion of work, the manufacturer’s authorised representative shall inspect the waterproofing installation and provide certification on compliance with manufacturer’s standards/requirements.

Warranty

The Contractor shall provide a five (5) year warranty for the completed works on its performance against any defects and failure as a waterproofing system in particular to its prevention of water penetration.

WATERPROOFING SYSTEM

Waterproofing Treatment to Existing Roof Surface and Pipe Penetration Areas

The Contractor shall thoroughly clean the existing roof surfaces and seal all cracks and/or openings in the roof slab with non-shrink cementitious mortar or grout.

The Contractor shall rack and proper clean the cracks before sealing the cracks.

The Contractor shall provide 300mm wide waterproofing manufacturer’s recommended polyurethane base liquid applied waterproofing membrane around service pipes. The application of the waterproofing membrane shall be carried up the pipes at a minimum height of 100mm from the new finished flat roof level.

The surface to receive the membrane shall be free from dust and laitance. The application of the membrane shall comply strictly to the recommendations and instructions of the manufacturer or requirements stipulated herein whichever more stringent.

After allowing for adequate curing, lay waterproof cement mortar to form a haunch around the pipes sufficiently to cover the waterproofing membrane. Adequate measures shall be provided to protect the membrane from being damaged. The mortar mix shall be of 1 part cement to 3 parts sand by volume.

The waterproofing membrane shall be provided complete with manufacturer’s recommended adhesive tape and flashing accessories.

Waterproofing Membrane

Before applying the waterproofing membrane system, the entire existing roof surface shall be thoroughly clean, free from dust, etc and in visibly dry condition.

EPDM – Standard Membrane

The waterproofing membrane shall be 1.52mm thick EPDM Ethylene Propylene Diene Terpolymer) Rubberguard non-reinforced membrane (or equivalent) fully bonded and finished with manufacturer’s accessories, e.g. primers, bonding adhesives, lapping tapes, termination bars, formflash, sealants, etc.

Performance Specification

Specific Gravity: ASTM 0-297; 1.15 ± 0.05

Tensile Strength: ASTM D-412; 1305 psi min (9.0 MPa) Factory Seam Strength: ASTM 0-816; Membrane Rupture Elongation: ASTM 0-412; 300%minimum

Tear Resistance: ASTM D-624; 150 lbs/in min. (26.3N/mm) Shore A Durometer: ASTM D-2240; 65 ± 10

Ozone Resistance 7 days/100 pphm at 100 degrees F with 50% extension: ASTM D-1149; No cracks

Heat Aging: ASTM D-573; Tensile min. 28 days at 240 degrees F 1205ps (8.3 MPa) Elongation min. 200%

Brittleness Temperature: ASTM D-746; -49 degrees F (-45 degrees C)

Water Resistance/ Change in Weight after Immersion 7 days at 150 degrees F: ASTM D-471; +8%, -2%

Water Vapour Permeability: ASTM E-96; 2.0 max. perm. mils Tolerance on Nominal Thickness: ASTM D-412; ±10% Weight 0.060 inch sheet: 0.38 Ibisq ft

Alternative materials which are of equivalent performance may be considered by the Employer if Contractor is able to list and provide information to substantiate performance data of alternative material.

Rainwater Goods

Unplasticised polyvinyl chloride rainwater pipes shall comply with BS 4576 Part 1

Rainwater outlets shall be stainless steel grating. Outlets are to have a luting flange and removable raised grating suitable for casting into concrete.

New 50mm overflow spouts shall be provided above each rainwater outlet.

Installation

Preparation at Existing Roof Surface

Surfaces of existing rc roof slab and vertical surfaces to accommodate waterproofing upturns (upon removal of existing finishes at affected vertical areas) shall be properly patched and shall be free of defects or conditions that will interfere with, or prevent, a satisfactory installation of the waterproofing system.

Voids, cracks, holes and other damaged surfaces shall be repaired prior to the laying of the waterproof membrane. Sharp edges shall be cut off or ground down.

Surfaces shall be thoroughly cleaned and free of water, dust, dirt, oil, grease, concrete curing compounds, laitance and other foreign matter. Dirt and dust shall be removed with an air compressor or industrial type vacuum cleaner or methods acceptable to Manufacturer’s representative.

The roof outlet hoppers, drains, upstands, pipes and protrusions shall be verified to be secured in position.

All right angle bends, namely between parapet walls and flat roof slab and similar shall have a mortar cant strip or caving details with an approximately 45 degrees angle which shall be subsequently re-finished to matched existing upon completion of waterproofing installation.

Acceptance of Base Substrate to Receive Waterproofing Membrane

Upon commencement of the waterproofing system, the authorised representatives of the manufacturer shall be deemed to have accepted the base substrate upon which the system is laid and no subsequent claim as to the suitability of the base substrate shall be considered.

On-Site Water Test

Water Test

Upon completion of the waterproofing system, test for watertightness of the installation shall be carried out as follows:

Plug up all rainwater outlets and flood the roof with minimum depth of 50mm of clean water at the lowest point for a period of not less than 48 hours. Provide all temporary kerbs in cement mortar or by other means to provide enclosures to contain the water.

In areas where leaks are observed during the test period, such areas shall be rectified using method acceptable by Employer. Rectified areas shall be retested until such retreated areas pass the water test.

On satisfactory completion of the test, carefully break up and remove any kerb or temporary barrier and remove all debris. The Contractor shall take care in doing so to prevent damage to the waterproofing system or structure.

The water shall be drained off after the test.

Cleaning and Protection

The Contractor shall ensure that all the installation debris are removed daily as the works progress. Upon completion of the works, the Contractor shall not carry out any construction activities on the roof unless protective measures, subject to Employer’s approval, are undertaken by the Contractor.

SPECIFICATIONS:

REPLACEMENT OF EXISTING ROOF WATERPROOFING SYSTEM AND RAINWATER GOODS

Scope

The works specified within this section is intended to address water seepage problem at existing flat roof of Drum Tower located within Kong Meng San Phor Kark See Monastery, 88 Bright Hill Road, Singapore. The work call for the replacement of existing flat roof waterproofing system and existing rainwater goods serving the existing flat roof. The works specified herein shall consist of all materials, equipment and labour necessary for the temporary relocation to area approved by Employer and re-installation of all existing items sitting on existing flat roof to accommodate this herein intended waterproofing work, removal of existing roofing system (including existing waterproofing system) to expose existing roof slab and existing vertical substrates (at areas of existing waterproofing upturns), cleaning and repair of existing roof slab and vertical substrates intended to receive new waterproofing system, make good vertical surfaces to match existing after installation of waterproofing, remove existing rainwater goods, crack repair (grouting) and painting (min 2 coats of emulsion paint) at underside of existing roof slab at ceiling of corridor of level below flat roof, installation of the new waterproofing system, complete with new rainwater goods such as flashings, fascias, tappings, drains, joints, interfacing with the related works, etc. to ensure that the roofing system is fit for its purpose and the performance specification is strictly complied with.

Quality Assurance

The performance of the works covered in this trade shall be undertaken by a waterproofing manufacturer approved specialist firm agreed by the Employer hereinafter shall be referred to as the Contractor.

The term ‘Contractor’ used in this specification shall mean a firm of established reputation, which is regularly engaged in, and which maintains a regular force of workmen skilled in handling and application of the roof waterproofing system specified.

The Contractor shall submit the following prior to the commencement of the works:

Evidence of being bona fide operative specialising in the installation of the specified materials as endorsed by the approved manufacturer.

Detailed list of at least 5 similar projects which the firm has completed within the past 3 years; giving the job location, name of owner and architect (if project administered by architect) and dates of commencement and completion of the works.

The Contractor shall ensure that authorised representatives of the manufacturer are provided to enable field supervision of the installation of the complete waterproofing system, monitor the work in progress and submit written evidence of satisfactory work completion.

The Contractor shall be responsible for the performance of the total system including the waterproofing ancillary items and rainwater goods (ie: flashings, fascias, cappings, drains, joints, interfacing with the related works etc).

It shall be the responsibility of the Contractor to inspect the construction site prior to the commencement of the roofing works including checking all existing items sitting on the existing roof which will require temporary relocation to accommodate the proposed work. The Contractor shall take note of site conditions which affect their roofing work such as, but not limited to, access to roof, vehicle access for material delivery and etc.

SUBMISSIONS

Drawings

The Contractor shall submit drawings incorporating the following information at least 1 week prior to commencement of work:

Installation details for interfacing with existing or new elements at the flat roof such as existing door opening, existing building wall, existing railings/balustrades, new rainwater outlets, etc.

Typical installation details for all systems including but not limited to details at reinforcing flashings, scupper drains, parapets, upstands, termination bar, intersections at horizontal and vertical surfaces, pipe/conduit penetrations, and any other M&E fixings on the roof.

Product Literatures

The Contractor shall provide with their quotation the waterproofing system manufacturer’s technical data, installation literature and performance specification for all materials and systems pertaining to the works.

Safety Health Environmental Information

The Contractor shall provide risk assessment, risk matrix table and safe work procedure for Employer’s Safety Officer’s approval at least 1 week prior to commencement of work.

Performance Certification

Upon completion and testing of the roofing system, the manufacturer’s authorised representative shall inspect the roofing installation and provide certification on the full compliance with the performance specifications.

Warranty

The Contractor shall provide a ten (10) year warranty for the completed works on its performance against any defects and failure as a roofing system in particular to its prevention of water penetration.

 

WATERPROOFING SYSTEM

Waterproofing Treatment to Roof Slab Cracks and Pipe Penetration Areas

The Contractor shall seal all cracks and/or openings in the roof slab with non-shrink cementitious mortar or grout.

The Contractor shall rack and proper clean the cracks before sealing the cracks.

The Contractor shall provide 300mm wide manufacturer’s recommended polyurethane base liquid applied waterproofing membrane around service pipes. The application of the waterproofing membrane shall be carried up the pipes at a minimum height of 100mm from the new finished flat roof level.

The surface to receive the membrane shall be free from dust, laitance and ground smooth if necessary. The application of the membrane shall comply strictly to the recommendations and instructions of the manufacturer or requirements stipulated herein whichever more stringent.

After allowing for adequate curing, lay waterproof cement mortar to form a haunch around the pipes sufficiently to cover the waterproofing membrane. Adequate measures shall be provided to protect the membrane from being damaged during the screeding operation. The mortar mix shall be of 1 part cement to 3 parts sand by volume.

The waterproofing membrane shall be provided complete with adhesive tape and flashing accessories.

Waterproofing Cement/Sand Base and Protection Screed

All parts forming existing waterproofing system shall be thoroughly removed. All roof surfaces to be rendered with the waterproof cement/sand screed shall be brushed clean and well wet before screed is applied. All screed shall be kept damp and adequately cured to prevent shrinkage and cracking.

The screed shall be of one part cement to three parts sand (1:3) by volume, waterproofed with “Sika No.1″, or Fextile 1”; or “Smartguard”; or other approved waterproofing compound and laid to a fall of min 25mm to every 3000mm towards the rainwater outlets, scupper drains or other outlets. Where in the case reinforced concrete roof slab is already laid to fall, the screeding shall be in even thickness. Mixing of waterproofing compound shall be done strictly in accordance with the manufacturer’s printed recommendations or instructions. Screeding thickness shall be a minimum of 20mm thick at the lowest point and laid in a workmanlike manner with even fall and finished smooth with wood trowelling. The cement shall be of a brand currently acceptable for public sector work, be fresh when delivered and used in the order of delivery. Any bag of cement containing partly set cement shall be removed from Site. Cement of different brands shall not be mixed in use. Sand used shall be clean, evenly graded from fine to coarse pit sand, free from learns, silt and other organic matter. Clay sediment shall not exceed 10% by volume.

Waterproofing Membrane

Before applying the waterproofing membrane system, the entire screeded surface shall be thoroughly clean, free from dust, etc and in visibly dry condition.

The Contractor shall use “Shell Flintkote Ultra” waterproofing system or waterproofing membrane system listed in HOB Materials List (Contractor shall attached HDB Materials List and highlight the waterproofing system when submitting the quotation if Contractor propose to use waterproofing system from said list(. The application of the waterproofing system shall fully comply with the Manufacturer’s instructions.

The waterproofing treatment shall be carried up at least 100mm above finished roof slab level at abutments to walls, pipes, parapets, etc.

In the event any exposed surfaces not intended to be waterproofed is stained during the course of the Contractor’s work, the Contractor shall remove such stains and make good to the satisfaction of the Employer at the Contractor’s cost and expense.

Rainwater Goods

Unplasticised polyvinyl chloride rainwater pipes shall comply with BS 4576 Part 1

Rainwater outlets shall be stainless steel grating. Outlets are to have a luting flange and removable raised grating suitable for casting into concrete.

New 50mm overflow spouts shall be provided above each rainwater outlet.

INSTALLATION

Substrate Preparation at Existing RC Roof

Surfaces of existing rc roof slab and vertical surfaces to receive the new waterproofing membrane shall be properly patched and shall be free of defects or conditions that will interfere with, or prevent, a satisfactory installation of the roofing system.

Voids, cracks, holes and other damaged surfaces shall be repaired prior to the laying of the base waterproof cement/sand screed. High spots and/or sharp edges in concrete surfaces shall be cut off or ground down.

Surfaces shall be thoroughly cleaned and free of water, dust, dirt, oil, grease, concrete curing compounds, laitance and other foreign matter. Dirt and dust shall be removed with an air compressor or industrial type vacuum cleaner or methods acceptable to Manufacturer’s representative.

The roof outlet hoppers, drains, upstands, pipes and protrusions shall be verified to be secured in position.

All right angle bends, namely between parapet walls and flat roof slab and similar shall have a mortar cant strip or coving details with an approximately 45 degrees angle.

Acceptance of Base Substrate

Upon commencement of the waterproofing system, the authorised representatives of the manufacturer shall be deemed to have accepted the base substrate upon which the system is laid and no subsequent claim as to the suitability of the base substrate shall be considered.

Thermal Insulation Board (provisional cost)

The Contractor shall indicate provisional cost in his quotation to provide and install insulation boards in the event insulation is found in the build-up of the existing roof waterproofing system. Employer will pay Contractor for the insulation board only if such insulation is installed. If insulation required, the Contractor shall provide 2 layers of 25mm thick multicellular extruded expanded polystyrene (3Skg/ cu. m density; containing flame retardant additive) insulation boards with natural skins on both sides on top of waterproofing membrane and install in accordance to the manufacturer’s method (ie: using manufacturer’s recommended adhesive tapes and ensure that no joints occur).

The insulation boards shall be butted together with no gaps. Gaps between insulation boards are not acceptable. In the case of the 2 layers of insulation boards above the waterproofing membrane, the butt joints between the insulation boards shall be staggered such that the joints are not directly on top of each other.

The insulation boards shall be tapered to rainwater outlets and shall be neatly cut and fitted around the rainwater outlets, roof penetrations and projections.

The insulation boards should be kept dry and protected from the elements. Install only dry insulation boards and only as much insulation boards as can be covered the same day with the waterproofing membrane and completed.

On-Site Water Test

Water Test

Upon completion of the waterproofing system, test for watertightness of the installation shall be carried out as follows:

Plug up all rainwater outlets and flood the roof with minimum depth of 50mm of clean water at the lowest point for a period of not less than 48 hours. Provide all temporary kerbs in cement mortar or by other means to provide enclosures to contain the water.

In areas where leaks are observed during the test period, such areas shall be rectified using method acceptable to Employer. Rectified areas shall be retested until such retreated areas pass the water test.

On satisfactory completion of the test, carefully break up and remove any kerb or temporary barrier and remove all debris. The Contractor shall take care in doing so to prevent damage to the waterproofing system or structure.

The water shall be drained off after the test.

Cleaning and Protection

The Contractor shall ensure that all the installation debris are removed daily as the works progress. Upon completion of the works, the Contractor shall not carry out any construction activities on the roof unless protective measures, subject to Employer’s approval, are undertaken by the Contractor.

Synthetic Resin Dispersion

Improving Mortars and Levelling Compounds for High Loads Increases Elasticity and Walkability Solvent-Free.

It is a milky, pinkish synthetic resin dispersion, when mixed with Floor Levelling Products improves tensile strength for high traffic applications.

Mortar Admix

The diluted additive is used in place of water when mixing sub-floor smoothing and levelling compounds. The Floor Levelling Compound is applied in the usual way, except that diluted 1 part by volume with 2.5 – 5 parts by volume of water is used in lieu of tap water. (The mixing ratio will depend on the end use). The additive produces where necessary, a screed with higher tensile strength, greater elasticity and improves walkability and surface hardness as a result of additional synthetic binding. Applications where the diluted mixes are recommended are as follows:

1. Where higher than normal strength or abrasion resistance is required, i.e. heavy wheeled traffic or castor wheels and other highpoint loadings.

2. Where the screed has to be unavoidably left open or used as a temporary wearing surface before floorcovering is laid.

3. When repairing stair treads.

4. When used as a screed beneath paint and epoxy floor finishes, parquet and rubber flooring.

5. When used in centrally heated buildings and over underfloor heating. Underfloor heating must be turned off 48 hours before screeding so that the sub-floor is cold (normal temperature) before the screed is laid and then left off for 48 hours per 5mm thickness and gradually brought up to operating temperatures. Precautions against rapid drying should still be observed.

6. When levelling rigid timber and metal decking.

7. When levelling over Moisture Barrier with primer for installation of vinyl tile and sheet, carpet and ceramics.

Packaging and Storage

It is supplied in 5 litre containers. Protect from frost and direct sunlight.

Note: The information contained herein is to the best of our knowledge true and accurate. No warranty is implied or given as to its completeness or accuracy in describing the performance or suitability of the product application.

Users are asked to check that the literature in their possession is the latest issue.

 

 

 

It is a special formulated polymerized self-leveling topping for commercial floor areas.

It provides a smooth, flat and level surface that can be installed from 2 mm up to maximum thickness of 10 mm in a single application, it is applied at 3~5 mm normally.

Features / Benefits

  • Cement-based
  • Levelling and smoothing of floor areas
  • High wearing cementitious topping material for residential, commercial floors
  • For thickness of 3 – 5mm in one application, base mix up to 10mm
  • Self-smoothing  Pumpable  Early trafficable

Typical Application:

Use in residential and commercial area. Use on substrates like cement render, concrete, masonry surface, ALC or light-weight board.

Surface Preparation:

The surface must be hard, sound, clean and free of oil, grease, wax, latex compounds and any substance that might act as bond breaker before priming. Use the commercial degreaser to remove polish, wax, grease, oil and similar contaminating substances.

Wetted, frozen or otherwise weak concrete surface must be mechanically cleaned to support applied smoothing compound by short blasting, scarifying and grinding

All cracks in the sub-floor must be repaired to prevent damaging through the overlayment. For deeper pour and large void, mix it with well – washed and dried aggregate of 0.5 – 1.2mm to obtain the desired height.

Priming

Priming is mandatory especially onto very absorbent subfloors such as concrete or cement/sand screeds. Use it to seal the pores, prevent air bubbles and pinholes from rising through the surface of leveling compound and also to promote excellent uniform adhesion to the substrate. With smooth, dense and non-absorbent sub-floors, it may be necessary to use Primer to ensure adequate adhesion of the subsequently applied it. Apply the primer by using a spray or roller. Spread the primer across the substrate and allow it to be dry. Do not install the leveling compound until the primer is thoroughly dry.

Mixing

Pour 1 bag of its powder into 4.75 – 5.25 L of clean water and mixed using a electric drill (min .500rpm) The use of mixing buckets is recommended to reduce the incidence of unmixed powder around the bottom of the bucket.

Always add the correct measured water to a clean mixing bucket first; Its powder should then be added whilst stirring slowly. Mix steadily and thoroughly until it become homogeneous and a lump-free fluid mortar is produced. Continue mixing for another minute until an even consistency is achieved. Do not over use the water.

Application

Pour it onto the primed sub-floor. Use a trowel or spreader to spread the mortar completely. The mixed mortar will be self-smooth within the first 15 – 20 minutes. A 3mm layer of it will be walkable after approximately 3 hours at 30oC ; The time is also reduced where temperature and application thickness are applied to absorbent sub-floors. Apply at temperatures above10 oC.

For areas that require over 10mm thickness, it must be mixed with the following:

Water Powder Dosage Ratio

Sand – 1 part of 2-5mm (by weight)

Water – 10% – 12%

Mix it with 10 % – 12% of water first, followed by adding the sand at a (mixing ratio of 1 part of 2 – 5mm sand by weight) to get the semi –flow mortar.

Drying and Hardening

Foot traffic are allowed after installation in 4~6 hours at 25Ԩ/50%R.H.

Coverage

Approximately 1.5kg of it for powder/m2/mm. The coverage depends on the flatness of the substrate.

Packaging

It is packed in multilayer paper sack incorporating a polyethylene liner- net weight 25kg.

Product Limitation

For internal use only. The sub-floor temperature must be a minimum of 10oC . Not suitable for asphalt and timber sub-floors that subject to heavy duty traffic areas.

Storage

It should be stored under the same conditions as cement; store it in cool, dry shaded warehouses at 25oc and 50% relative humidity. When stored under the correct conditions it will have a shelf life of 6 months.

Clean

Clean the tools with water before drying.

Precautions

Avoid contact with skin and eyes; in case of contact with the eyes, rinse immediately with plenty of water and seek medical advice; wear suitable gloves and keep the product out of the reach of children. Avoid generation of airborne dust during mixing.

 

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