U.S. Embassy Windhoek, Namibia - State · U.S. Embassy Windhoek, Namibia Project Number: ......

U.S. Embassy Windhoek, Namibia

Project Number: XJ-VF-0129

Final Submission

RENOVATION OF BATHROOMS AND WINDOW

REPLACEMENT AT THE MARINE SECURITY GUARD

RESIDENCE, ERF 683, DAAN BEKKER STREET, OLYMPIA,

WINDHOEK, NAMIBIA

UNITED STATES EMBASSY FACILITIES MAINTENACE OFFICE JULY 2015 WINDHOEK, NAMIBIA

2 | P A G E RENOVATION OF BATHROOMS AND WINDOW REPLACEMENT PROJECT NUMBER: XJ-VF-0129

1. PROJECT INTRODUCTION: 3

1.1 SUMMARY 3

A. PROJECT IDENTIFICATION 3

1.2 SUBMITTALS 4

1.3 QUALITY ASSURANCE 4

1.4 WORK RESTRICTIONS 5

A. CONTRACTOR USE OF PREMISES 5

B. EMBASSY OCCUPANCY 5

C. WORKING HOURS 5

D. PROTECTION OF PERSONNEL 5

E. RESPONSIBILITY OF THE CONTRACTOR 6

1.5 CONTRACT ADMINISTRATION 6

1.6 PRE-CONSTRUCTION REQUIREMENTS 7

1.7 CONSTRUCTION REQUIREMENTS 7

1.8 DELIVERABLE SCHEDULE 7

1.9 MILESTONES 8

1.10 PAYMENTS 8

1.11 PROJECT COMPLETION 9

1.12 PROJECT SECURITY 9

A. GENERAL SECURITY REQUIREMENTS 9

B. GENERAL SECURITY REGULATIONS 9

2. MATERIAL RESOURCES: 10

2.1 PRODUCTS 10

A. MANUFACTURERS 10

B. DELIVERY, STORAGE AND HANDLING 11

3. CONSTRUCTION NOTES: 11

3.1 EXECUTION 11

3.2 PREPARATION/PROTECTION OF WORK AREA 11

3.3 EQUIPMENT 11

3.4 TECHNICAL SPECIFICATION 12

ADDENDUM A - GENERAL ITEMS AND PROCEDURES 25

ADDENDUM B - BILL OF QUANTITIES 26

ADDENDUM C - DRAWINGS 27



1. PROJECT INTRODUCTION

1.1 SUMMARY

A. PROJECT IDENTIFICATION 1. Project Name and Location:

2.1 The renovation of Bathrooms and Window Replacement located at the Marine Security

Guard Residence, Erf 683, Daan Bekker Street in Windhoek, Namibia.

Project number: XJ-VF-0129.

Architects’ project number: 1511

1. Project Summary Description:

The U.S. Embassy Windhoek requires the services of a qualified Contractor to

renovate bathrooms of approximately 22.3m² and replace windows on the

whole building. The project includes but is not limited to the following work:

a. Renovation of bathrooms and conversion of toilet into a shower.

b. Replace steel windows, as indicated, with aluminium windows.

c. Levelling of the basketball court, recasting of the concrete finish,

levelling of the adjoining area and providing a suitable finish to the area.

d. Providing a hatch and a cat-ladder onto the roof of the bedroom block.

e. Closing up of a door opening.

f. Attending to a sub-contractor installing roller shutter blinds.

g. Inspecting the current sewer line for documentation purposes and any

maintenance work arising therefrom, as well as all opening up and

closing of trenches as required.

h. Adequate lighting to be provided to basketball and volleyball areas.

i. Electrical work to an existing electrical installation, consisting of

providing separate and/or additional lighting to areas that are currently

on one switch, as well as providing dimmer switches to areas in the

installation, as required.

2. The Project was designed by:

Prinsloo Loubser Architects

3. Construction Manager:

The Construction Managers will be the Contracting Officer Representative

(COR) and the status relative to this project will be delineated in writing by the

Contracting Officer (CO).



The Contracting Officer Representative (COR) for the project is:

Mr. Orlin V. Clements

Facilities Manager

Address: 14 Lossen Street, Ausspannplatz, Windhoek

Phone: (061) 295 8505

E-mail: [email protected]

The Contracting Officer (CO) for the project is:

Ms. Isobel Miller

Address: 14 Lossen Street, Ausspannplatz, Windhoek

Phone: (061) 295 8631

E-mail: [email protected]

1.2 SUBMITTALS

1. The proposal by the Contractors shall include:

a. Company representative information:

Contact information of person who will be dealing with the execution of

the project. This must include a valid cellphone number, telephone

number and e-mail address/fax number.

b. Company information:

A brief introduction and summary of the Company and its previous work

must be submitted.

c. Plant and Equipment list:

Identify the proposed plant & equipment necessary to complete the

envisaged project. List all equipment owned and all equipment to be

hired if necessary.

d. List of previous experience:

Identify at least three previous projects with relevant contact persons.

e. Documents to be provided:

- statement from company that all work completed is guaranteed

for a period of twelve (12) months.

- statement from company ensuring personnel is experienced

and qualified to carry out all work.

- construction programme.

1.3 QUALITY ASSURANCE

1. Site foreman: Provide information and relevant documentation with regard to

any qualifications and/or experience.

mailto:[email protected]

mailto:[email protected]



2. Aluminium work: The aluminium supplier must be AAAMSA registered and

provide proof thereof.

3. Electrical work: All electrical work is to be completed by a qualified electrician.

1.4 WORK RESTRICTIONS

A. CONTRACTOR USE OF PREMISES

1. The Contracting Officer Representative will conduct a pre-construction survey

with the Contractor to review and document the existing conditions surrounding

the project premises prior to construction. The date for the pre-construction

survey will be scheduled after award of tender.

2. The Contractor shall have limited access to or not be admitted into any

structure outside the areas designated for the project except with permission by

the COR.

B. MSGR OCCUPANCY

1. The Residence will be occupied during the period of construction work. In any

case where there is movement or activity by the inhabitants, it is vital that there

be co-operated with them, to minimize conflicts and facilitate residence usage.

Perform the Work in a manner that does not interfere with the Residence’s

operations. Any work started on the day is to be completed insofar as possible

to enable the MSGR residents to continue their normal functioning.

C. WORKING HOURS

1. Contractor’s General Working Hours: The Contractor’s working hours shall be

generally established to occur as follows:

a. All construction work to occur during the Embassy’s Official Working

Hours, unless otherwise agreed upon with the Contracting Officer

Representative.

2. The Embassy’s Official Working Hours are on weekdays, Monday to Friday,

except for established Embassy holidays from 08:45 to 17:30.

D. PROTECTION OF PERSONNEL

1. The Contractor shall take all necessary precautions to prevent injury to the

public, occupants, of damage to property of others. The public and occupants

includes all persons not employed by the Contractor or a subcontractor.

2. Wherever practical, the work area shall be fenced, barricaded or otherwise

blocked off from the public or occupants to prevent unauthorized entry into the

work area.



3. Store and transport refuse and debris in a manner to prevent unsafe and

unhealthy conditions for the public and occupants. Remove refuse containers

on a frequent regular basis acceptable to the Contracting Officer

Representative.

E. RESPONSIBILITY OF THE CONTRACTOR

1. The Contractor shall provide construction personnel, equipment, materials,

tools and supervision as needed to complete the services that meet the

technical requirements in this Statement of Works. It is expected that the

Contractor shall partner closely with MSGR residents and personnel.

2. The work shall be executed in a diligent manner in accordance with a

negotiated firm fixed price and performance period. The period of performance

of the project shall be completed in 60 calendar days from Notice to Proceed.

3. The Contractor shall be required to prepare and submit reports; a list of

materials, quality control schedules, safety plan and construction works costs.

These documents shall provide the necessary interfaces, coordination and

communication between the COR and Contractor for the delivery of a

completed project.

4. The COR shall require the permanent presence in the works of a person in

charge, foreman or a representative of the appointed Firm, with ample

knowledge of the technical specifications and the works to be carried out.

5. Any cost associated with services subcontracted by the Contractor shall be

borne by and be the complete responsibility of the Contractor under the fixed

price of this contract.

6. A programme shall be provided by the contractor as a part of the proposal in

response to this solicitation.

7. The Contractor shall be responsible for the professional quality, technical

accuracy, and the coordination of all construction works and other services

furnished under this contract. The Contractor shall, without additional

compensation, correct or revise any errors or deficiencies, which is as a result

of poor quality workmanship. In the event that any work has to be redone, the

Architect and Contracting Officer Representative will, together with the

Contractor, inspect the works and a list of works to be redone will be submitted.

1.5 CONTRACT ADMINISTRATION

1. The Contractor shall not conduct any work that is beyond this Scope of Works

and accompanying specifications unless directed in writing by the Contracting

Officer. Any work done by the Contractor beyond this Scope of Works and



accompanying specifications without direction from the Contracting Officer will

be at the Contractor’s own risk and at no cost to the Embassy.

2. The Contracting Officer shall provide a Notice to Proceed [NTP] to the

Contractor. No work shall be initiated until notice has been issued.

3. The COR has the right to inspect and test all services called for by the contract,

at any time of the contract.

4. If any of the Contractor’s services do not conform to the contract requirements,

the Contracting Officer Representative may require the Contractor to perform

the services again in conformity with the contract requirements.

1.6 PRE-CONSTRUCTION REQUIREMENTS

1. The Contractor shall examine all the documents and visit the site to fully inform

themselves of all the conditions and limitations applied to the work and submit

a firm fixed price cost proposal for all the work. No subsequent cost allowance

will be made to the Contractor for neglect of the existing conditions.

1.7 CONSTRUCTION REQUIREMENTS

1. Cleanup: At the end of each working day all the areas where the works have

been developed must be left clean, without debris and apt for the normal

functioning of the MSGR. The withdrawal of the debris and/or other waste

materials must be made day after day and comply with local regulations. The

Contractor shall not use Embassy waste disposal facilities including garbage

cans, trash piles or dumpsters. Upon completion, the Contractor shall remove

all temporary facilities and leave the project site in a clean and orderly condition

acceptable to the Contracting Officer Representative.

2. All documentation produced for this project will become the ownership of the

Embassy at the completion of this project.

1.8 DELIVERABLE SCHEDULE

1. The Contractor shall commence work under this contract promptly, execute the

work diligently, and achieve practical completion and acceptance including final

cleanup of the premises within the period specified.

2. Prepare a weekly construction report recording the following information:

a. Count of personnel at the site

b. Accidents

c. Meetings and significant decisions

d. Summary of work performed



1.9 MILESTONES

1. Documents to be advertised:

Monday, 03 August 2015

2. Contractor Pre-Proposal Site Visit:

Monday, 17 August @ 10:00

3. Bids due:

Monday, 24 August @ 12:00 in a sealed envelope at the U.S. Embassy

for attention: CO Isobel Miller

4 Award of Contract & Notice to Proceed:

Monday, 28 August

5. Pre-Construction Submittals:

a. Contractor’s Safety Plan - within 7 days after award

b. Employees list and vehicles - within 7 days after award

c. Programme: - within 7 days after award

6. Construction:

The construction period is 60 calendar days.

7. During Construction:

a. Employees list for after-hours works:

provide list 48 hours before proceeding with works.

b. Accident reporting:

provide report 7 days after the date of the accident.

c. Additional employees lists:

provide list 7 days before the date of the access.

1.10 PAYMENTS

1. Payment schedule shall be as stated in the solicitation

2. The Contractor shall provide a fixed priced lump sum proposal to the

Contracting Officer. The Contractor may submit requests for progress

payments at monthly intervals to cover the value of labor and materials

completed to date.

3. The Contractor shall submit one copy of all payment invoices.



4. The Contracting Officer Representative will determine if the invoice is complete

and proper as submitted. The Contracting Officer Representative will also

determine if billed services have been satisfactorily performed and if expenses

billed are correct. If it is determined that the amount billed is incorrect, the

Contracting Officer Representative will within seven days, request the

Contractor to submit a revised invoice.

5. The Contractor shall specifically identify his last invoice: ‘Final Invoice’. The

Final invoice shall include a proof to the Contracting Officer Representative that

all accounts are balanced and settled with it.

1.11 PROJECT COMPLETION

1. Once the works have been finalized, a general inspection of the works shall be

carried out with the Architect, Contractor and Contracting Officer

Representative. If from such inspection it should arise that any of the works

has not been done in accordance with the Contracting Officer Representative,

or are of low quality or not in line with the technical and descriptive

memorandum, the same shall have to be re-done without implying extra costs

for the Embassy.

1.12 PROJECT SECURITY

A. GENERAL SECURITY REQUIREMENTS

1. Bidding Clearances: Bidders will be required to comply with security

Regulations imposed by the Regional Security Office (RSO). Access to the

project site will be limited to specific times established by the Embassy.

2. Construction Clearances: After award of the Contract, all Contractor

employees shall be required to furnish information for security clearances and

shall comply with security regulations as imposed by the Regional Security

Office.

B. GENERAL SECURITY REGULATIONS

1. At the commencement of the work under this Contract, the following security

facilities and procedures will apply:

a. The Contractor shall provide information about all Contractor and

Subcontractor personnel and others who require continuing access to

the site, before access is required and when access ceases.



b. Within five (5) calendar days after the award of the Contract, the

Contractor shall submit a list on the Contractor’s letterhead stationary of

all employees, subcontractors and their employees, and others who will

perform work or otherwise require access to the site including the

Contractor’s vehicles. The Company shall list personnel in alphabetical

order. The list shall include the full name, ID number, date of birth,

place of birth and nationality for each individual and the brand, model,

year and plate number for the vehicles.

c. Name of any employee and vehicle requirements added later to the

original list shall be submitted with the same information on the

Contractor’s letterhead stationary at least seven (7) calendar days in

advance of the date of access by the employee or vehicle.

d. The Contractor shall notify the Embassy in writing when personnel are

no longer employed by the Contractor or Subcontractor.

e. The Contracting Officer has the authority to issue a temporary stop

order during the execution of any particular phase of this Scope of

Works. This authority may be executed when the MSGR requires time

for official functions. The Contractor shall promptly notify the

Contracting Officer that work has been stopped. The Contractor may

only return to the site with verbal approval from the Regional Security

Office and the Contracting Officer or the Contracting Officer

Representative.

f. The Embassy reserves the right to exclude or remove from the site or

building any employee of the Contractor or a subcontractor whom the

Embassy deems incompetent, careless, insubordinate or otherwise

objectionable, or whose continued employment on the work is deemed

by the Embassy to be contrary to the public interests.

g. For overtime work, the Contractor shall give the Contracting Officer

Representative at least three (3) calendar days’ notice. This notice is

required so that security escorts may be provided.

2. MATERIAL RESOURCES:

2.1 PRODUCTS

A. MANUFACTURERS

1. The Contractor is to make use of good quality materials. If Contractor makes

use of sub-standard material, the Contractor will be held liable for any

rectification at his own cost.

2. The Contractor is urged to purchase material from reliable suppliers.

3. All material must be approved and comply with the Building Regulations.



B. DELIVERY, STORAGE AND HANDLING

1. The Contractor shall transport and safeguard all materials.

2. Materials shall be carefully handled, properly stored, and adequately protected

to prevent damage before and during installation, in accordance with the

manufacturer’s recommendations. Damaged or defective items shall be

replaced. The contractor will be responsible for the security of all materials.

3. The Contractor will be provided with a storage and staging area as determined

by the COR. The Contractor shall be responsible for restoring the area to its

original condition at the completion of the work. The Contractor shall be

responsible for repair of any damage incurred to buildings or pavement as a

result of storage activities. The Contractor is responsible for obtaining an

additional off compound storage areas as required.

3. CONSTRUCTION NOTES:

3.1 EXECUTION

1. Construction will only commence once the Pre-Construction Submittals are

accepted and approved by the Contracting Officer Representative.

2. A Notice to Proceed will be issued to the Contractor.

3.2 PREPARATION / PROTECTION OF WORK AREA

1. Construction shall not disturb or damage any property.

2. Contractor to fence off area where construction is to take place.

3.3 EQUIPMENT

1. The Contractor shall provide all necessary plant and equipment necessary to

complete the tendered project.

2. The Contractor is responsible for the control of equipment to and from site.



3.4.1 TECHNICAL SPECIFICATION

1. NOTICES

A. NOTICES TO AUTHORITIES:

Contractor to ensure all inspections are carried out by City of Windhoek at

intervals as follows:

a. Notice that uncovered drains are ready for inspection.

d. Notice that drains are ready for final inspection.

2. GENERAL ALTERATION NOTES

A. ALTERATIONS:

1. Damage to remaining portions

Prevent as far as possible structural or other damage to remaining portions of

the building. Make good all existing work damaged during alterations.

3. EARTHWORKS

A. SITE CLEARANCE:

1. Demolitions

Remove all material and rubble within one meter of the perimeter of the

building, including floors, screen walls, services and manholes, down to 150

mm below ground level.

2. Dust and noise

Use methods that keep dust, noise and vibration to acceptable levels, and

which leave adjoining structures safe, to the approval of the local authority.

3. Trees, etc.

Remove trees and shrubs, vegetable matter, rubble garbage, wire fences etc,

all as shown on drawings or as directed by the architect/principal agent.



Remove tree roots where these occur under buildings or paving under

construction. Fill stump holes with approved filling material.

Protect trees to be preserved.

4. Cleaning site at completion

At completion of the works, dig up concrete or mortar mixing platforms, and

clean the site of all surface and buried rubble.

B. EXCAVATIONS:

1. Storm water and ground water

Protect excavations against flooding by storm water.

C. FILLING:

1. Filling material

a. Use approved clean earth or gravel without clay or organic matter for

general filling work under floors.

b. Use hardcore consisting of broken stone, brick or concrete ranging in

size from 25 to 75 mm, well consolidated by ramming, under floors.

2. Blinding material

Use sufficient sand, fine gravel or other approved fine material to fill voids and

provide a close smooth surface of:

a. Hardcore which is to receive concrete.

b. Surfaces which are to receive damp proof membranes.

D. TERMITE CONTROL:

1. Soil poisoning

Poison the soil against the inside of foundation walls and under floors as

specified in the Bill of Quantities.

a. By a certified pest control contractor.

b. Not when soil is excessively wet.

c. Do not disturb treated surface.

d. Treat foundation trench bottoms before casting.

e. Treat every 300 mm backfill before compaction.

f. Treat full length of pipe and cable trenches inside the building and for a

distance of 3 m outside the building.

g. Take necessary health precautions on site.



4. CONCRETE, FORMWORK AND REINFORCEMENT

A. MASS CONCRETE:

1. Cement

Cement must comply with strength class 32.5.

Keep bagged cement in a dry store. Always use the oldest cement first. Do

not use bagged cement with lumps that cannot be crumbled by hand.

2. Aggregates

Natural of crushed sand for use in concrete must comply with SABS 1083.

Stone for use in concrete must comply with SABS 1083.

3. Water

Water must be clean and free from injurious amounts of acids, alkalis, organic

matter, and other substances that could impair the strength or durability of

concrete. Have water tested if in doubt.

4. Concrete mix

a. Mix cement, sand and stone by volume or by mass to produce the

specified compressive strength at 28 days.

b. Mix proportions may be arrived at by a process of mix design, by the

use of recognized tables, or according to the cement manufacturer’s

instructions.

c. Mixing of concrete may be done by hand or by machine.

d. Add just enough water to produce a workable consistence, as

measured by the standard slump test.

5. Testing

3 Test cubes are required per foundation batch as well as per floor batch.

These test cubes tested for compressive strength by an approved laboratory.

6. Notice

Give timely notice to the architect before casting of concrete is to commence.

7. Paving

Use 20 MPa concrete. Cast paving to thicknesses as specified.

Cast paving with a minimum fall of 1:100. Brush the surface, after the concrete

has stiffened sufficiently, with a stiff brush or similar to leave a coarse surface.

Prepare a sample pane for approval.

Form construction joints, at 3,5 m maximum centers in both directions. Round

off edges of panes.



5. PRECAST CONCRETE

A. PRECAST PRESTRESSED CONCRETE LINTELS:

1. Lintels

Lintels for exposed work must be uniform in colour and texture, and free from

imperfections.

2. Laying lintels

Lay lintels with a bearing length of at least 200 mm in 1:5 cement mortar. Prop

lintels at 1,5 m centers for at least seven days after brickwork has been

completed.

6. MASONRY

A. BRICKS AND BLOCKS:

1. Concrete bricks

a. Colour, size, profile and surface texture to be of good quality.

b. Compressive strength: 3,5 MPa for general single-storey work.

2. Proof of quality

Dispatch or consignment notes of bricks and blocks delivered to site must state

the specified requirements and must be kept or shown when requested by die

architect.

3. Storage

Unload bricks and blocks carefully to prevent chipping and breakage. Stack on

prepared level areas and protect from staining or marking.

B. MORTAR:

1. Cement

Common cement must be strength class 32,5.

2. Sand

a. Natural or crusher sand for mortar to comply with SABS 1090.

b. Obtain sand from one source throughout the duration of the works.

c. Store sand in a way that will avoid contamination by foreign or matter.

This includes organic matter.

3. Mixing

Mix ingredients dry on a clean surface of by means of a mechanical mixer.



Mix thoroughly until colour is uniform. Add water to give the desired plasticity

and note that mixture should be used within 2 hours.

C. BRICKWORK:

1. Bond

a. Use full bricks wherever possible.

b. Build common brickwork in stretcher bond.

2. Laying bricks and blocks:

a. Lay bricks on a full bed of mortar.

b. Rake out joints 10 mm deep.

7. WATERPROOFING

A. DAMP-PROOF COURSES AND MEMBRANES:

1. Polyolefin damp-proof membrane

0,25 mm smooth green polyolefin membrane or similar and approved to be laid

under concrete surface beds or concrete floors.

2. Joint Fillers/Sealants

Material:

a. Polysulphide sealants must be two-part gun-grade polysulphide.

b. Silicone rubber sealant for building joints must be one part low modulus

silicone rubber sealant.

8. ALUMINIUM DOORS & WINDOWS

A. DOORS & WINDOWS

1. Glazed aluminium windows and residential sliding doors

a. Glazed aluminium alloy windows and sliding doors for external use must

comply with SABS 1651 and be of type and dimension, handing, finish,

type and quality of glass, colour of gaskets and weatherstrips, material

and finish of hardware, insect screens, whether weatherstrips are to be

renewable, additional security deviceses and performance class as

specified.

2. Aluminium and finish

a. Aluminium extrusions must be alloy 6063 or 6261 in temper T5 or T6 to

comply with BS 1474. Aluminium sheet must be alloy 1200 or 3004 or

5251 of appropriate temper to comply with BS1470.



3. Glass

a. Glass must be of type, thickness and colour as specified.

4. Manufacture

a. Aluminium framed windows and doors must be manufactured according

to the minimum requirements of the Association of Architectural

Aluminium Manufacturers of South Africa (AAAMSA).

b. Each window and door must be marked with the mark and number of

the test certificate issued by AAAMSA, or a copy of the latest

performance test certificate for similar products must be provided.

c. The supplier is responsible for confirmation of opening sizes.

d. Frame parts must be joined by mechanical means or by welding. Joints

may have flush, stepped or lapped surfaces. Mitred joints may only be

flush. All joints must be sealed. Contact between incompatible

materials is not allowed.

e. Accessories must be removable without having to remove the frames

from the structure. Sliding memebers must be fitted so that no metal to

metal sliding contact occurs.

f. Sealants must be compatible with aluminium, and fitted so that the

performance of the sliding or swinging parts is not impaired by their

deterioration.

g. Glazing beads, gaskets and glazing compounds must be compatible

with the aluminium, its finish and with the glass. No putty is permitted.

h. Hardware and fittings must be resisitant to atmospheric corrosion and

be accessible for adjustment, repair and replacement after the window

or door has been installed.

i. Fastenings must be compatible with aluminium and its finishes.

5. Installation

a. Build in approved subframes if so specified.

b. Fit windows at the last possible stage in the building process to prevent

damage and staining of the aluminium frames.

c. Protect frames against impact or scratching by wrapping with paper or plastic

or covering with a light tack tape, and leave these wrappings in place until all

rough trades are finished.

d. Use fixings of aluminium or 304 grade stainless steel.

e. Avoid direct contact between aluminium and other metals or wet concrete by

applying a separating coat of bituminous paint.

f. Install the window or door secure, sealed and undamaged.

g. Scratches and blemishes shall be viewed for inspection at a distance of three

metres under normal and reasonable lighting conditions.



9. CEILING STRUCTURE

A. TIMBER CEILING BRANDERING:

1. Size and spacing

Sizes of brandering for 6,4 mm gypsum board must be:

a. 38 x 38 mm softwood for roof truss spacing up to 1000 mm.

2. Fixing

Nail brandering with staggered end joints at right angles with roof trusses and

at centers recommended by the manufacturer of the ceiling boards, and at 38

mm centers away from walls for the fixing of cornices, with 75 – 100 mm wire

nails or clout nails.

B. GYPSUM CEILINGS:

1. Boards

Store boards on an even surface under cover and keep dry.

2. Fixing

a. Install ceiling boards strictly according to the manufacturer’s

instructions. Upon request of the Architect, furnish written proof that the

manufacturer has been consulted.

b. Use longest lengths possible to suit room. Arrange boards

symmetrically about room, at right angles to timber brandering, with cut

boards symmetrically about room, at right angles to timber brandering,

with cut boards along walls, and to approved pattern.

c. Ensure building is enclosed before ceiling boards are fixed.

d. Fix wire scrim of self-adhesive brown paper tape over all joints

e. plaster the entire ceiling with 3-6 mm lightweight hemi-hydrate gypsum

plaster the same day as the board has been erected. Finish plaster to a

smooth polished surface.

C. CORNICES:

1. Material and fixing

a. Cornices must be 75 mm wide coved gypsum cornice.

b. Nail cornices to brandering with 38 mm galvanized clout nails at 300

mm maximum centers.

c. Nail cornices to walls with 38 mm hardened steel nails, or glue gypsum

or fiber-cement cornices to walls with approved contact adhesive, or 3-4

mm gypsum plaster.



D. CEILING HATCH:

1. Timber hatch

a. Trim 650 x 650mm minimum clear opening in ceiling with 38 x 100mm

trimmers spiked to beams or trusses.

b. Form hatch frame of brandering as for ceiling.

c. Form trap door of brandering and ceiling board as for ceiling.

d. Hang trap door with one pair 75 mm steel hinges screwed to frame, so

that trap door can open 180 degrees on to top of ceiling brandering into

roof space.

e. Provide 50 x 19 mm fillets nailed or screwed to ceiling around hatch

opening, to carry trap door in closed position. Mitre corners of fillets.

10. IRONMONGERY

A. IRONMONGERY:

1. Locks, latches, handles, plates, closers etc

a. Locks, latches, handles, plates, closers etc. must be as specified.

b. Fix all ironmongery with matching screws. Ease and adjust locks on

completion.

2. Plastic number/name plates, safety signs

a. Plastic number or name plates, and safety signs, must be of colour, size

and height of letter as specified.

b. Screw plates and signs to walls, doors, etc. in an approved manner.

11. PLASTER

A. PLASTER FINISH:

1. Cement

a. Cement must be common cement to strength class 32,5.

b. Type, composition and strength of the cement must be shown on the

bag or the delivery slip of bulk cement. Bags must be SABS-mark

bearing.

c. Keep bagged cement in a dry store. Always use the oldest cement first.

Do not use bagged cement with lumps that cannot be crumbled by

hand.

2. Sand

Natural or crusher sand for plaster must be of fineness modulus as specified,

when relevant.



3. Preparation

a. Complete all chased pipework and service outlets before plastering is

commenced.

b. Ensure that the surface to be plastered does not deviate from the

required plane by more than about 10 mm.

c. Roughen concrete surfaces where necessary by hacking, and clean the

surface with a wire brush.

d. In case the surface is very dense and non-absolvent, eg. hard burnt

bricks or dense concrete, wet and slush with 1:1 cement sand grout to

for a key for the plaster.

4. Plastering

a. Apply one coat plaster to surface, leave to stiffen, strike off with a striker

board, and wood float to an even surface, thickness of 10–15mm.

b. If plaster is to be applied in two coats, or is to be tiled, the first coat must

be scored with roughly parallel lines about 20 mm apart and 5 mm deep

to provide a key for the finishing coat or the tile adhesive.

c. Cement-sand finishing coats must be 5-8 mm thick.

d. Finish plaster with a wooden trowel, to an even and smooth finish.

e. Protect surfaces against drying out for three days.

f. Form knife joints through full plaster thickness over movement joints

and along the line of the damp proof course at floor level, with arris-

rounded edges.

5. Accuracy

Permissible deviation of plaster work is 3mm.

12. TILING

A. FLOOR AND WALL TILES:

1. Porcelain floor and wall tiles

Porcelain floor and wall tiles must be glazed and of size, shape and colour as

specified on the drawings.

2. Adhesive

Adhesive must be of approved type, suitable for the tiling work at hand.

Provide the architect/principal agent of copies of relevant product literature

before any adhesive is purchased.



3. Preparation

a. Complete all adjacent rough construction work and install and test all

services in the background before commencing tiling work.

b. Use only personnel experienced in this type of work

c. Examine backgrounds, remedy defects and allow drying to equilibrium.

d. Roughen surface of backgrounds if not rough enough to provide a

satisfactory bond, or wet and slush with a 1:2 cement: coarse sand mix,

or apply a bonding agent.

4. Fixing tiles

Fix tiles in adhesive strictly according to the manufacturer’s instructions.

5. Pattern

a. Fix tiles with straight joints in both directions, or in agreed pattern.

b. Cut tiles only along sides of wall panels and along floors.

c. The top row of wall tiles must be a full tile or a border tile as specified.

6. Grouting and pointing

a. Grout joints of width less than 3 mm; point wider than joints

b. If proprietary grout mixes are used, apply according to the

manufacturer’s instructions.

c. Grout of point tiles fixed in adhesive after a time recommended by the

manufacturer of the adhesive.

d. Grouting: Dampen joints and apply cement grout with a brush. Work

the grout into the joints with a squeegee until joints are filled flush with

the surface. Before grout hardens, pencil in the joints with a piece of

wood or tool of width the same as that of the joint.

e. Pointing: Dampen joints and fill with cement: sand mortar with a

pointing tool. Before mortar hardens, tool the joints the required finish.

7. Movement joints

Form 6 mm wide movement joints in tiling and trough the full depth of the

bedding coat:

a. Over movement joints in the background.

b. At ceiling level.

c. Vertically and horizontally at approximately 4,5 m centers

d. Where tiling is continuous over different backgrounds.

e. Fill joints with sealant of approved type.

Use patent aluminium movement joint strips with synthetic rubber inserts for

joints in floors. Fix strips through pre-drilled holes using stainless steel screws

and plugs at 300 mm centers on both sides of joint.



8. Cleaning

Sponge the tiled surface with water and polish the tiled surface with a clean dry

cloth. Do not use acid cleaners, scouring powder or abrasive cleaning

materials.

13. SANITARY APPLIANCES

A. APPLIANCES:

1. Appliances

Sanitary appliances must be of shape, size, colour, type, capacity and with

accessories as specified.

2. Taps

Water taps and stopcocks must be as specified. Taps for cold and hot water

must be marked blue and red respectively with plastic inserts.

3. Toilet roll holders, towel rails

Toilet roll holders must be as specified.

B. FIXING OF SANITARY FITTINGS GENERALLY:

1. Leave protective wrappings in position for as long as possible.

2. Fix in a manner that will facilitate future removal if necessary.

3. Fix all appliances securely. Use manufacturers’ brackets and fixing methods

wherever possible. Use frame fixing anchors for fixing brackets. Do not screw

and plug.

14. ELECTRICIAN

A. ELECTRICAL INSTALLATION:

1. Electrical Installation

a. Comply with all requirements of the local authority.

b. All work must be done under supervision of a registered electrician.

c. Chase neatly. Do not chase walls constructed of hollow blocks.

d. Chase solid walls not deeper than one third of the wall thickness

vertically and not more than one sixth horizontally.

e. Fill chases with class 1 or 2 mortar once the conduits are in position.



2. Guarantee

Guarantee the efficient and safe working of the whole installation for 12 months

after completion of the building. Lighting bulbs and tubes are excluded from

this guarantee.

3. Qualifications

All electrical work to be done by a qualified electrician. Paperwork to be

provided as proof.

B. MATERIALS:

1. Conduits

Conduits must be uPVC conduits.

Fix conduits as follows:

a. Build in conduits in wall chases with cement mortar and clamps.

b. Fix conduits on wall surfaces and in roof spaces with clamps.

c. Cast conduits in concrete surface beds.

d. Do surface fixing level, plumb, neatly and in straight line.

2. Distribution

Electrical distribution boards must be of pre-painted (to approved colour)

pressed steel with door and latch, with isolator, earth leakage devices and

circuit breakers.

15. GLAZING

A. GLAZING APPLICATIONS:

1. Mirrors

Mirrors must be one of the following:

a. Silvered float glass mirrors with chamfered and polished edges.

b. 0,9 mm Thick bright annealed stainless steel.

Fasten glass mirrors with chromium plated mirror screws to wall and allow 3

mm air space at back for ventilation, or fix mirrors with vertical strips of double

sided tape to allow for ventilation.

Fasten stainless steel mirrors by screws and/or glue in an approved manner.



16. PAINTING

A. GENERAL REQUIREMENTS:

1. Paint

a. All containers must reach the site unopened.

b. The complete paint system primer, undercoat and finishing coat – must

be as recommended by the same manufacturer.

2. Preparation

a. Clean all surfaces before painting.

b. When so directed by the architect, remove ironmongery, light fittings

and other removable fittings that can be contaminated. Mark, store and

re-fix after completion.

c. Seal cracks between frames, skirting, cornices etc. and walls with

paintable acrylic sealant.

d. Protect surfaces not to be painted.

3. Colours

a. The colours of undercoats must match the finishing coat closely but with

enough difference to be able to distinguish between all coats.

b. Prepare colour samples of all finishing coats for approval before any

bulk paint is purchased.

4. Painting in general

a. Sandpaper all coats of paint and leave time to dry before the next coat

is applied.

b. Do not paint when conditions are unsuitable, for example dust,

insufficient light, direct sunlight or inclement weather.

c. Spray-paint only where this is the accepted method. Mask all

surrounding surfaces when spray painting.

END OF SCOPE OF WORKS



ADDENDUM A

GENERAL ITEMS AND PROCEDURES



ADDENDUM B

BILL OF QUANTITIES



ADDENDUM C

DRAWINGS

U.S. Embassy Windhoek, Namibia - State · U.S. Embassy Windhoek, Namibia Project Number: ......

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