PROJECT SPECIFICATION · Web viewThe method statement for the removal and replacement of the...

TABLE OF CONTENTS

1. TENDER SPECIFICATIONS

Project Specifications, Bill of Quantities, and other requirements are specified in the rest of this document, commencing on the next page.

W Louw and Associates ccUnisa Main Campus (Muckleneuk): Waterproofing of the 3rd floors of the OR Tambo and the Cas van Vuuren Buildings

CONTENTS PAGE TO SPECIFICATION

SECTION A

Project SpecificationGeneral Remedial Work: Variations of Standardized SpecificationSpecification RBP: Rubber Bitumen Polyurethelene Waterproofing of a Concrete RoofSpecification RWS: Remedial Waterproofing SealantsSpecification AW: Acrylic Waterproofing Counterflashing

SECTION B

Schedule of Quantities

SECTION C

ANNEXURE A: Services UsageANNEXURE B: Proposed Sources of Supply of Material

SECTION D

Drawings

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SECTION APROJECT SPECIFICATION

SCOPE

This project specification is set out in two portions. Portion 1 covers a general description of the project, the facilities available, and the requirements to be met. Portion 2 covers variations and additions to standardised and/or particular specifications applicable to this Contract.

STATUS

Should any requirements of the project specification conflict with any requirements of the standardised specifications listed in clause PS9, the requirements of the project specification shall prevail.

PART 1

THE WORKS

PS1 GENERAL DESCRIPTION

This Contract comprises inter alia of the re-waterproofing of the 3rd floors of the OR Tambo and the Cas van Vuuren Buildings at the Unisa Main Campus (Muckleneuk)

The work is broadly described, but not limited to:

Screed remedials

Removal of the existing waterproofing to spoil. Remedials to the screeds as indicated by the Engineer.

Sealing of joints

The sealing of joints as inspected by the Engineer.

Waterproofing of roof slabs

Waterproofing of roofs with a rubber bitumen systems.

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Waterproofing of facades

Seal all joints of the pre-cast facades.

PS2 NATURE OF GROUND AND SUB-SOIL CONDITIONS

Not applicable to the project.

PS3 DETAILS OF CONTRACT

The Bills of Quantities have been documented in a manner that indicates the Scope of Work for the above contract.

PS3.1 Preliminary and General

This includes all cost for the waterproofing Contractor to meet his contractual obligations.

PS3.2 Paving and screeds

Remove the paving to stockpile and replace after waterproofing. Repairs to defective screeds.

PS3.3 Waterproofing of Roofs

Remove the existing waterproofing to spoil. Re-waterproof the roof including counterflashing.

PS3.4 Sealing

Removal and replacement of all sealants.

PS4 CONSTRUCTION PROGRAMMING

PS4.1 Starting/completion dates

Anticipated start date:Completion date: Four months

PS4.2 Programmes and reports required

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In addition to the requirements of Clause 15 of the Conditions of Contract, the following requirements shall prevail:

4.2.1 Contractual programme

A contractual programme, meaning: a chart showing the different sections of construction making up the Works and the order, resourcing and sequence in which the work is to be carried out in order to achieve completion on the prescribed dates shall be submitted with the waterproofing Contractor's tender. This programme shall, upon the Engineer's agreement in writing become binding on the parties to the contract.

Such program shall include for possible delays for inclement weather.

The Contractual program shall in addition clearly indicate any Contractor’s float as may be applicable.

4.2.2 Construction programme

A construction programme, meaning: an agreed chart which shall be used to monitor the progress of the works shall be submitted within 14 days of agreement of the contractual programme by the Engineer. This chart shall, as far as is practical, be based upon the agreed contractual programme, but shall not in any way relieve either party of their obligations or rights in terms of the contractual programme or the contract. The chart shall show the different sections of the Works suitably divided into elements and activities, clearly indicating the start and completion dates of each activity and element against which the progress shall be monitored.

The waterproofing Contractor is advised to determine the programming requirements of section 7.10 described below.

PS4.3 Reports required

The waterproofing Contractor shall provide the Engineer a fortnightly report detailing the following:

a) Date of reportb) Working days elapsed from startc) Working days left to contractual completion and/or key dates and

forecast of any slippage envisagedd) Percentage of work complete per activities on construction programme

and forecast remaining time and resources requirede) Supervisory staff and labour force on siteg) List of constructional planth) Delays encounteredi) Information required j) Variation Orders and site instructions received

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k) Claims status (if any)l) Weather delaysm) Signature of site agent

The waterproofing Contractor shall in addition provide the Employer with weekly returns showing the number and grade of Employees employed and the number and type of Constructional Plant on site.

PS5 SITE FACILITIES AVAILABLE

PS5.1 Water for the Works

Potable water will be supplied free of charge by the Employer at points to be identified at commencement of works. The cost of further temporary reticulation shall be to the waterproofing Contractor's account.

PS5.2 Power supply

Power will be supplied free of charge by the Employer at points to be identified at commencement of works. The costs of any temporary reticulation; transformers, etc. shall be to the waterproofing Contractor's account.

PS5.3 Lay-down area

A specific area will be set aside for the use of the waterproofing Contractor. The location of the area shall be agreed with the client prior to commencement of works.

PS6 SITE FACILITIES REQUIRED

PS6.1 Accommodation of labour force

No employees are to be accommodated on site. The waterproofing Contractor shall issue his employees with a Company overall for easy identification.

PS6.2 Temporary storage facilities

The waterproofing Contractor shall make provision in his price for all temporary storage facilities if necessary. The location of these shall be agreed with the client prior to the commencement of works.

PS6.3 Laboratory facilities

Not applicable.

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PS6.4 Ablution and latrine facilities

No sanitary facilities for the specific use of the Engineer or their staff need be provided.

The waterproofing Contractor shall make provision for adequate and approved temporary ablution and latrine facilities for his workmen on site and their removal on completion of the Works. These facilities are to be kept in a clean and hygienic condition, to the approval of the Engineer, at all times.

PS6.5 Telephone facilities

Contractors will not have access to existing telephone facilities and must make their own arrangements in this regard.

PS6.6 Equipment for Engineer's staff

No equipment for the engineering staff needs to be provided.

PS7 FEATURES REQUIRING SPECIAL ATTENTION

PS7.1 Work on the roof of an operating building

The Works are being undertaken on the roofs and facades of an operating building at Unisa Main Campus (Muckleneuk), where normal office activities and meetings will be on-going. Further a portion of the work will be undertaken in front of the main entrance to the buildings. Noise and dust will have to be kept to a minimum. Rates must allow for a margin of discontinuity of operations to the Works under this Contract. No claims for disruption of access or for the working of abnormal hours due to the above factors, or restrictions on work hours due to noise will be entertained.

PS7.2 Existing Services

The location of existing services which may be affected by the works must be ascertained by the waterproofing Contractor. Any damage caused by the waterproofing Contractor to existing structures and services shall be repaired, to the satisfaction of the Engineer.

The existing services that need to be moved for the waterproofing activities will be arranged by the Client and done by others i.e., cable racks and airconditioning units. The waterproofing Contractor must give two weeks’ notice for the removal of services.

PS7.3 Dust

The waterproofing Contractor shall take all necessary precautions to keep dust caused by the remedial activities to a bare minimum.

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PS7.4 Prevention of ingress of water into Works

The waterproofing Contractor must accept full responsibility, without the payment of specific compensation, for all risks arising from the ingress of water. He shall take all possible measures and precautions, as he may deem necessary and expedient, to prevent water from entering the building.All costs that could be incurred in preventing the ingress of water are to be included in the waterproofing Contractor's scheduled rates.

PS7.5 Liquid fuels and lubricants

The waterproofing Contractor shall supply all required liquid fuels and lubricants.

PS7.6 Key personnel

The waterproofing Contractor shall furnish the Employer with a list of addresses and telephone numbers of key personnel in the waterproofing Contractor's organisation who may be contacted in an emergency both during and outside office hours.

PS7.7 Site meetings

The Engineer shall hold regular site meetings in respect to the waterproofing, one per week for the duration of the contract and keep and circulate minutes. The waterproofing Contractor shall attend these.

PS7.8 Removal of rubbish and debris

Contractors shall, at all times, keep the site and surrounding areas free of all superfluous materials, rubbish, debris, etc. A temporary dumpsite area will be identified at the Site inspection. The waterproofing Contractor is to allow for fencing off of this area with a shade cloth covered fence, and is to ensure the works remain contained within the fenced off area.

PS7.9 Access

Access to the Unisa Main Campus (Muckleneuk) premises will be identified at the site inspection. No employee of the waterproofing Contractor will be allowed onto premises without proper identification. The movement of men, equipment and material to the roof will be restricted and as agreed at the site inspection.

Prices to include for all access requirements.

PS7.10 Programming

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The waterproofing Contractor is advised that the programming of the works remains their responsibility. However it is possible that there will be some areas where the working period will be restricted to out of normal working hours particularly with regard to the “noisy” activities.

It is the intention of this contract to provide the waterproofing Contractor with uninterrupted access and working hours.Rates must allow for any interrupted access and the waterproofing Contractor's attention is drawn to clause PS7.1 in this regard.

PS7.11 Control of work and Quality Assurance

It is an essential element of this contract that the control of the work, the Quality Control and Quality Assurance falls under the direct control of the waterproofing Contractor. Should the Tenderer have a specialist sub-contractor special arrangements will be required in terms of their contractual arrangement to ensure that the above control is possible. Such arrangements are to the Tenderers discretion but the Tenderer must demonstrate that the arrangement is functional and workable to the entire satisfaction of the Engineer.

The Quality Control on site shall be structured, and the Quality Control Manager of such a position as to have a veto on the progress of the works. Attention to detail will be of prime importance. Should the Quality be of an unacceptable standard, the Engineer, who shall be the sole arbitrator as to the sufficiency of the standard achieved shall stop the Works and no other work shall continue until the Quality is of an acceptable standard.

PS8 SECURITY AND SAFETY

PS8.1 Security

All security regulations set forth by the Unisa are to be strictly adhered to and the waterproofing Contractor is to make himself fully acquainted with all and any security conditions regarding personnel, material and equipment entering or leaving the property.

The waterproofing Contractor shall, if so required by the Unisa at any time during the currency of the Contract, remove from the works any employee engaged by him on the works and shall provide suitable replacements.

Should the Unisa disclose the reason for requesting such removal, all costs involved in such removal and replacement shall be borne by the waterproofing Contractor.

Should the Unisa not disclose the reason for requesting such removal, all costs involved in such removal shall be for the account of the Unisa.

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Should an employee or employees employed by the waterproofing Contractor be required to leave the Site, the Contractor's obligations in terms of the waterproofing Contract shall in no way be altered.

PS8.2 Safety

8.2.1 The waterproofing Contractor shall provide, maintain and remove such hoarding, fans, screens, tarpaulins, drop sheets and other materials and items required to effectively uphold and protect from damage the works, materials and property of the Unisa and to secure the safety and freedom from injury of all persons.

8.2.2 The waterproofing Contractor shall comply with the Unisa’s safety/security regulations.

PS9 APPLICABLE STANDARDISED SPECIFICATIONS

PS9.1 For the purpose of this Contract the Standardised Specifications and Codes of Practice for Civil Engineering Construction as approved by the Council of the South African Bureau of Standards as issued at date of tender shall apply.

SABS 1200A - GENERALSABS 1200C - SITE CLEARANCE

PS9.2 For the purposes of this Contract, the following Particular Specifications are included:

RBP: RUBBER BITUMEN POLYURETHELENE WATERPROOFING OF A CONCRETE ROOF

RWS: REMEDIAL WATERPROOFING SEALANTSAW: ACRYLIC WATERPROOFING COUNTERFLASHING

PS10 DRAWINGS

The following drawings are issued with this document and are deemed to form part of this documentation.

Detailed drawings of waterproofing:

Drawing no. WLA-OTCVV:001 Parapet termination Drawing no. WLA-OTCVV:002 Fullbore outlet Drawing no. WLA-OTCVV:003 Pipe protrusion detail Drawing no. WLA-OTCVV:004 Expansion joint

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Drawing no. WLA-OTCVV:005 Window frame

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GENERAL: REMEDIAL WORK

VARIATIONS OF STANDARDISED SPECIFICATIONS

PSA1 MATERIAL

PSA1.1 Quality

All materials are to bear the mark of the South African Bureau of Standards where a standard is applicable to the particular material.

Materials shall be the best of their kind. Only new and undamaged materials shall be used in the Works. Materials to be permanently installed into the Works shall not be used for any temporary purposes on site.

Where reference is made in these Schedules of Quantities to proprietary types or trade names, the products or materials, etc., are, unless otherwise described, to be exactly those described.

Should the Tenderer wish to price for, or to supply, a similar article not of the specified type and/or method of manufacture, application must be made to the Engineer not less than seven days prior to the closing date of tenders, to enable the Engineer, to indicate his approval.

After the signing of the Contract the prior approval of the Engineer must be obtained for any substitution and where materials, etc. are used other than those specified, adjustments in rates will be made and variation orders will be issued to substantiate these adjustments.

In all cases the word "approved" shall mean "approved by the Engineer".

In all cases where the waterproofing Contractor takes delivery of, handles, stores, applies and/or fixes any proprietary product, he shall do so in strict accordance with the manufacturers’ authorised written recommendations and/or instructions.

In the event of a discrepancy between the Project Specification and the manufacturers’ instructions, it shall be brought to the attention of the Engineer.

PSA1.2 Structures and Natural Materials on Site

Old materials

Unless otherwise stated the whole of the materials arising from the alterations/remedial work, shall become the property of the waterproofing

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Contractor and shall be carted away from site immediately it becomes available.

The Employer reserves the right to retain any of the materials at the price shown in the list of credit for materials or if no price is shown in that list at no charge to the Employer.

Material set aside for re-use

Old materials specified as set aside for re-use, shall be carefully removed, cleaned, repaired as necessary, classified, stacked, stored and properly protected from damage until required for re-use.

Handing over of materials

Where certain materials, equipment, articles etc. are described to be handed over to the Employer, the waterproofing Contractor shall obtain from the Employer an official receipt listing the materials handed over and the date of handover. Should the waterproofing Contractor fail to submit such a receipt when requested to do so, it shall be deemed that the materials, equipment, articles etc., are still in his possession and he will be held liable for the full replacement value thereof, the value of which will be deducted from any moneys due to the Contract.

PSA2 PLANT

PSA2.1 Contractor's Offices, Stores and Services

The Accommodation of employees on the site will not be permitted and the waterproofing Contractor shall make arrangements to accommodate his employees elsewhere.

PSA3 PROTECTION OF STRUCTURES

In taking off and removing the existing waterproofing membrane etc. the utmost care must be observed to avoid any structural or other damage to the remaining portions of the work.

Such damage that is made to other elements shall be made good at the waterproofing Contractor’s expense.

The method statement for the removal and replacement of the defective concrete screed shall be submitted to the Engineer for approval.

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PSA4 TENDERER TO DEMONSTRATE ABILITY

The successful Tenderer must be able to demonstrate, to the Engineer’s satisfaction, that he is equipped to carry out the remedial works tendered for. The Engineer shall be the sole judge as to the Tenderer’s ability or otherwise. The successful Tenderer shall also be required to demonstrate that they have at least five (5) years’ experience in the relevant field of remedial works.

PSA5 SITE VISIT

It is an essential condition of this contract that the waterproofing Contractor visits the site to determine the exact working conditions, access, nature of the remedial works and the intended scope of work. The submission of a Tender shall be deemed to be evidence of his visiting site notwithstanding anything to the contrary. No claim will be accepted for work not envisaged at tender stage which was ordinarily visible at such a site visit or was pointed out to the waterproofing Contractor at the Site inspection.

PSA6 EXTENSION OF TIME DUE TO RAIN

The waterproofing Contractor is advised that only the official records of the nearest meteorological station will be considered for the application of extension of time due to rain. Should there not be a meteorological station within the vicinity and the waterproofing Contractor considers that he will be prejudiced as a result, he is to install at contract commencement a rain gauge, which is to be monitored and recorded daily.

PSA7 TESTING

PSA7.1 Principles

These clauses are amended to provide that the waterproofing Contractor shall implement a quality control and assurance programme in accordance with the "Quality Assurance program" to be prepared and submitted by the waterproofing Contractor to form part of these tender documents.

The waterproofing Contractor shall provide all necessary personnel and facilities to implement the programme including the provision of a qualified and competent quality control technician whose time will be solely devoted to quality control and assurance matters for the full duration of the contract.

Tenderers are to allow for all costs associated with implementing the QA/QC programme under the heading of "Quality Assurance" in the Preliminary and General section of the schedules of quantities.

PSA8 PROTECTION OF SERVICES

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The waterproofing Contractor shall protect all drainage pipes, water supply, electrical cabling as shown on the drawings or as may be indicated on site.

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PART II

SPECIFICATION RBP: RUBBER BITUMEN POLYURETHELENE WATERPROOFING OF A CONCRETE ROOF

CONTENTS

CLAUSE DESCRIPTION

RBP1 SCOPE

RBP2 DEFINITION

RBP3 MATERIALS

RBP4 CONSTRUCTION

RBP5 TESTING

RBP6 GUARANTEE

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SPECIFICATION RBP: RUBBER BITUMEN POLYURETHELENE WATERPROOFING OF A CONCRETE ROOF

RBP1 SCOPE

This specification covers the requirements for the waterproofing of the concrete roofs of the 3rd floors of the OR Tambo and the Cas van Vuuren Buildings.

RBP2 DEFINITIONS

(a) Waterproofing membrane

Shall be a factory manufactured Polymer modified reinforced rubber bitumen membrane of minimum thickness 1,6mm.

(b) Monolithic concrete slab

Shall be a mixture of cement, sand, stone and water fully bonded to the existing substrate.

(c) Monolithic sand/cement screed

Shall be a mixture of cement, sand and water fully bonded to the existing substrate.

(d) Polymer modified screed

Shall be a Polymer modified proprietary material

RBP3 MATERIALS

(a) Cement

Cement shall be Ordinary Portland Cement or Rapid Hardening Portland Cement complying with the requirements of SABS ENV 197-1. CEMI 32, 5 or CEMI 42,5.

(b) Aggregates

Aggregates shall comply with the requirements of SABS 1083 or SABS 1090.

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(c) Membrane

The membrane shall be a two layer rubber bitumen membrane with a minimum of 1,6mm thickness. The layer over the expansion joint shall be loose laid for at least 200mm over the joint.

RBP4 CONSTRUCTION

The installation of the membrane shall be done strictly in accordance with the manufacturers’ recommendations which will form an integral part of this specification.

RBP4.1 Screed to fall

RBP4.1.1 The waterproofing Contractor is to inspect the screed to determine whether it is adequate to receive his waterproofing membrane. Any discrepancies shall be brought to the attention of the Engineer.

RBP4.1.2 Allowance is to be made by the waterproofing Contractor to rectify minor defects with a polymer modified proprietary material.

RBP4.1.3 Major defects in the screed where the depth exceeds 20 mm shall be repaired using the following 9:3:1 repair mortar mix:

Vaal river concrete sand: 9 partsCemI 32,5 cement: 3 partsProStruct 610: 1 part

RBP4.2 Fillets and terminations

Corner fillets shall be constructed, if not present, between the junction of the roof slab and the parapet or other walls.

External corners shall be chamfered to at least 50 mm x 50 mm.

The waterproofing membrane shall be a continuous system and be terminated with the plain membrane up the vertical surface of the brick walls to a height of 150 mm.

The membrane shall be tucked into a groove in the brick wall and then be sealed along the full length with a 20 mm x 20 mm polyurethane sealant.

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RBP4.3 Joints and cracks

Prior to the application of the waterproofing membrane joints and cracks shall be identified and masked with masking tape exceeding the crack or joint by 15 mm on either side.

RBP4.4 Application of waterproofing membrane

The waterproofing Contractor shall test the screed for moisture prior to commencing with the waterproofing.

A simple test of dryness is to tape down a 200 mm x 200 mm PVC sheet on the concrete surface for a period of 24 hours. The edges of the PVC sheeting must be sealed with tape. If moisture droplets are observed on the sheeting then the surface is not dry enough for the membrane to be applied.

RBP4.4.1 Priming

Prime all surfaces with a solvent free primer as recommended by the suppliers.

RBP4.4.2 Membrane application

Apply one layer of 1,6mm rubber bitumen reinforced membrane fully bonded onto the primed area, including side laps utilizing the laps, as provided by the Manufacturer.

The waterproofing membrane shall be laid lengthwise in the direction of the fall. Laps shall be limited to the minimum. A 1,6mm membrane shall be laid with the laps in the long direction staggered to those of the first layers.

RBP4.4.3 Terminations

The terminations around protrusions, into the outlets and onto the walls, shall be finished with a 1,6mm thick membrane. The membrane shall be covered with a mineral chip waterproofing membrane where exposed to ultra violet rays. The membrane onto the walls, shall be finished off with a 20 mm bead of polyurethane sealant prior to counterflashing with an acrylic waterproofing membrane as described in specification AW.

RBP4.4.4 Geotextile sub-layer

The paves as described above shall be placed on a polypropylene non-woven needle punched regenerated staple fibre of 400 g/m2 geotextile.

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RBP5 TESTING

The Contractor is to allow for the removal of 10 test strips of the membrane overlap joints of at least 200 mm x 30 mm. The area shall be repaired using the plain membrane to the recommendations of the manufacturer.

RBP6 GUARANTEE

The Contractor is to submit a ten year guarantee for the waterproofing to the roof area including all terminations.

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SPECIFICATION RWS: REMEDIAL WATERPROOFING SEALANTS

CONTENTS

CLAUSE DESCRIPTION

RWS1 SCOPE

RWS2 SUPPORTING SPECIFICATIONS

RWS3 GENERAL

RWS4 MATERIALS

RWS5 APPLICATION OF SEALANTS

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SPECIFICATION RWS: REMEDIAL WATERPROOFING SEALANTS

RWS1 SCOPE

This specification covers the requirements for the remedial waterproofing sealants, sealing of junctions and joints.

RWS2 SUPPORTING SPECIFICATIONS

The following specifications shall, inter alia, form part of this specification:

(a) SABS 1200.(b) The project specification(c) SABS 1077.(d) SABS 021.(e) Manufacturer’s data sheet of specific products specified in the specified

approved product list and Schedule of Quantities.

RWS3 GENERAL

3.1Generally

The work described herein generally relates to the remedial waterproofing sealants of the joints. The work includes, but is not limited to:

(a) Sealing of junctions.(b) Sealing expansion joints in concrete.(c) Sealing of cracks.

3.2Work to be carried out by Specialist

An approved Specialist using artisans, shall carry out the work detailed in the Specification and staff skilled and experienced in the use of sealant and coating materials and additives, referred to hereunder.

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RWS4 MATERIALS

4.1 Sealant

Shall comply with the requirements of SABS 1077 for polyurethane sealant.

4.2 Primers

Only primers approved by the Manufacturer of the sealant are to be used.

4.3 Single pack polyurethane sealant

The following sealants are approved:

ProStruct 642 Joint sealant. Sika Flex Pro 2 HP.

RWS5 APPLICATION OF SEALANTS

5.1 Junctions and joints

Remove all failed sealants from the joints and junctions. All junctions and joints to be sealed must be carefully inspected.

Any loose material, dust or foreign matter is to be removed to give the sealant a firm base to be bonded to. If the width of the junction exceeds 5mm a backing cord is to be installed prior to the application of the sealant.

The sealant is to be applied strictly in accordance with the manufacturer's instructions with particular reference to primers etc.

5.2 Expansion joints

5.2.1 Joint Sealant

A suitable rope and bond breaker such as Polycord having a dimension of approximately twice the size of the joint shall be carefully inserted into the joints so that a snug fit is achieved. The Polycord or other suitable backing shall be clear of the top surface of the concrete by 8 mm to10 mm.

It is essential that the backing rope is squeezed between the two surfaces to ensure that the expansion joint sealant does not exceed a maximum depth of 10 mm.

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The two prepared and cleaned vertical surfaces on which the polyurethane sealant must be adhered shall be primed with the approved primer. A continuous bead of polyurethane sealant, shall be applied into the joint over the Polycord. The thickness of the bead shall not exceed 10 mm. The application shall comply with the manufacturer's recommendations and data sheets.

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SPECIFICATION AW: ACRYLIC WATERPROOFING COUNTERFLASHING

CONTENTS

CLAUSE DESCRIPTION

AW1 SCOPE

AW2 SUPPORTING SPECIFICATIONS

AW3 GENERAL

AW4 PREPARATION OF THE CONCRETE SURFACE

AW5 WATERPROOFING MATERIAL AND COATINGS

AW6 APPLICATION OF ACRYLIC WATERPROOFING MEMBRANE

AW7 MEASUREMENT AND PAYMENT

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SPECIFICATION AW: ACRYLIC WATERPROOFING COUNTERFLASHING

AW1 SCOPE

This specification covers the requirements for the counterflashing of the rubber bitumen waterproofing on vertical walls.

AW2 SUPPORTING SPECIFICATIONS

The following specifications shall, inter alia, form part of this specification:

The project specification SABS 1200 Series The Manufacturer’s Instructions

AW3 GENERAL

3.1 Generally

The work described herein generally relates to the remedial waterproofing of the of the 3rd floors of the OR Tambo and the Cas van Vuuren Buildings at Unisa Main Campus (Muckleneuk). However, similar principles apply to other waterproofing remedial work which may occur.

3.2 Work to be carried out by specialist

The work detailed in the Specification shall be carried out by any approval specialist, using artisans and staff skilled and experienced in waterproofing and waterproofing remedials and the use of the specialist waterproofing and coating materials.

3.3 Protection of finishes and existing structures

The Contractor shall provide adequate protection to all adjoining elements including sealants, waterproofing and walls, such that these are not damaged in any way during the aforementioned cleaning operations. During cleaning operations, all openings shall be adequately protected by the Contractor so as to prevent any ingress of abrasive or other cleaning material, e.g. water, etc.

Any damage occurring or cleaning necessary as a result of inadequate protection and/or negligence by the Contractor shall be rectified by the Contractor at his own cost to the satisfaction of the Engineer.

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In the event that the Engineer or his representatives deems the protection afforded to the works and surrounding elements to be inadequate, the Engineer reserves the right to decide that no waterproofing or coating work shall be undertaken.

3.4 Rain and Wet Conditions

Adequate protection is to be provided by way of fixed setting to the scaffolding, etc. to provide a dry working environment for the application of all waterproofing materials and coatings and such protection must be maintained until the initial set has taken place.

AW4 PREPARATION OF THE CONCRETE SURFACES

4.1 General

Remove all loose dust etc. from the surfaces. Prior to the applications of the membrane the concrete or brickwork shall be free from all contaminants including moss, lichen, algae oil, grease, efflorescence, laitance, joint sealant residue etc. All holes and defects in the wall shall be repaired prior to the waterproofing thereof using a cementitious polymer coating. In the event of brickwork, all perbs and joints shall be sealed.

4.2 Contractor to provide method statement

The Contractor shall include in his method statement his intended method of cleaning and preparation. However, such method statements will not limit in any way the Contractor's contractual obligations to meet the requirements of the proceedings and following sub-clauses and this Specification generally, to the entire satisfaction of the Engineer or his representatives.

The Contractor shall satisfy the Engineer prior to commencing with the works that his stated method of surface preparation is practical, economical and acceptable practise.

4.3 Cleaning of adjoining elements

All adjoining elements etc. shall be thoroughly cleaned of all cleaning materials and residue which remains resting upon or lodged in same, on completion of the aforementioned waterproofing.

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AW5 WATERPROOFING MATERIAL AND COATINGS

5.1 Material to be that specified

All waterproofing materials and coatings used in the works shall be those as specified and precisely as detailed in this Specification and in the manufacturer's technical data sheets which forms an integral part of this Specification.

5.2 Sand

Shall comply with SABS 1090 or 1083 and shall be washed and free from contaminants. Vaal river sand, meeting the above requirements, shall be used.

5.2 Cement

Shall be Portland Cement complying with SABS ENV 197 – 1(CEMI 32,5)

5.4 Water requirement

Water used shall be clean potable water.

5.3 Acrylic waterproofing

The acrylic waterproofing shall be ProStruct 684 or Sika 540.

AW6 APPLICATION OF ACRYLIC WATERPROOFING MEMBRANE

6.1 Surface preparation and priming

The Contractor is to remove any loose material protrusions or foreign material from the surface. Where applied to brickwork, the latter need to be plastered with a 9:3:1 mix 10mm thick. The surface must be smooth but have an open texture appearance prior to the waterproofing. This can be achieved by thorough mechanical abrading of all surfaces to which the membrane is to be applied. Any other means of preparation can be used by the Contractor. Areas where fungus growth is occurring are to be washed with the approved fungicide. Where applied to bare concrete or plaster, the substrate is to be dry prior to priming. The area where the membrane is to be applied is to be thoroughly dusted and then primed with the primer recommended by the manufacturer of the membrane.

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6.2 Application of membrane

The approved acrylic waterproofing membrane is to be applied in accordance with the manufacturers’ instructions and data sheets. A minimum of two full coats of saturant is to be applied in conjunction with the Geofabric. Additional coats of the saturant must be applied if full saturation is not achieved. Once the above operation has been carried out, one full coat of the topcoat specified by the manufacturer is to be applied. Where a defect in the existing waterproofing is being patched, a minimum overlap of 50 mm must be achieved between the waterproofing termination and the defect.

6.3 Application of maintenance coat

After applying the patches to areas where necessary and completing the waterproofing the entire surface area is to be high pressure water washed to remove all accumulated dirt and debris from the plastered walls. Within 12 hours of washing the plastered walls, two full coats of top coat are to be applied to the existing waterproofing membrane.

6.4 Termination down and up vertical walls

The waterproofing membrane shall be counterflashed over the roof waterproofing by 150 mm. Care shall be taken that a neat straight line is achieved. The colour of the final coating shall match the existing facade. The Contractor shall prepare a test sample of 1 m long for approval by the Engineer.

Counterflashing up die vertical wall shall be 150 mm above the waterproofing membrane and 150 mm over the waterproofing membrane.

AW7 MEASUREMENT AND PAYMENT

The pay items in this clause shall include full compensation for all work associated with the coating of concrete, plaster or mild steel elements or portions thereof which are already covered by the measurement and payment items of the Standard Specification or the Project Specification e.g. all procurement, transport, access and temporary works, plant and equipment required to undertake the work specified.

The quantities indicated in the Schedule of Quantities are based on inspections performed as part of the preliminary and detail design phases. The actual work may result in significant variations as the work is executed which shall be considered in terms of the Special Conditions of Contract.

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Item Unit

AW7.1 Surface preparation for the waterproofing of the brick work prior to counterflashing (m²)

The unit of measurement is the square metre surface area as prepared.

The tendered rate shall include full compensation for all labour, materials, equipment, etc. that is required to prepare the surface to achieve a plastered finish prior to waterproofing and shall include the preparation and application of Biocide and minor patching and stopping.

Item Unit

AW7.2 Waterproof counterflashing of waterproofing on verticalwalls with an acrylic waterproofing membrane. (m²)

The unit of measurement is the square metre surface area as waterproofed.

The tendered rate shall include full compensation for all labour, materials, equipment, etc. that is required for the waterproofing of the concrete or plaster surfaces.

Item Unit

AW7.3 Maintenance coat (two coat system). (m²)

The unit of measurement is the square metre surface area as waterproofed.

The tendered rate shall include full compensation for all labour, materials, equipment, etc. that is required to apply two maintenance coats to the existing acrylic waterproofing.

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SECTION B

BOQ – ORT & CvV Building (Attached document)

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SECTION C

ANNEXURE A

SERVICES USAGE

The Tenderer is to state below the daily services requirements needed to execute the Works:

DAILY DEMAND PEAK

(a) Potable Water kilolitres …………….. ……………..

(b) Electricity (380V 3-Phase) ……………... …………….. kW

(c) Other (specify) …………….. …………….. kW

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ANNEXURE B

PROPOSED SOURCES OF SUPPLY OF MATERIALS

Tenderers shall state hereunder the proposed manufacture of source of supply of materials for use in the execution of Works:

Material Type of Trade Name Source

1.0 OTHER MATERIALS

(a)

(b)

(c)

(d)

(e)

(f)

………………………….

………………………….

………………………….

………………………….

……………………………

……………………………

……………………………

……………………………

SIGNATURE: …………………………………….

NAME: …………………………………….

ADDRESS: …………………………………….

…………………………………….

…………………………………….

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SECTION D

DRAWINGS

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